HomeMy WebLinkAboutFISCHER PROPERTIES - PDP220007 - SUBMITTAL DOCUMENTS - ROUND 2 - DRAINAGE REPORT
PRELIMINARY DRAINAGE REPORT
FISCHER PROPERTIES
FORT COLLINS, COLORADO
AUGUST 24, 2022
NORTHERNENGINEERING.COM
970.221.4158
FORT COLLINS
GREELEY
This Drainage Report is consciously provided as a PDF.
Please consider the environment before printing this document in its entirety.
When a hard copy is necessary, we recommend double-sided printing.
NORTHERNENGINEERING.COM |
970.221.4158
FORT COLLINS | GREELEY
PRELIMINARY DRAINAGE REPORT: FISCHER PROPERTIES
COVER SHEET
August 24, 2022
City of Fort Collins
Stormwater Utility
700 Wood Street
Fort Collins, CO 80521
RE: PRELIMINARY DRAINAGE REPORT FOR
FISCHER PROPERTIES
Dear Staff,
Northern Engineering is pleased to submit this Preliminary Drainage Report for your review.
This report accompanies the Preliminary Development Plan submittal for the proposed Fischer
Properties.
This report has been prepared in accordance with the Fort Collins Stormwater Criteria Manual
(FCSCM) and serves to document the stormwater impacts associated with the proposed Fischer
Properties project. We understand that review by the City of Fort Collins is to assure general
compliance with standardized criteria contained in the FCSCM.
If you should have any questions as you review this report, please feel free to contact us.
Sincerely,
NORTHERN ENGINEERING SERVICES, INC.
Adam Boese, PE Stephanie Thomas, PE
Project Engineer Project Manager
Compliance Statement
I hereby attest that this report for the Preliminary drainage design for Fischer Properties was
prepared by me or under my direct supervision, in accordance with the provisions of the Fort
Collins Stormwater Criteria Manual. I understand that the City of Fort Collins does not and will
not assume liability for drainage facilities designed by others.
NORTHERNENGINEERING.COM |
970.221.4158
FORT COLLINS | GREELEY
PRELIMINARY DRAINAGE REPORT: FISCHER PROPERTIES
TABLE OF CONTENTS
TABLE OF CONTENTS
TABLES AND FIGURES
APPENDICES
APPENDIX A – HYDROLOGIC COMPUTATIONS
APPENDIX B – HYDRAULIC COMPUTATIONS
APPENDIX C – WATER QUALITY / LID EXHIBIT
APPENDIX D – EROSION CONTROL REPORT
APPENDIX E – USDA SOILS REPORT
APPENDIX F – FEMA FIRMETTE
MAP POCKET
C 700 – HISTORIC DRAINAGE EXHIBIT
C 701 – DRAINAGE EXHIBIT
NORTHERNENGINEERING.COM |
970.221.4158
FORT COLLINS | GREELEY
PRELIMINARY DRAINAGE REPORT: FISCHER PROPERTIES
4 | 11
NORTHERNENGINEERING.COM |
970.221.4158
FORT COLLINS | GREELEY
PRELIMINARY DRAINAGE REPORT: FISCHER PROPERTIES
5 | 11
NORTHERNENGINEERING.COM |
970.221.4158
FORT COLLINS | GREELEY
PRELIMINARY DRAINAGE REPORT: FISCHER PROPERTIES
6 | 11
NORTHERNENGINEERING.COM |
970.221.4158
FORT COLLINS | GREELEY
PRELIMINARY DRAINAGE REPORT: FISCHER PROPERTIES
7 | 11
Step 4 – Implement Site Specific and Other Source Control BMPs. This step typically applies to
industrial and commercial developments.
NORTHERNENGINEERING.COM |
970.221.4158
FORT COLLINS | GREELEY
PRELIMINARY DRAINAGE REPORT: FISCHER PROPERTIES
8 | 11
Rational Flow Summary | Developed Basin Flow Rates
BASIN
TOTAL
AREA
(acres) Tc2
(min)
Tc100
(min)
C2 C100 Q2
(cfs)
Q100
(cfs)
H1 2.74 12.8 12.8 0.39 0.46 2.15 8.88
H2 2.65 12.6 12.6 0.25 0.31 1.34 5.79
Offsite Basins
OS-1 0.13 5.0 5.0 0.81 0.86 0.31 1.13
OS-2 0.52 10.8 10.8 0.44 0.50 0.49 1.96
OS-3 0.40 8.8 8.8 0.43 0.49 0.40 1.60
OS-4 0.93 10.4 10.4 0.33 0.39 0.68 2.79
NORTHERNENGINEERING.COM |
970.221.4158
FORT COLLINS | GREELEY
PRELIMINARY DRAINAGE REPORT: FISCHER PROPERTIES
9 | 11
NORTHERNENGINEERING.COM |
970.221.4158
FORT COLLINS | GREELEY
PRELIMINARY DRAINAGE REPORT: FISCHER PROPERTIES
10 | 11
Rational Flow Summary | Developed Basin Flow Rates
BASIN
TOTAL
AREA
(acres) Tc2
(min)
Tc100
(min)
C2 C100 Q2
(cfs)
Q100
(cfs)
100 0.60 6.9 6.9 0.63 0.69 0.99 3.76
200 1.83 5.0 5.0 0.83 0.89 4.33 16.20
300 2.64 6.5 6.5 0.61 0.70 4.18 16.74
OF-1 0.23 7.4 7.4 0.33 0.39 0.19 0.77
OF-2 0.04 5.0 5.0 0.70 0.75 0.08 0.31
OS-1 0.13 5.0 5.0 0.81 0.86 0.31 1.13
OS-2 0.52 10.8 10.8 0.44 0.50 0.49 1.96
OS-3 0.40 8.8 8.8 0.43 0.49 0.40 1.60
OS-4 0.93 10.4 10.4 0.33 0.39 0.68 2.79
Water Quality Concept
Rain Gardens/Underground Chambers
1.
NORTHERNENGINEERING.COM |
970.221.4158
FORT COLLINS | GREELEY
PRELIMINARY DRAINAGE REPORT: FISCHER PROPERTIES
11 | 11
1.
LID Site Summary - New Impervious Area
Total Area of Current Development 232,598 ft2
Total On-site Impervious Area 143,631 ft2
75% Required Minimum Area to be Treated by LID 107,723 ft2
Total On-site Impervious Area Treated by LID 127,813 ft2
Percent On-site Impervious Treated by LID 88.99%
Additional Off-site Impervious Area Treated by LID 9,176 ft2
Percent Total Impervious Area Treated by LID 95.38%
Total Impervious Area Treated by Traditional WQ 13,385 ft2
Percent Impervious Treated by Traditional Water Quality 9.32%
Percent Impervious Area Treated by Traditional WQ or LID 104.70%
Pond ID
Extended
Detention
WQCV (CF)
LID WQCV
(CF)
100-Yr.
Detention Vol.
(CF)
Total
Volume (CF)
100-Yr.
Detention
WSEL(Ft)
Peak Release
(cfs)
Pond 1 546.00 N/A 2,832.00 3,378.00 5,030.03 0.40
Pond 2 N/A 2,209.00 9,843.00 12,052.00 5,029.40 1.99
Pond 3 N/A 2,213.00 16,562.00 18,775.00 5,031.27 1.10
NORTHERNENGINEERING.COM |
970.221.4158
FORT COLLINS | GREELEY
PRELIMINARY DRAINAGE REPORT: FISCHER PROPERTIES
12 | 11
NORTHERNENGINEERING.COM |
970.221.4158
FORT COLLINS | GREELEY
PRELIMINARY DRAINAGE REPORT: FISCHER PROPERTIES
13 | 11
NORTHERNENGINEERING.COM | 970.221.4158
FORT COLLINS | GREELEY
PRELIMINARY DRAINAGE REPORT: FISCHER PROPERTIES
APPENDIX
APPENDIX A
HYDROLOGIC COMPUTATIONS
CHARACTER OF SURFACE1:
Percentage
Impervious
2-yr Runoff
Coefficient
10-yr Runoff
Coefficient
100-yr Runoff
Coefficient
Developed
Asphalt .…………………………..……………………………………………….…………………………..……………………………………………….…………………………..……………………………………………….…………………………..………………………………………………100%0.95 0.95 1.00
Concrete .…………………………..……………………………………………….…………………………..……………………………………………….…………………………..……………………………………………….…………………………..………………………………………………100%0.95 0.95 1.00
Rooftop .…………………………..……………………………………………….…………………………..……………………………………………….…………………………..……………………………………………….…………………………..………………………………………………90%0.95 0.95 1.00
Gravel .…………………………..……………………………………………….…………………………..……………………………………………….…………………………..……………………………………………….…………………………..………………………………………………40%0.50 0.50 0.63
Pavers .…………………………..……………………………………………….…………………………..……………………………………………….…………………………..……………………………………………….…………………………..………………………………………………40%0.50 0.50 0.63
Residential (Low Density).…………………………..……………………………………………….…………………………..……………………………………………….…………………………..……………………………………………….…………………………..………………………………………………50%0.55 0.55 0.69
Landscape or Pervious Surface
Playgrounds .…………………………..……………………………………………….…………………………..……………………………………………….…………………………..……………………………………………….…………………………..………………………………………………25%0.35 0.35 0.44
Lawns Clayey Soil .…………………………..……………………………………………….…………………………..……………………………………………….…………………………..……………………………………………….…………………………..………………………………………………2%0.25 0.25 0.31
Lawns Sandy Soil .…………………………..……………………………………………….…………………………..……………………………………………….…………………………..……………………………………………….…………………………..……………………………………………….…………………………..……………………………………………….…………………………..………………………………………………2%0.15 0.15 0.19
Notes:
Basin ID Basin Area
(ac)
Area of
Asphalt/Con
crete
(ac)
Area of
Concrete
(ac)
Area of
Rooftop
(ac)
Area of Single
Family (ac)
Area of
Gravel
(ac)
Area of
Pavers
(ac)
Area of
Playgrounds
(ac)
Area of Lawns
(ac)
Composite
% Imperv.
2-year
Composite Runoff
Coefficient
10-year
Composite
Runoff
Coefficient
100-year
Composite
Runoff
Coefficient
H1 2.742 0.00 0.06 0.26 0.28 0.00 0.00 2.49 17% 0.39 0.39 0.46
H2 2.653 0.00 0.00 0.00 0.00 0.00 0.00 2.65 2% 0.25 0.25 0.31
OS-1 0.133 0.105 0.03 80% 0.81 0.81 0.86
OS-2 0.518 0.141 0.38 26% 0.44 0.44 0.50
OS-3 0.397 0.00 0.097 0.30 25% 0.43 0.43 0.49
OS-4 0.928 0.01 0.095 0.82 12% 0.33 0.33 0.39
EXISTING CONDITION BASIN % IMPERVIOUSNESS AND RUNOFF COEFFICIENT CALCULATIONS
2) Runoff Coefficients are taken from the Fort Collins Stormwater Criteria Manual, Chapter 3. Table 3.2-1 and 3.2-2
1) Percentage impervious taken from the Fort Collins Stormwater Criteria Manual, Chapter 5, Table 4.1-2 and Table 4.1-3
Offsite Basins
Overland Flow, Time of Concentration:
Channelized Flow, Time of Concentration:
Total Time of Concentration :
T c is the lesser of the values of Tc calculated using T c = T i + T t
C2 C100
Length,
L
(ft)
Slope,
S
(%)
Ti2 Ti100
Length,
L
(ft)
Slope,
S
(%)
Roughness
Coefficient
Assumed
Hydraulic
Radius
Velocity,
V
(ft/s)
Tt
(min)Tc (Eq. 3.3-5) Tc2 = Ti +Tt Tc100 = Ti +Tt Tc2 Tc100
h1 H1 0.39 0.46 300 1.28%21.2 19.1 208 1.04%0.015 0.59 7.14 0.5 12.8 21.7 19.6 12.8 12.8
h2 H2 0.25 0.31 300 2.27%20.9 19.5 176 1.77%0.015 0.59 9.29 0.3 12.6 21.3 19.8 12.6 12.6
os-1 OS-1 0.81 0.86 49 1.65%3.2 2.7 129 2.32%0.015 0.59 10.64 0.2 11.0 3.4 2.9 5.0 5.0
os-2 OS-2 0.44 0.50 143 1.07%14.4 13.1 N/A 0.015 0.59 N/A N/A 10.8 14.4 13.1 10.8 10.8
os-3 OS-3 0.43 0.49 139 3.58%9.7 8.8 N/A 0.015 0.59 N/A N/A 10.8 9.7 8.8 9.7 8.8
os-4 OS-4 0.33 0.39 100 2.06%11.3 10.4 N/A 0.038 0.50 N/A N/A 10.6 11.3 10.4 10.6 10.4
Offsite Basins
EXISTING CONDITION DIRECT TIME OF CONCENTRATION
Channelized Flow
Design
Point Basin
Overland Flow Time of Concentration
Frequency Adjustment Factor:
(Equation 3.3-2 FCSCM)
(Equation 5-5 FCSCM)
(Equation 5-4 FCSCM)
(Equation 3.3-5 FCSCM)
Table 3.2-3 FCSCM
Therefore Tc2=Tc10 Notes:
1) Add 5000 to all elevations.
2) Per Fort Collins Stormwater Manual, minimum Tc = 5 min.
3) Assume a water depth of 6" and a typical curb and gutter per Larimer County
Urban Street Standard Detail 701 for curb and gutter channelized flow. Assume a
water depth of 1', fixed side slopes, and a triangular swale section for grass
channelized flow. Assume a water depth of 1', 4:1 side slopes, and a 2' wide valley
pan for channelized flow in a valley pan.
Rational Method Equation:
Rainfall Intensity:
h1 H1 2.74 12.8 12.8 0.39 0.46 2.02 3.45 7.04 2.15 3.68 8.88
h2 H2 2.65 12.6 12.6 0.25 0.31 2.02 2.02 7.04 1.34 1.34 5.79
os-1 OS-1 0.13 5.0 5.0 0.81 0.86 2.85 2.85 9.95 0.31 0.31 1.13
os-2 OS-2 0.52 10.8 10.8 0.44 0.50 2.17 2.17 7.57 0.49 0.49 1.96
os-3 OS-3 0.40 8.8 8.8 0.43 0.49 2.35 2.35 8.21 0.40 0.40 1.60
os-4 OS-4 0.93 10.4 10.4 0.33 0.39 2.21 2.21 7.72 0.68 0.68 2.79
EXISTING CONDITION RUNOFF COMPUTATIONS
Design
Point Basin(s)Area, A
(acres)
Tc2
(min)
Flow,
Q2
(cfs)
Flow,
Q100
(cfs)
C2 C100
IDF Table for Rational Method - Table 3.4-1 FCSCM
Intensity,
i10
(in/hr)
Flow,
Q10
(cfs)
Tc100
(min)
Intensity,
i2
(in/hr)
Intensity,
i100
(in/hr)
Offsite Basins
()()()AiCCQf=
CHARACTER OF SURFACE1: Percentage
Impervious
2-yr Runoff
Coefficient
10-yr Runoff
Coefficient
100-yr Runoff
Coefficient
Developed
Asphalt .…………………………..……………………………………………….…………………………..……………………………………………….…………………………..……………………………………………….…………………………..………………………………………………100%0.95 0.95 1.00
Concrete .…………………………..……………………………………………….…………………………..……………………………………………….…………………………..……………………………………………….…………………………..………………………………………………100%0.95 0.95 1.00
Rooftop .…………………………..……………………………………………….…………………………..……………………………………………….…………………………..……………………………………………….…………………………..………………………………………………90%0.95 0.95 1.00
Gravel .…………………………..……………………………………………….…………………………..……………………………………………….…………………………..……………………………………………….…………………………..………………………………………………40%0.50 0.50 0.63
Pavers .…………………………..……………………………………………….…………………………..……………………………………………….…………………………..……………………………………………….…………………………..………………………………………………40%0.50 0.50 0.63
Residential (Low Density).…………………………..……………………………………………….…………………………..……………………………………………….…………………………..……………………………………………….…………………………..………………………………………………50%0.55 0.55 0.69
Landscape or Pervious Surface
Playgrounds .…………………………..……………………………………………….…………………………..……………………………………………….…………………………..……………………………………………….…………………………..………………………………………………25%0.35 0.35 0.44
Lawns Clayey Soil .…………………………..……………………………………………….…………………………..……………………………………………….…………………………..……………………………………………….…………………………..………………………………………………2%0.25 0.25 0.31
Lawns Sandy Soil .…………………………..……………………………………………….…………………………..……………………………………………….…………………………..……………………………………………….…………………………..……………………………………………….…………………………..……………………………………………….…………………………..………………………………………………2%0.15 0.15 0.19
Notes:
Basin ID Basin Area
(ac)
Area of
Asphalt/Con
crete
(ac)
Area of
Concrete
(ac)
Area of
Rooftop
(ac)
Area of Single
Family (ac)
Area of
Gravel
(ac)
Area of
Pavers
(ac)
Area of
Playgrounds
(ac)
Area of Lawns
(ac)
Composite
% Imperv.
2-year
Composite Runoff
Coefficient
10-year
Composite
Runoff
Coefficient
100-year
Composite
Runoff
Coefficient
Notes
100 0.60 0.00 0.09 0.24 0.00 0.00 0.00 0.00 0.28 51%0.63 0.63 0.69 Detention Pond 1
200 1.83 0.57 0.43 0.52 0.00 0.00 0.00 0.00 0.30 81%0.83 0.83 0.89 Detention Pond 2
300 2.64 0.59 0.20 0.00 1.31 0.00 0.00 0.00 0.55 55%0.61 0.61 0.70 Detention Pond 3
OF-1 0.23 0.00 0.02 0.00 0.00 0.00 0.00 0.00 0.20 13%0.33 0.33 0.39
OF-2 0.04 0.02 0.01 0.00 0.00 0.00 0.00 0.00 0.02 64%0.70 0.70 0.75
Offsite Basins
OS-1 0.13 0.11 0.00 0.00 0.00 0.00 0.00 0.00 0.03 80%0.81 0.81 0.86
OS-2 0.52 0.00 0.00 0.14 0.00 0.00 0.00 0.00 0.38 26%0.44 0.44 0.50
OS-3 0.40 0.00 0.00 0.10 0.00 0.00 0.00 0.00 0.30 25%0.43 0.43 0.49
OS-4 0.93 0.00 0.01 0.09 0.00 0.00 0.00 0.00 0.82 12%0.33 0.33 0.39
Combined Basins
200, OS-4 2.76 0.57 0.44 0.62 0.00 0.00 0.00 0.00 1.12 58%0.67 0.67 0.72 Tributary Area to DP 200
300, OS-1, OS2, OS-3 3.69 0.69 0.20 0.24 1.31 0.00 0.00 0.00 1.25 48%0.57 0.57 0.66 Tributary Area to DP 300
OF-1, OF-2 0.27 0.02 0.03 0.00 0.00 0.00 0.00 0.00 0.22 21%0.38 0.38 0.44 Undetained Basins
300, OS-3 3.04 0.59 0.20 0.10 1.31 0.00 0.00 0.00 0.84 51%0.58 0.58 0.67 LID - Rain Garden
200, OS-4 2.76 0.57 0.44 0.62 0.00 0.00 0.00 0.00 1.12 58%0.67 0.67 0.72 LID - Underground Stormtech
Total On-Site 5.34 1.18 0.74 0.76 1.31 0.00 0.00 0.00 1.34 62%0.68 0.68 0.75
Total On-Site and Off-site 7.32 1.29 0.76 1.10 1.31 0.00 0.00 0.00 2.86 51%0.60 0.60 0.68
*The combined basins indicating tributary area to DP 200 and DP 300 provide the total area draining to these design points. These are not indicative of the total basin being detained in the Ponds 2 and 3
2) Runoff Coefficients are taken from the Fort Collins Stormwater Criteria Manual, Chapter 3. Table 3.2-1 and 3.2-2
1) Percentage impervious taken from the Fort Collins Stormwater Criteria Manual, Chapter 5, Table 4.1-2 and Table 4.1-3
DEVELOPED BASIN % IMPERVIOUSNESS AND RUNOFF COEFFICIENT CALCULATIONS
Overland Flow, Time of Concentration:
Channelized Flow, Time of Concentration:
Total Time of Concentration :
T c is the lesser of the values of Tc calculated using T c = T i + T t
C2 C100
Length,
L
(ft)
Slope,
S
(%)
Ti2 Ti100
Length,
L
(ft)
Slope,
S
(%)
Roughness
Coefficient
Assumed
Hydraulic
Radius
Velocity,
V
(ft/s)
Tt
(min)Tc (Eq. 3.3-5) Tc2 = Ti +Tt Tc100 = Ti +Tt Tc2 Tc100
100 100 0.63 0.69 59 1.05%6.6 5.8 396 0.74%0.015 0.59 6.01 1.1 12.5 7.7 6.9 7.7 6.9
200 200 0.83 0.89 69 4.35%2.6 3.0 334 0.74%0.015 0.59 6.00 0.9 12.2 3.5 3.9 5.0 5.0
300 300 0.61 0.70 129 3.21%7.1 5.8 457 1.95%0.015 0.59 9.76 0.8 13.3 7.8 6.5 7.8 6.5
OF OF-1 0.33 0.39 62 3.44%7.5 6.9 188 0.74%0.015 0.59 6.03 0.5 11.4 8.0 7.4 8.0 7.4
OF OF-2 0.70 0.75 25 3.52%2.5 2.2 370 0.70%0.015 0.59 5.86 1.1 12.2 3.5 3.2 5.0 5.0
os-1 OS-1 0.81 0.86 49 1.65%3.2 2.7 129 2.32%0.015 0.59 10.64 0.2 11.0 3.4 2.9 5.0 5.0
os-2 OS-2 0.44 0.50 143 1.07%14.4 13.1 0 N/A 0.015 0.59 N/A N/A 10.8 14.4 13.1 10.8 10.8
os-3 OS-3 0.43 0.49 139 3.58%9.7 8.8 0 N/A 0.015 0.59 N/A N/A 10.8 9.7 8.8 9.7 8.8
os-4 OS-4 0.33 0.39 100 2.06%11.3 10.4 0 N/A 0.038 0.50 N/A N/A 10.6 11.3 10.4 10.6 10.4
200 200, OS-4 0.67 0.72 177 2.34%8.1 7.1 434 1.44%0.015 0.59 8.39 0.9 13.4 8.9 8.0 8.9 8.0
300
300, OS-1, OS2,
OS-3 0.57 0.66 129 3.21% 7.6 6.3 457 1.95% 0.015 0.59 9.76 0.8 13.3 8.4 7.1 8.4 7.1
OF OF-1, OF-2 0.38 0.44 62 3.44%7.0 6.4 188 0.74%0.015 0.59 6.03 0.5 11.4 7.5 7.0 7.5 7.0
Combined Basins
DEVELOPED DIRECT TIME OF CONCENTRATION
Channelized Flow
Design
Point Basin
Overland Flow Time of Concentration
Frequency Adjustment Factor:
Offsite Basins
(Equation 3.3-2 FCSCM)
(Equation 5-5 FCSCM)
(Equation 5-4 FCSCM)
(Equation 3.3-5 FCSCM)
Table 3.2-3 FCSCM
Therefore Tc2=Tc10 Notes:
1) Add 5000 to all elevations.
2) Per Fort Collins Stormwater Manual, minimum Tc = 5 min.
3) Assume a water depth of 6" and a typical curb and gutter per Larimer County
Urban Street Standard Detail 701 for curb and gutter channelized flow. Assume a
water depth of 1', fixed side slopes, and a triangular swale section for grass
channelized flow. Assume a water depth of 1', 4:1 side slopes, and a 2' wide valley
pan for channelized flow in a valley pan.
Rational Method Equation:
Rainfall Intensity:
100 100 0.60 6.9 6.9 0.63 0.69 2.60 4.44 9.06 0.99 1.68 3.76
200 200 1.83 5.0 5.0 0.83 0.89 2.85 4.87 9.95 4.33 7.40 16.20
300 300 2.64 6.5 6.5 0.61 0.70 2.60 2.60 9.06 4.18 4.18 16.74
OF OF-1 0.23 7.4 7.4 0.33 0.39 2.52 2.52 8.80 0.19 0.19 0.77
OF OF-2 0.04 5.0 5.0 0.70 0.75 2.85 2.85 9.95 0.08 0.08 0.31
os-1 OS-1 0.13 5.0 5.0 0.81 0.86 2.85 2.85 9.95 0.31 0.31 1.13
os-2 OS-2 0.52 10.8 10.8 0.44 0.50 2.17 2.17 7.57 0.49 0.49 1.96
os-3 OS-3 0.40 8.8 8.8 0.43 0.49 2.35 2.35 8.21 0.40 0.40 1.60
os-4 OS-4 0.93 10.4 10.4 0.33 0.39 2.21 2.21 7.72 0.68 0.68 2.79
200 200, OS-4 2.76 8.0 8.0 0.67 0.72 2.46 2.46 8.59 4.54 4.54 17.05
300 300, OS-1, OS2, OS-3 3.69 7.1 7.1 0.57 0.66 2.52 2.52 8.80 5.30 5.30 21.42
OF OF-1, OF-2 0.27 7.0 7.0 0.38 0.44 2.60 2.60 9.06 0.26 0.26 1.06
Intensity,
i2
(in/hr)
Intensity,
i100
(in/hr)
Combined Basins
Offsite Basins
DEVELOPED RUNOFF COMPUTATIONS
Design
Point Basin(s)Area, A
(acres)
Tc2
(min)
Flow,
Q2
(cfs)
Flow,
Q100
(cfs)
C2 C100
IDF Table for Rational Method - Table 3.4-1 FCSCM
Intensity,
i10
(in/hr)
Flow,
Q10
(cfs)
Tc100
(min)
AiCCQf
Pond No :1
100
100-yr
0.69
5.00 min 2832 ft3
0.60 acres 0.07 ac-ft
Max Release Rate =0.40 cfs
Time (min)
Ft Collins
100-yr
Intensity
(in/hr)
Inflow
Volume
(ft3)
Outflow
Adjustment
Factor
Qav
(cfs)
Outflow Volume
(ft3)
Storage
Volume
(ft3)
5 9.950 1236 1.00 0.40 120 1116
10 7.720 1918 1.00 0.40 240 1678
15 6.520 2429 1.00 0.40 360 2069
20 5.600 2782 1.00 0.40 480 2302
25 4.980 3093 1.00 0.40 600 2493
30 4.520 3368 1.00 0.40 720 2648
35 4.080 3547 1.00 0.40 840 2707
40 3.740 3716 1.00 0.40 960 2756
45 3.460 3868 1.00 0.40 1080 2788
50 3.230 4012 1.00 0.40 1200 2812
55 3.030 4140 1.00 0.40 1320 2820
60 2.860 4263 1.00 0.40 1440 2823
65 2.720 4392 1.00 0.40 1560 2832
70 2.590 4503 1.00 0.40 1680 2823
75 2.480 4620 1.00 0.40 1800 2820
80 2.380 4730 1.00 0.40 1920 2810
85 2.290 4835 1.00 0.40 2040 2795
90 2.210 4941 1.00 0.40 2160 2781
95 2.130 5026 1.00 0.40 2280 2746
100 2.060 5117 1.00 0.40 2400 2717
105 2.000 5216 1.00 0.40 2520 2696
110 1.940 5301 1.00 0.40 2640 2661
115 1.890 5399 1.00 0.40 2760 2639
120 1.840 5485 1.00 0.40 2880 2605
*Note: Using the method described in Urban Storm Drainage Criteria Manual Volume 2.
A =
Tc =
Project Location :
Design Point
C =
Design Storm
DETENTION POND CALCULATION; MODIFIED FAA METHOD w/ Ft Collins IDF
Input Variables Results
Required Detention Volume
Fort Collins, CO
1382-002
Fischer Subdivision
Project Number :
Project Name :
8/23/2022
2:46 PM
1382-002_FAA_Pond 1.xls
FAA
Northern Engineering Services
Pond No :2
200
100-yr
0.89
5.00 min 9843 ft3
1.83 acres 0.23 ac-ft
Max Release Rate =1.99 cfs
Time (min)
Ft Collins
100-yr
Intensity
(in/hr)
Inflow
Volume
(ft3)
Outflow
Adjustment
Factor
Qav
(cfs)
Outflow Volume
(ft3)
Storage
Volume
(ft3)
5 9.950 4862 1.00 1.99 597 4265
10 7.720 7544 1.00 1.99 1194 6350
15 6.520 9557 1.00 1.99 1791 7766
20 5.600 10945 1.00 1.99 2388 8557
25 4.980 12166 1.00 1.99 2985 9181
30 4.520 13251 1.00 1.99 3582 9669
35 4.080 13955 1.00 1.99 4179 9776
40 3.740 14619 1.00 1.99 4776 9843
45 3.460 15215 1.00 1.99 5373 9842
50 3.230 15782 1.00 1.99 5970 9812
55 3.030 16285 1.00 1.99 6567 9718
60 2.860 16769 1.00 1.99 7164 9605
65 2.720 17277 1.00 1.99 7761 9516
70 2.590 17717 1.00 1.99 8358 9359
75 2.480 18176 1.00 1.99 8955 9221
80 2.380 18606 1.00 1.99 9552 9054
85 2.290 19022 1.00 1.99 10149 8873
90 2.210 19437 1.00 1.99 10746 8691
95 2.130 19774 1.00 1.99 11343 8431
100 2.060 20131 1.00 1.99 11940 8191
105 2.000 20522 1.00 1.99 12537 7985
110 1.940 20854 1.00 1.99 13134 7720
115 1.890 21240 1.00 1.99 13731 7509
120 1.840 21577 1.00 1.99 14328 7249
*Note: Using the method described in Urban Storm Drainage Criteria Manual Volume 2.
DETENTION POND CALCULATION; MODIFIED FAA METHOD w/ Ft Collins IDF
Input Variables Results
Required Detention Volume
Fort Collins, CO
1382-002
Fischer Subdivision
Project Number :
Project Name :
A =
Tc =
Project Location :
Design Point
C =
Design Storm
8/23/2022
2:49 PM
1382-002_FAA_Pond 2.xls
FAA
Northern Engineering Services
Pond No :3
300
100-yr
0.70
5.00 min 16562 ft3
2.64 acres 0.38 ac-ft
Max Release Rate =1.10 cfs
Time (min)
Ft Collins
100-yr
Intensity
(in/hr)
Inflow
Volume
(ft3)
Outflow
Adjustment
Factor
Qav
(cfs)
Outflow Volume
(ft3)
Storage
Volume
(ft3)
5 9.950 5516 1.00 1.10 330 5186
10 7.720 8560 1.00 1.10 660 7900
15 6.520 10844 1.00 1.10 990 9854
20 5.600 12419 1.00 1.10 1320 11099
25 4.980 13805 1.00 1.10 1650 12155
30 4.520 15035 1.00 1.10 1980 13055
35 4.080 15834 1.00 1.10 2310 13524
40 3.740 16588 1.00 1.10 2640 13948
45 3.460 17264 1.00 1.10 2970 14294
50 3.230 17907 1.00 1.10 3300 14607
55 3.030 18478 1.00 1.10 3630 14848
60 2.860 19027 1.00 1.10 3960 15067
65 2.720 19604 1.00 1.10 4290 15314
70 2.590 20103 1.00 1.10 4620 15483
75 2.480 20624 1.00 1.10 4950 15674
80 2.380 21112 1.00 1.10 5280 15832
85 2.290 21583 1.00 1.10 5610 15973
90 2.210 22054 1.00 1.10 5940 16114
95 2.130 22437 1.00 1.10 6270 16167
100 2.060 22841 1.00 1.10 6600 16241
105 2.000 23285 1.00 1.10 6930 16355
110 1.940 23662 1.00 1.10 7260 16402
115 1.890 24100 1.00 1.10 7590 16510
120 1.840 24482 1.00 1.10 7920 16562
*Note: Using the method described in Urban Storm Drainage Criteria Manual Volume 2.
A =
Tc =
Project Location :
Design Point
C =
Design Storm
DETENTION POND CALCULATION; MODIFIED FAA METHOD w/ Ft Collins IDF
Input Variables Results
Required Detention Volume
Fort Collins, CO
1382-002
Fischer Subdivision
Project Number :
Project Name :
8/23/2022
2:48 PM
1382-002_FAA_Pond 3.xls
FAA
Northern Engineering Services
NORTHERNENGINEERING.COM | 970.221.4158
FORT COLLINS | GREELEY
PRELIMINARY DRAINAGE REPORT: FISCHER PROPERTIES
APPENDIX
APPENDIX B
HYDRAULIC COMPUTATIONS
Preliminary Drainage Report November 10, 2020
Watermark Residential
This section intentionally left blank.
Hydraulic calculations will be completed during final design.
NORTHERNENGINEERING.COM | 970.221.4158
FORT COLLINS | GREELEY
PRELIMINARY DRAINAGE REPORT: FISCHER PROPERTIES
APPENDIX
APPENDIX C
WATER QUALITY / LID EXHIBIT
FGGTT G
E E E
EEEEE
ESFDC
EEWNYLOPLAST
DO NOT POLLUTEDRAINS TOWATERWAYS DO NOT POLLUTE DRAINS TO WA
T
E
R
W
A
Y
S
NYLOPLAST DUCTILE IRON
UD
UD
NYLOPLAST
DO NOT POLLUTEDRAINS TOWATERWAYS DO NOT POLLUTE DRAINS TO WA
T
E
R
W
A
Y
S
NYLOPLAST DUCTILE IRONUD DS
DS
DS
DS
DS DS
DS
DS
DS
DS
DS
DS DS
DS
DS
DS
DS
DS
DS
DS
DS
DS
DS DS
DS DS DS DS DS
DS
DS
DS
DS
DS
DS
DS
DS
DS
DS
DS
DS
DS
DS
DSDS
DS
NYLOPLAST
DO NOT POLLUTEDRAINS TOWATERWAYSDO NOT POLLUTE DRAINS TO WA
T
E
R
W
A
Y
S
NYLOPLAST DUCTILE IRON
XX
XXXXXXXX X
D
D
D
D
D
D
STSTSTST0.52 ac.
OS-2
1.83 ac.
200
2.64 ac.
300
0.40 ac.
OS-3
0.93 ac.
OS-4
0.13 ac.
OS-1
200
300
OS-2
OS-1
OS-3
OS-4
0.60 ac.
100
RAIN
GARDEN A
STORMTECH
CHAMBERS 2
DETENTION
POND 1
100-YR WSEL =
5031.27
DETENTION
POND 1
100-yr
WSEL =
5030.03
0.23 ac.
OF-1
0.04 ac.
OF-2
DRAWN BY:
SCALE:
ISSUED:
FISCHER PROPERTIES
SHEET NO:
FORT COLLINS: 301 North Howes Street, Suite 100, 80521
GREELEY: 820 8th Street, 80631
E N G I N E E R N GI
EHTRON R N
970.221.4158
northernengineering.com
LID EXHIBIT
A. Boese
1in=120ft
8/24/22
PROPOSED STORM SEWER
PROPOSED CURB & GUTTER
PROPERTY BOUNDARY
PROPOSED INLET
ADESIGN POINT
DRAINAGE BASIN LABEL
DRAINAGE BASIN BOUNDARY
A
LEGEND:
( IN FEET )
1 inch = ft.
Feet0100100
100
RAIN GARDEN LIMITS
STORMTECH CHAMBERS
FOR DRAINAGE REVIEW ONLY
NOT FOR CONSTRUCTION
LID Site Summary - New Impervious Area
Total Area of Current Development 232,598 ft2
Total On-site Impervious Area 143,631 ft2
75% Required Minimum Area to be Treated by LID 107,723 ft2
Total On-site Impervious Area Treated by LID 127,813 ft2
Percent On-site Impervious Treated by LID 88.99%
Additional Off-site Impervious Area Treated by LID 9,176 ft2
Percent Total Impervious Area Treated by LID 95.38%
Total Impervious Area Treated by Traditional WQ 13,385 ft2
Percent Impervious Treated by Traditional Water Quality 9.32%
Percent Impervious Area Treated by Traditional WQ or LID 104.70%
Project Number:Project:
Project Location:
Calculations By:Date:
Sq. Ft. Acres
100 26,246 0.60 51%n/a Traditional 0 13,385
200 79,693 1.83 81%Stormtech 2 Stormtech 2,134 64,551
300 115,021 2.64 55%Rain Garden A Rain Garden 1,690 63,262
OF-1 9,836 0.23 13%n/a n/a 0 1,279
OF-2 1,803 0.04 64%n/a n/a 0 1,154
Total On-site 232,598 5.34 143,631
OS-1 5,772 0.13 80%n/a n/a 0 4,617
OS-2 22,580 0.52 26%n/a n/a 0 5,871
OS-3* 17,304 0.40 25%Rain Garden A Rain Garden 0 4,326
OS-4* 40,418 0.93 12%Stormtech 2 Stormtech 0 4,850
Total Off-Site 86,074 1.98 19,664
Sq. Ft. Acres
Rain Garden A 132,326 3.04 51%67,588 300, OS-3 Rain Garden 1,844 2,213
Stormtech 2 120,111 2.76 58%69,401 200, OS-4 Stormtech 1,841 2,209
Total 252,437 5.80 136,989 4,422
Sq. Ft. Acres
WQ Pond 1 26,246 0.60 51%13,385 100 Standard 455 546
Total 26,246 0.60 13,385 546
232,598 ft2
143,631 ft2
107,723 ft2
127,813 ft2
88.99%
9,176 ft2
95.38%
13,385 ft2
9.32%
104.70%
Vol. w/20%
Increase per
Fort Collins
Manual (ft3)
Total Impervious Area Treated by Traditional WQ
Percent Impervious Treated by Traditional Water Quality
WQ Treatment
Tributary Area Weighted %
Impervious
LID Site Summary - New Impervious Area
Percent Total Impervious Area Treated by LID
Treatment Type Volume per
UD-BMP (ft3)
Additional Off-site Impervious Area Treated by LID
Percent On-site Impervious Treated by LID
Percent Impervious Area Treated by Traditional WQ or LID
Total On-site Impervious Area Treated by LID
75% Required Minimum Area to be Treated by LID
Total Area of Current Development
Total On-site Impervious Area
Subbasin ID
Required
Volume (ft3)
LID Summary per Basin
Tributary Area Weighted %
Impervious
Impervious
Area (ft2)
Vol. w/20%
Increase per
Fort Collins
Manual (ft3)
Subbasin ID Treatment TypeWQ Treatment Volume per
UD-BMP (ft3)
Impervious
Area (ft2)
Water Quality Treatment via LID
Water Quality Treatment via Traditional Water Quality
LID Summary
AreaBasin ID WQ Treatment Type
Percent
Impervious LID ID
Fischer Subdivision
8/24/2022
1382-002
Fort Collins, Colorado
A. Boese
Total
Impervious
Area (ft2)
Project Title Date:
Project Number Calcs By:
City
Basins
1
WQCV = Watershed inches of Runoff (inches)51%
a = Runoff Volume Reduction (constant)
i = Total imperviousness Ratio (i = Iwq/100)0.209 in
0.60 ac
0.0104 ac-ft
0.0125 ac-ft
V = Water Quality Design Volume (ac-ft)
WQCV = Water Quality Capture Volume (inches)
A = Watershed Area (acres)
Pond 1
455 cu. ft.
Drain Time
a =
i =
WQCV =
Fischer Subdivision August 23, 2022
1382-002 A. Boese
Fort Collins
546 cu. ft.
V =
V (120%) =
A =
Figure EDB-2 - Water Quality Capture Volume (WQCV), 80th Percentile Runoff Event
0.231
0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
0.4
0.45
0.5
00.10.20.30.40.50.60.70.80.91WQCV (watershed inches)Total Imperviousness Ratio (i = Iwq/100)
Water Quality Capture Volume
6 hr
12 hr
24 hr
40 hr
iii78.019.10.91aWQCV 23
iii78.019.10.91aWQCV 23
AV*12
WQCV
40 hr
Project Title Date:
Project Number Calcs By:
City
Basins
0.8
WQCV = Watershed inches of Runoff (inches)58%
a = Runoff Volume Reduction (constant)
i = Total imperviousness Ratio (i = Iwq/100)0.184 in
2.76 ac
0.0423 ac-ft
0.0507 ac-ft
V = Water Quality Design Volume (ac-ft)
WQCV = Water Quality Capture Volume (inches)
A = Watershed Area (acres)
2209 cu. ft.
V =
V (120%) =
A =
Fischer Subdivision August 23, 2022
1382-002 A. Boese
Fort Collins
Stormtech Chambers 2
1841 cu. ft.
Drain Time
a =
i =
WQCV =
Figure EDB-2 - Water Quality Capture Volume (WQCV), 80th Percentile Runoff Event
0.231
0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
0.4
0.45
0.5
00.10.20.30.40.50.60.70.80.91WQCV (watershed inches)Total Imperviousness Ratio (i = Iwq/100)
Water Quality Capture Volume
6 hr
12 hr
24 hr
40 hr
iii78.019.10.91aWQCV 23
iii78.019.10.91aWQCV 23
AV*12
WQCV
12 hr
Pond No :
200
WQ
0.72
5.00 min 2056 ft3
2.76 acres 0.05 ac-ft
Max Release Rate =0.45 cfs
Time (min)
Ft Collins
WQ
Intensity
(in/hr)
Inflow
Volume
(ft3)
Outflow
Adjustment
Factor
QWQ
(cfs)
Outflow Volume
(ft3)
Storage Volume
(ft3)
5 1.425 850 1.00 0.45 135 715
10 1.105 1318 1.00 0.45 270 1048
15 0.935 1672 0.67 0.30 270 1402
20 0.805 1920 0.63 0.28 338 1582
25 0.715 2131 0.60 0.27 405 1726
30 0.650 2325 0.58 0.26 473 1853
35 0.585 2441 0.57 0.26 540 1901
40 0.535 2552 0.56 0.25 608 1944
45 0.495 2656 0.56 0.25 675 1981
50 0.460 2742 0.55 0.25 743 2000
55 0.435 2853 0.55 0.25 810 2043
60 0.410 2933 0.54 0.24 878 2056
65 0.385 2984 0.54 0.24 945 2039
70 0.365 3046 0.54 0.24 1013 2034
75 0.345 3085 0.53 0.24 1080 2005
80 0.330 3148 0.53 0.24 1148 2000
85 0.315 3192 0.53 0.24 1215 1977
90 0.305 3273 0.53 0.24 1283 1990
95 0.290 3285 0.53 0.24 1350 1935
100 0.280 3338 0.53 0.24 1418 1921
105 0.270 3380 0.52 0.24 1485 1895
110 0.260 3410 0.52 0.24 1553 1858
115 0.255 3496 0.52 0.23 1620 1876
120 0.245 3505 0.52 0.23 1688 1818
*Note: Using the method described in FCSCM Chapter 6 Section 2.3
DETENTION POND CALCULATION; MODIFIED FAA METHOD w/ Ft Collins IDF
Input Variables Results
Required Detention Volume
Fort Collins, Colorado
1382-002
Fischer Subdivission
Project Number :
Project Name :
Chambers 2
A =
Tc =
Project Location :
Design Point
C =
Design Storm
Page 1 of 1
1382-002 Chamber Summary 2.xlsx
Vault ID
Total
Required
WQ Volume
(cf)
Flow,
WQ
(cfs)
Chamber
Type
Chamber Release
Ratea
(cfs)
Chamber
Volumeb
(cf)
Installed
Chamber w/
Aggregatec
(cf)
Minimum No.
of Chambersd
Total Release
Ratee
(cfs)
Required
Storage
Volume by
FAA Method
(cf)
Minimum No.
of Chambersf
Provided
Number of
Chambers
Provided
Release Rate
(cfs)
Storage
Provided
within the
Chambersg
(cf)
Total
Installed
System
Volumeh
(cf)
Pond2 2209 2.27 MC-3500 0.024 109.90 158.73 14 0.33 2056 19 19 0.45 2088 3968
a. Release rate per chamber, limited by flow through geotextile with accumulated sediment.
b. Volume within chamber only, not accounting for void spaces in surrounding aggregate.
c. Volume includes chamber and void spaces (30%) in surrounding aggregate, per chamber unit.
d. Number of chambers required to provide full WQCV within total installed system, including aggregate.
e. Release rate per chamber times number of chambers.
f. Number of chambers required to provide required FAA storage volume stored within the chamber only (no aggregate storage).
g. Volume provided in chambers only (no aggregate storage). This number must meet or exceed the required FAA storage volume.
h. System volume includes total number of chambers, plus surrounding aggregate. This number must meet or exceed the required WQCV.
Chamber Configuration Summary
P:\1382-002\Drainage\LID\1382-002 Chamber Summary 2.xlsx
Sheet 1 of 2
Designer:
Company:
Date:
Project:
Location:
1. Basin Storage Volume
A) Effective Imperviousness of Tributary Area, Ia Ia =51.0 %
(100% if all paved and roofed areas upstream of rain garden)
B) Tributary Area's Imperviousness Ratio (i = Ia/100)i =0.510
C) Water Quality Capture Volume (WQCV) for a 12-hour Drain Time WQCV = 0.17 watershed inches
(WQCV= 0.8 * (0.91* i3 - 1.19 * i2 + 0.78 * i)
D) Contributing Watershed Area (including rain garden area) Area = 132,326 sq ft
E) Water Quality Capture Volume (WQCV) Design Volume VWQCV =1,844 cu ft
Vol = (WQCV / 12) * Area
F) For Watersheds Outside of the Denver Region, Depth of d6 = in
Average Runoff Producing Storm
G) For Watersheds Outside of the Denver Region, VWQCV OTHER =cu ft
Water Quality Capture Volume (WQCV) Design Volume
H) User Input of Water Quality Capture Volume (WQCV) Design Volume VWQCV USER =cu ft
(Only if a different WQCV Design Volume is desired)
2. Basin Geometry
A) WQCV Depth (12-inch maximum)DWQCV =12 in
B) Rain Garden Side Slopes (Z = 4 min., horiz. dist per unit vertical) Z = 4.00 ft / ft
(Use "0" if rain garden has vertical walls)
C) Mimimum Flat Surface Area AMin =1350 sq ft
D) Actual Flat Surface Area AActual =1409 sq ft
E) Area at Design Depth (Top Surface Area)ATop =3100 sq ft
F) Rain Garden Total Volume VT=2,255 cu ft
(VT= ((ATop + AActual) / 2) * Depth)
3. Growing Media
4. Underdrain System
A) Are underdrains provided?1
B) Underdrain system orifice diameter for 12 hour drain time
i) Distance From Lowest Elevation of the Storage y =ft
Volume to the Center of the Orifice
ii) Volume to Drain in 12 Hours Vol12 =cu ft
iii) Orifice Diameter, 3/8" Minimum DO = in
Design Procedure Form: Rain Garden (RG)
A. Boese
August 23, 2022
Fischer - Rain Garden A
Fort Collins
UD-BMP (Version 3.07, March 2018)
Choose One
Choose One
18" Rain Garden Growing Media
Other (Explain):
YES
NO
1382-002_Pond 3 - SF-UD-BMP_v3.07.xlsm, RG 8/23/2022, 2:47 PM
Sheet 2 of 2
Designer:
Company:
Date:
Project:
Location:
5. Impermeable Geomembrane Liner and Geotextile Separator Fabric
A) Is an impermeable liner provided due to proximity
of structures or groundwater contamination?
6. Inlet / Outlet Control
A) Inlet Control
7. Vegetation
8. Irrigation
A) Will the rain garden be irrigated?
Notes:
Design Procedure Form: Rain Garden (RG)
A. Boese
August 23, 2022
Fischer - Rain Garden A
Fort Collins
Choose One
Choose One
Choose One
Sheet Flow- No Energy Dissipation Required
Concentrated Flow- Energy Dissipation Provided
Plantings
Seed (Plan for frequent weed control)
Sand Grown or Other High Infiltration Sod
Choose One
YES
NO
YES
NO
1382-002_Pond 3 - SF-UD-BMP_v3.07.xlsm, RG 8/23/2022, 2:47 PM
NORTHERNENGINEERING.COM | 970.221.4158
FORT COLLINS | GREELEY
PRELIMINARY DRAINAGE REPORT: FISCHER PROPERTIES
APPENDIX
APPENDIX D
EROSION CONTROL REPORT
Preliminary Drainage Report November 10, 2020
Watermark Residential Erosion Control Report
Erosion Control Report
A comprehensive Erosion and Sediment Control Plan (along with associated details) has been
included with the final construction drawings. It should be noted, however, that any such
Erosion and Sediment Control Plan serves only as a general guide to the Contractor. Staging
and/or phasing of the BMPs depicted, and additional or different BMPs from those included
may be necessary during construction, or as required by the authorities having jurisdiction.
It shall be the responsibility of the Contractor to ensure erosion control measures are properly
maintained and followed. The Erosion and Sediment Control Plan is intended to be a living
document, constantly adapting to site conditions and needs. The Contractor shall update the
location of BMPs as they are installed, removed or modified in conjunction with construction
activities. It is imperative to appropriately reflect the current site conditions at all times.
The Erosion and Sediment Control Plan shall address both temporary measures to be
implemented during construction, as well as permanent erosion control protection. Best
Management Practices from the Volume 3, Chapter 7 – Construction BMPs will be utilized.
Measures may include, but are not limited to, silt fencing and/or wattles along the disturbed
perimeter, gutter protection in the adjacent roadways and inlet protection at existing and
proposed storm inlets. Vehicle tracking control pads, spill containment and clean-up
procedures, designated concrete washout areas, dumpsters, and job site restrooms shall also be
provided by the Contractor.
Grading and Erosion Control Notes can be found on Sheet CS2 of the Utility Plans. The Final
Utility Plans will also contain a full-size Erosion Control Plan as well as a separate sheet
dedicated to Erosion Control Details. In addition to this report and the referenced plan sheets,
the Contractor shall be aware of, and adhere to, the applicable requirements outlined in any
existing Development Agreement(s) of record, as well as the Development Agreement, to be
recorded prior to issuance of the Development Construction Permit. Also, the Site Contractor
for this project may be required to secure a Stormwater Construction General Permit from the
Colorado Department of Public Health and Environment (CDPHE), Water Quality Control
Division – Stormwater Program, before commencing any earth disturbing activities. Prior to
securing said permit, the Site Contractor shall develop a comprehensive Storm Water
Management Plan (SWMP) pursuant to CDPHE requirements and guidelines. The SWMP will
further describe and document the ongoing activities, inspections, and maintenance of
construction BMPs.
NORTHERNENGINEERING.COM | 970.221.4158
FORT COLLINS | GREELEY
PRELIMINARY DRAINAGE REPORT: FISCHER PROPERTIES
APPENDIX
APPENDIX E
USDA SOILS REPORT
United States
Department of
Agriculture
A product of the National
Cooperative Soil Survey,
a joint effort of the United
States Department of
Agriculture and other
Federal agencies, State
agencies including the
Agricultural Experiment
Stations, and local
participants
Custom Soil Resource
Report for
Larimer County
Area, ColoradoNatural
Resources
Conservation
Service
March 14, 2022
Preface
Soil surveys contain information that affects land use planning in survey areas.
They highlight soil limitations that affect various land uses and provide information
about the properties of the soils in the survey areas. Soil surveys are designed for
many different users, including farmers, ranchers, foresters, agronomists, urban
planners, community officials, engineers, developers, builders, and home buyers.
Also, conservationists, teachers, students, and specialists in recreation, waste
disposal, and pollution control can use the surveys to help them understand,
protect, or enhance the environment.
Various land use regulations of Federal, State, and local governments may impose
special restrictions on land use or land treatment. Soil surveys identify soil
properties that are used in making various land use or land treatment decisions.
The information is intended to help the land users identify and reduce the effects of
soil limitations on various land uses. The landowner or user is responsible for
identifying and complying with existing laws and regulations.
Although soil survey information can be used for general farm, local, and wider area
planning, onsite investigation is needed to supplement this information in some
cases. Examples include soil quality assessments (http://www.nrcs.usda.gov/wps/
portal/nrcs/main/soils/health/) and certain conservation and engineering
applications. For more detailed information, contact your local USDA Service Center
(https://offices.sc.egov.usda.gov/locator/app?agency=nrcs) or your NRCS State Soil
Scientist (http://www.nrcs.usda.gov/wps/portal/nrcs/detail/soils/contactus/?
cid=nrcs142p2_053951).
Great differences in soil properties can occur within short distances. Some soils are
seasonally wet or subject to flooding. Some are too unstable to be used as a
foundation for buildings or roads. Clayey or wet soils are poorly suited to use as
septic tank absorption fields. A high water table makes a soil poorly suited to
basements or underground installations.
The National Cooperative Soil Survey is a joint effort of the United States
Department of Agriculture and other Federal agencies, State agencies including the
Agricultural Experiment Stations, and local agencies. The Natural Resources
Conservation Service (NRCS) has leadership for the Federal part of the National
Cooperative Soil Survey.
Information about soils is updated periodically. Updated information is available
through the NRCS Web Soil Survey, the site for official soil survey information.
The U.S. Department of Agriculture (USDA) prohibits discrimination in all its
programs and activities on the basis of race, color, national origin, age, disability,
and where applicable, sex, marital status, familial status, parental status, religion,
sexual orientation, genetic information, political beliefs, reprisal, or because all or a
part of an individual's income is derived from any public assistance program. (Not
all prohibited bases apply to all programs.) Persons with disabilities who require
2
alternative means for communication of program information (Braille, large print,
audiotape, etc.) should contact USDA's TARGET Center at (202) 720-2600 (voice
and TDD). To file a complaint of discrimination, write to USDA, Director, Office of
Civil Rights, 1400 Independence Avenue, S.W., Washington, D.C. 20250-9410 or
call (800) 795-3272 (voice) or (202) 720-6382 (TDD). USDA is an equal opportunity
provider and employer.
3
Contents
Preface....................................................................................................................2
How Soil Surveys Are Made..................................................................................5
Soil Map..................................................................................................................8
Soil Map................................................................................................................9
Legend................................................................................................................10
Map Unit Legend................................................................................................11
Map Unit Descriptions.........................................................................................11
Larimer County Area, Colorado......................................................................13
3—Altvan-Satanta loams, 0 to 3 percent slopes.........................................13
76—Nunn clay loam, wet, 1 to 3 percent slopes.........................................15
Soil Information for All Uses...............................................................................17
Soil Properties and Qualities..............................................................................17
Soil Erosion Factors........................................................................................17
K Factor, Whole Soil....................................................................................17
Soil Qualities and Features.............................................................................20
Hydrologic Soil Group.................................................................................20
References............................................................................................................25
4
How Soil Surveys Are Made
Soil surveys are made to provide information about the soils and miscellaneous
areas in a specific area. They include a description of the soils and miscellaneous
areas and their location on the landscape and tables that show soil properties and
limitations affecting various uses. Soil scientists observed the steepness, length,
and shape of the slopes; the general pattern of drainage; the kinds of crops and
native plants; and the kinds of bedrock. They observed and described many soil
profiles. A soil profile is the sequence of natural layers, or horizons, in a soil. The
profile extends from the surface down into the unconsolidated material in which the
soil formed or from the surface down to bedrock. The unconsolidated material is
devoid of roots and other living organisms and has not been changed by other
biological activity.
Currently, soils are mapped according to the boundaries of major land resource
areas (MLRAs). MLRAs are geographically associated land resource units that
share common characteristics related to physiography, geology, climate, water
resources, soils, biological resources, and land uses (USDA, 2006). Soil survey
areas typically consist of parts of one or more MLRA.
The soils and miscellaneous areas in a survey area occur in an orderly pattern that
is related to the geology, landforms, relief, climate, and natural vegetation of the
area. Each kind of soil and miscellaneous area is associated with a particular kind
of landform or with a segment of the landform. By observing the soils and
miscellaneous areas in the survey area and relating their position to specific
segments of the landform, a soil scientist develops a concept, or model, of how they
were formed. Thus, during mapping, this model enables the soil scientist to predict
with a considerable degree of accuracy the kind of soil or miscellaneous area at a
specific location on the landscape.
Commonly, individual soils on the landscape merge into one another as their
characteristics gradually change. To construct an accurate soil map, however, soil
scientists must determine the boundaries between the soils. They can observe only
a limited number of soil profiles. Nevertheless, these observations, supplemented
by an understanding of the soil-vegetation-landscape relationship, are sufficient to
verify predictions of the kinds of soil in an area and to determine the boundaries.
Soil scientists recorded the characteristics of the soil profiles that they studied. They
noted soil color, texture, size and shape of soil aggregates, kind and amount of rock
fragments, distribution of plant roots, reaction, and other features that enable them
to identify soils. After describing the soils in the survey area and determining their
properties, the soil scientists assigned the soils to taxonomic classes (units).
Taxonomic classes are concepts. Each taxonomic class has a set of soil
characteristics with precisely defined limits. The classes are used as a basis for
comparison to classify soils systematically. Soil taxonomy, the system of taxonomic
classification used in the United States, is based mainly on the kind and character
of soil properties and the arrangement of horizons within the profile. After the soil
5
scientists classified and named the soils in the survey area, they compared the
individual soils with similar soils in the same taxonomic class in other areas so that
they could confirm data and assemble additional data based on experience and
research.
The objective of soil mapping is not to delineate pure map unit components; the
objective is to separate the landscape into landforms or landform segments that
have similar use and management requirements. Each map unit is defined by a
unique combination of soil components and/or miscellaneous areas in predictable
proportions. Some components may be highly contrasting to the other components
of the map unit. The presence of minor components in a map unit in no way
diminishes the usefulness or accuracy of the data. The delineation of such
landforms and landform segments on the map provides sufficient information for the
development of resource plans. If intensive use of small areas is planned, onsite
investigation is needed to define and locate the soils and miscellaneous areas.
Soil scientists make many field observations in the process of producing a soil map.
The frequency of observation is dependent upon several factors, including scale of
mapping, intensity of mapping, design of map units, complexity of the landscape,
and experience of the soil scientist. Observations are made to test and refine the
soil-landscape model and predictions and to verify the classification of the soils at
specific locations. Once the soil-landscape model is refined, a significantly smaller
number of measurements of individual soil properties are made and recorded.
These measurements may include field measurements, such as those for color,
depth to bedrock, and texture, and laboratory measurements, such as those for
content of sand, silt, clay, salt, and other components. Properties of each soil
typically vary from one point to another across the landscape.
Observations for map unit components are aggregated to develop ranges of
characteristics for the components. The aggregated values are presented. Direct
measurements do not exist for every property presented for every map unit
component. Values for some properties are estimated from combinations of other
properties.
While a soil survey is in progress, samples of some of the soils in the area generally
are collected for laboratory analyses and for engineering tests. Soil scientists
interpret the data from these analyses and tests as well as the field-observed
characteristics and the soil properties to determine the expected behavior of the
soils under different uses. Interpretations for all of the soils are field tested through
observation of the soils in different uses and under different levels of management.
Some interpretations are modified to fit local conditions, and some new
interpretations are developed to meet local needs. Data are assembled from other
sources, such as research information, production records, and field experience of
specialists. For example, data on crop yields under defined levels of management
are assembled from farm records and from field or plot experiments on the same
kinds of soil.
Predictions about soil behavior are based not only on soil properties but also on
such variables as climate and biological activity. Soil conditions are predictable over
long periods of time, but they are not predictable from year to year. For example,
soil scientists can predict with a fairly high degree of accuracy that a given soil will
have a high water table within certain depths in most years, but they cannot predict
that a high water table will always be at a specific level in the soil on a specific date.
After soil scientists located and identified the significant natural bodies of soil in the
survey area, they drew the boundaries of these bodies on aerial photographs and
Custom Soil Resource Report
6
identified each as a specific map unit. Aerial photographs show trees, buildings,
fields, roads, and rivers, all of which help in locating boundaries accurately.
Custom Soil Resource Report
7
Soil Map
The soil map section includes the soil map for the defined area of interest, a list of
soil map units on the map and extent of each map unit, and cartographic symbols
displayed on the map. Also presented are various metadata about data used to
produce the map, and a description of each soil map unit.
8
9
Custom Soil Resource Report
Soil Map
44909804491040449110044911604491220449128044913404490980449104044911004491160449122044912804491340491490 491550 491610 491670 491730 491790 491850 491910 491970 492030
491490 491550 491610 491670 491730 491790 491850 491910 491970 492030
40° 34' 22'' N 105° 6' 3'' W40° 34' 22'' N105° 5' 37'' W40° 34' 9'' N
105° 6' 3'' W40° 34' 9'' N
105° 5' 37'' WN
Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 13N WGS84
0 100 200 400 600
Feet
0 40 80 160 240
Meters
Map Scale: 1:2,770 if printed on A landscape (11" x 8.5") sheet.
Soil Map may not be valid at this scale.
MAP LEGEND MAP INFORMATION
Area of Interest (AOI)
Area of Interest (AOI)
Soils
Soil Map Unit Polygons
Soil Map Unit Lines
Soil Map Unit Points
Special Point Features
Blowout
Borrow Pit
Clay Spot
Closed Depression
Gravel Pit
Gravelly Spot
Landfill
Lava Flow
Marsh or swamp
Mine or Quarry
Miscellaneous Water
Perennial Water
Rock Outcrop
Saline Spot
Sandy Spot
Severely Eroded Spot
Sinkhole
Slide or Slip
Sodic Spot
Spoil Area
Stony Spot
Very Stony Spot
Wet Spot
Other
Special Line Features
Water Features
Streams and Canals
Transportation
Rails
Interstate Highways
US Routes
Major Roads
Local Roads
Background
Aerial Photography
The soil surveys that comprise your AOI were mapped at
1:24,000.
Warning: Soil Map may not be valid at this scale.
Enlargement of maps beyond the scale of mapping can cause
misunderstanding of the detail of mapping and accuracy of soil
line placement. The maps do not show the small areas of
contrasting soils that could have been shown at a more detailed
scale.
Please rely on the bar scale on each map sheet for map
measurements.
Source of Map: Natural Resources Conservation Service
Web Soil Survey URL:
Coordinate System: Web Mercator (EPSG:3857)
Maps from the Web Soil Survey are based on the Web Mercator
projection, which preserves direction and shape but distorts
distance and area. A projection that preserves area, such as the
Albers equal-area conic projection, should be used if more
accurate calculations of distance or area are required.
This product is generated from the USDA-NRCS certified data as
of the version date(s) listed below.
Soil Survey Area: Larimer County Area, Colorado
Survey Area Data: Version 16, Sep 2, 2021
Soil map units are labeled (as space allows) for map scales
1:50,000 or larger.
Date(s) aerial images were photographed: Aug 11, 2018—Aug
12, 2018
The orthophoto or other base map on which the soil lines were
compiled and digitized probably differs from the background
imagery displayed on these maps. As a result, some minor
shifting of map unit boundaries may be evident.
Custom Soil Resource Report
10
Map Unit Legend
Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI
3 Altvan-Satanta loams, 0 to 3
percent slopes
19.8 66.5%
76 Nunn clay loam, wet, 1 to 3
percent slopes
9.9 33.5%
Totals for Area of Interest 29.7 100.0%
Map Unit Descriptions
The map units delineated on the detailed soil maps in a soil survey represent the
soils or miscellaneous areas in the survey area. The map unit descriptions, along
with the maps, can be used to determine the composition and properties of a unit.
A map unit delineation on a soil map represents an area dominated by one or more
major kinds of soil or miscellaneous areas. A map unit is identified and named
according to the taxonomic classification of the dominant soils. Within a taxonomic
class there are precisely defined limits for the properties of the soils. On the
landscape, however, the soils are natural phenomena, and they have the
characteristic variability of all natural phenomena. Thus, the range of some
observed properties may extend beyond the limits defined for a taxonomic class.
Areas of soils of a single taxonomic class rarely, if ever, can be mapped without
including areas of other taxonomic classes. Consequently, every map unit is made
up of the soils or miscellaneous areas for which it is named and some minor
components that belong to taxonomic classes other than those of the major soils.
Most minor soils have properties similar to those of the dominant soil or soils in the
map unit, and thus they do not affect use and management. These are called
noncontrasting, or similar, components. They may or may not be mentioned in a
particular map unit description. Other minor components, however, have properties
and behavioral characteristics divergent enough to affect use or to require different
management. These are called contrasting, or dissimilar, components. They
generally are in small areas and could not be mapped separately because of the
scale used. Some small areas of strongly contrasting soils or miscellaneous areas
are identified by a special symbol on the maps. If included in the database for a
given area, the contrasting minor components are identified in the map unit
descriptions along with some characteristics of each. A few areas of minor
components may not have been observed, and consequently they are not
mentioned in the descriptions, especially where the pattern was so complex that it
was impractical to make enough observations to identify all the soils and
miscellaneous areas on the landscape.
The presence of minor components in a map unit in no way diminishes the
usefulness or accuracy of the data. The objective of mapping is not to delineate
pure taxonomic classes but rather to separate the landscape into landforms or
landform segments that have similar use and management requirements. The
delineation of such segments on the map provides sufficient information for the
development of resource plans. If intensive use of small areas is planned, however,
Custom Soil Resource Report
11
onsite investigation is needed to define and locate the soils and miscellaneous
areas.
An identifying symbol precedes the map unit name in the map unit descriptions.
Each description includes general facts about the unit and gives important soil
properties and qualities.
Soils that have profiles that are almost alike make up a soil series. Except for
differences in texture of the surface layer, all the soils of a series have major
horizons that are similar in composition, thickness, and arrangement.
Soils of one series can differ in texture of the surface layer, slope, stoniness,
salinity, degree of erosion, and other characteristics that affect their use. On the
basis of such differences, a soil series is divided into soil phases. Most of the areas
shown on the detailed soil maps are phases of soil series. The name of a soil phase
commonly indicates a feature that affects use or management. For example, Alpha
silt loam, 0 to 2 percent slopes, is a phase of the Alpha series.
Some map units are made up of two or more major soils or miscellaneous areas.
These map units are complexes, associations, or undifferentiated groups.
A complex consists of two or more soils or miscellaneous areas in such an intricate
pattern or in such small areas that they cannot be shown separately on the maps.
The pattern and proportion of the soils or miscellaneous areas are somewhat similar
in all areas. Alpha-Beta complex, 0 to 6 percent slopes, is an example.
An association is made up of two or more geographically associated soils or
miscellaneous areas that are shown as one unit on the maps. Because of present
or anticipated uses of the map units in the survey area, it was not considered
practical or necessary to map the soils or miscellaneous areas separately. The
pattern and relative proportion of the soils or miscellaneous areas are somewhat
similar. Alpha-Beta association, 0 to 2 percent slopes, is an example.
An undifferentiated group is made up of two or more soils or miscellaneous areas
that could be mapped individually but are mapped as one unit because similar
interpretations can be made for use and management. The pattern and proportion
of the soils or miscellaneous areas in a mapped area are not uniform. An area can
be made up of only one of the major soils or miscellaneous areas, or it can be made
up of all of them. Alpha and Beta soils, 0 to 2 percent slopes, is an example.
Some surveys include miscellaneous areas. Such areas have little or no soil
material and support little or no vegetation. Rock outcrop is an example.
Custom Soil Resource Report
12
Larimer County Area, Colorado
3—Altvan-Satanta loams, 0 to 3 percent slopes
Map Unit Setting
National map unit symbol: jpw2
Elevation: 5,200 to 6,200 feet
Mean annual precipitation: 13 to 15 inches
Mean annual air temperature: 48 to 50 degrees F
Frost-free period: 135 to 150 days
Farmland classification: Prime farmland if irrigated
Map Unit Composition
Altvan and similar soils:45 percent
Satanta and similar soils:30 percent
Minor components:25 percent
Estimates are based on observations, descriptions, and transects of the mapunit.
Description of Altvan
Setting
Landform:Terraces, benches
Landform position (three-dimensional):Side slope, tread
Down-slope shape:Linear
Across-slope shape:Linear
Parent material:Mixed alluvium
Typical profile
H1 - 0 to 10 inches: loam
H2 - 10 to 18 inches: clay loam
H3 - 18 to 30 inches: loam
H4 - 30 to 60 inches: gravelly sand
Properties and qualities
Slope:0 to 3 percent
Depth to restrictive feature:More than 80 inches
Drainage class:Well drained
Runoff class: Low
Capacity of the most limiting layer to transmit water (Ksat):Moderately high to high
(0.60 to 2.00 in/hr)
Depth to water table:More than 80 inches
Frequency of flooding:None
Frequency of ponding:None
Calcium carbonate, maximum content:10 percent
Available water supply, 0 to 60 inches: Low (about 5.4 inches)
Interpretive groups
Land capability classification (irrigated): 3e
Land capability classification (nonirrigated): 3e
Hydrologic Soil Group: B
Ecological site: R067BY002CO - Loamy Plains
Hydric soil rating: No
Custom Soil Resource Report
13
Description of Satanta
Setting
Landform:Structural benches, terraces
Landform position (three-dimensional):Side slope, tread
Down-slope shape:Linear
Across-slope shape:Linear
Parent material:Mixed alluvium and/or eolian deposits
Typical profile
H1 - 0 to 9 inches: loam
H2 - 9 to 18 inches: loam
H3 - 18 to 60 inches: loam
Properties and qualities
Slope:0 to 1 percent
Depth to restrictive feature:More than 80 inches
Drainage class:Well drained
Runoff class: Low
Capacity of the most limiting layer to transmit water (Ksat):Moderately high to high
(0.60 to 2.00 in/hr)
Depth to water table:More than 80 inches
Frequency of flooding:None
Frequency of ponding:None
Calcium carbonate, maximum content:10 percent
Available water supply, 0 to 60 inches: High (about 10.1 inches)
Interpretive groups
Land capability classification (irrigated): 1
Land capability classification (nonirrigated): 3c
Hydrologic Soil Group: B
Ecological site: R067BY002CO - Loamy Plains
Hydric soil rating: No
Minor Components
Nunn
Percent of map unit:10 percent
Ecological site:R067BZ902CO - Loamy Plains
Hydric soil rating: No
Larim
Percent of map unit:10 percent
Ecological site:R067BY063CO - Gravel Breaks
Hydric soil rating: No
Stoneham
Percent of map unit:5 percent
Ecological site:R067BZ902CO - Loamy Plains
Hydric soil rating: No
Custom Soil Resource Report
14
76—Nunn clay loam, wet, 1 to 3 percent slopes
Map Unit Setting
National map unit symbol: jpxq
Elevation: 4,800 to 5,600 feet
Mean annual precipitation: 13 to 15 inches
Mean annual air temperature: 48 to 50 degrees F
Frost-free period: 135 to 150 days
Farmland classification: Prime farmland if irrigated
Map Unit Composition
Nunn, wet, and similar soils:90 percent
Minor components:10 percent
Estimates are based on observations, descriptions, and transects of the mapunit.
Description of Nunn, Wet
Setting
Landform:Stream terraces, alluvial fans
Landform position (three-dimensional):Base slope, tread
Down-slope shape:Linear
Across-slope shape:Linear
Parent material:Alluvium
Typical profile
H1 - 0 to 10 inches: clay loam
H2 - 10 to 47 inches: clay
H3 - 47 to 60 inches: gravelly loam
Properties and qualities
Slope:1 to 3 percent
Depth to restrictive feature:More than 80 inches
Drainage class:Somewhat poorly drained
Runoff class: Medium
Capacity of the most limiting layer to transmit water (Ksat):Moderately low to
moderately high (0.06 to 0.60 in/hr)
Depth to water table:About 24 to 36 inches
Frequency of flooding:NoneRare
Frequency of ponding:None
Calcium carbonate, maximum content:10 percent
Maximum salinity:Nonsaline to very slightly saline (0.0 to 2.0 mmhos/cm)
Available water supply, 0 to 60 inches: High (about 9.9 inches)
Interpretive groups
Land capability classification (irrigated): 2w
Land capability classification (nonirrigated): 3s
Hydrologic Soil Group: C
Ecological site: R067BZ902CO - Loamy Plains
Hydric soil rating: No
Custom Soil Resource Report
15
Minor Components
Heldt
Percent of map unit:6 percent
Ecological site:R067BZ902CO - Loamy Plains
Hydric soil rating: No
Dacono
Percent of map unit:3 percent
Ecological site:R067BY042CO - Clayey Plains
Hydric soil rating: No
Mollic halaquepts
Percent of map unit:1 percent
Landform:Swales
Hydric soil rating: Yes
Custom Soil Resource Report
16
Soil Information for All Uses
Soil Properties and Qualities
The Soil Properties and Qualities section includes various soil properties and
qualities displayed as thematic maps with a summary table for the soil map units in
the selected area of interest. A single value or rating for each map unit is generated
by aggregating the interpretive ratings of individual map unit components. This
aggregation process is defined for each property or quality.
Soil Erosion Factors
Soil Erosion Factors are soil properties and interpretations used in evaluating the
soil for potential erosion. Example soil erosion factors can include K factor for the
whole soil or on a rock free basis, T factor, wind erodibility group and wind erodibility
index.
K Factor, Whole Soil
Erosion factor K indicates the susceptibility of a soil to sheet and rill erosion by
water. Factor K is one of six factors used in the Universal Soil Loss Equation
(USLE) and the Revised Universal Soil Loss Equation (RUSLE) to predict the
average annual rate of soil loss by sheet and rill erosion in tons per acre per year.
The estimates are based primarily on percentage of silt, sand, and organic matter
and on soil structure and saturated hydraulic conductivity (Ksat). Values of K range
from 0.02 to 0.69. Other factors being equal, the higher the value, the more
susceptible the soil is to sheet and rill erosion by water.
"Erosion factor Kw (whole soil)" indicates the erodibility of the whole soil. The
estimates are modified by the presence of rock fragments.
Factor K does not apply to organic horizons and is not reported for those layers.
17
18
Custom Soil Resource Report
Map—K Factor, Whole Soil
44909804491040449110044911604491220449128044913404490980449104044911004491160449122044912804491340491490 491550 491610 491670 491730 491790 491850 491910 491970 492030
491490 491550 491610 491670 491730 491790 491850 491910 491970 492030
40° 34' 22'' N 105° 6' 3'' W40° 34' 22'' N105° 5' 37'' W40° 34' 9'' N
105° 6' 3'' W40° 34' 9'' N
105° 5' 37'' WN
Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 13N WGS84
0 100 200 400 600
Feet
0 40 80 160 240
Meters
Map Scale: 1:2,770 if printed on A landscape (11" x 8.5") sheet.
Soil Map may not be valid at this scale.
MAP LEGEND MAP INFORMATION
Area of Interest (AOI)
Area of Interest (AOI)
Soils
Soil Rating Polygons
.02
.05
.10
.15
.17
.20
.24
.28
.32
.37
.43
.49
.55
.64
Not rated or not available
Soil Rating Lines
.02
.05
.10
.15
.17
.20
.24
.28
.32
.37
.43
.49
.55
.64
Not rated or not available
Soil Rating Points
.02
.05
.10
.15
.17
.20
.24
.28
.32
.37
.43
.49
.55
.64
Not rated or not available
Water Features
Streams and Canals
Transportation
Rails
Interstate Highways
US Routes
Major Roads
Local Roads
Background
Aerial Photography
The soil surveys that comprise your AOI were mapped at
1:24,000.
Warning: Soil Map may not be valid at this scale.
Enlargement of maps beyond the scale of mapping can cause
misunderstanding of the detail of mapping and accuracy of soil
line placement. The maps do not show the small areas of
contrasting soils that could have been shown at a more detailed
scale.
Please rely on the bar scale on each map sheet for map
measurements.
Source of Map: Natural Resources Conservation Service
Web Soil Survey URL:
Coordinate System: Web Mercator (EPSG:3857)
Maps from the Web Soil Survey are based on the Web Mercator
projection, which preserves direction and shape but distorts
distance and area. A projection that preserves area, such as the
Albers equal-area conic projection, should be used if more
accurate calculations of distance or area are required.
This product is generated from the USDA-NRCS certified data
as of the version date(s) listed below.
Soil Survey Area: Larimer County Area, Colorado
Survey Area Data: Version 16, Sep 2, 2021
Soil map units are labeled (as space allows) for map scales
1:50,000 or larger.
Date(s) aerial images were photographed: Aug 11, 2018—Aug
12, 2018
The orthophoto or other base map on which the soil lines were
compiled and digitized probably differs from the background
imagery displayed on these maps. As a result, some minor
shifting of map unit boundaries may be evident.
Custom Soil Resource Report
19
Table—K Factor, Whole Soil
Map unit symbol Map unit name Rating Acres in AOI Percent of AOI
3 Altvan-Satanta loams, 0
to 3 percent slopes
.28 19.8 66.5%
76 Nunn clay loam, wet, 1 to
3 percent slopes
.24 9.9 33.5%
Totals for Area of Interest 29.7 100.0%
Rating Options—K Factor, Whole Soil
Aggregation Method: Dominant Condition
Component Percent Cutoff: None Specified
Tie-break Rule: Higher
Layer Options (Horizon Aggregation Method): Surface Layer (Not applicable)
Soil Qualities and Features
Soil qualities are behavior and performance attributes that are not directly
measured, but are inferred from observations of dynamic conditions and from soil
properties. Example soil qualities include natural drainage, and frost action. Soil
features are attributes that are not directly part of the soil. Example soil features
include slope and depth to restrictive layer. These features can greatly impact the
use and management of the soil.
Hydrologic Soil Group
Hydrologic soil groups are based on estimates of runoff potential. Soils are
assigned to one of four groups according to the rate of water infiltration when the
soils are not protected by vegetation, are thoroughly wet, and receive precipitation
from long-duration storms.
The soils in the United States are assigned to four groups (A, B, C, and D) and
three dual classes (A/D, B/D, and C/D). The groups are defined as follows:
Group A. Soils having a high infiltration rate (low runoff potential) when thoroughly
wet. These consist mainly of deep, well drained to excessively drained sands or
gravelly sands. These soils have a high rate of water transmission.
Group B. Soils having a moderate infiltration rate when thoroughly wet. These
consist chiefly of moderately deep or deep, moderately well drained or well drained
soils that have moderately fine texture to moderately coarse texture. These soils
have a moderate rate of water transmission.
Custom Soil Resource Report
20
Group C. Soils having a slow infiltration rate when thoroughly wet. These consist
chiefly of soils having a layer that impedes the downward movement of water or
soils of moderately fine texture or fine texture. These soils have a slow rate of water
transmission.
Group D. Soils having a very slow infiltration rate (high runoff potential) when
thoroughly wet. These consist chiefly of clays that have a high shrink-swell
potential, soils that have a high water table, soils that have a claypan or clay layer at
or near the surface, and soils that are shallow over nearly impervious material.
These soils have a very slow rate of water transmission.
If a soil is assigned to a dual hydrologic group (A/D, B/D, or C/D), the first letter is
for drained areas and the second is for undrained areas. Only the soils that in their
natural condition are in group D are assigned to dual classes.
Custom Soil Resource Report
21
22
Custom Soil Resource Report
Map—Hydrologic Soil Group
44909804491040449110044911604491220449128044913404490980449104044911004491160449122044912804491340491490 491550 491610 491670 491730 491790 491850 491910 491970 492030
491490 491550 491610 491670 491730 491790 491850 491910 491970 492030
40° 34' 22'' N 105° 6' 3'' W40° 34' 22'' N105° 5' 37'' W40° 34' 9'' N
105° 6' 3'' W40° 34' 9'' N
105° 5' 37'' WN
Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 13N WGS84
0 100 200 400 600
Feet
0 40 80 160 240
Meters
Map Scale: 1:2,770 if printed on A landscape (11" x 8.5") sheet.
Soil Map may not be valid at this scale.
MAP LEGEND MAP INFORMATION
Area of Interest (AOI)
Area of Interest (AOI)
Soils
Soil Rating Polygons
A
A/D
B
B/D
C
C/D
D
Not rated or not available
Soil Rating Lines
A
A/D
B
B/D
C
C/D
D
Not rated or not available
Soil Rating Points
A
A/D
B
B/D
C
C/D
D
Not rated or not available
Water Features
Streams and Canals
Transportation
Rails
Interstate Highways
US Routes
Major Roads
Local Roads
Background
Aerial Photography
The soil surveys that comprise your AOI were mapped at
1:24,000.
Warning: Soil Map may not be valid at this scale.
Enlargement of maps beyond the scale of mapping can cause
misunderstanding of the detail of mapping and accuracy of soil
line placement. The maps do not show the small areas of
contrasting soils that could have been shown at a more detailed
scale.
Please rely on the bar scale on each map sheet for map
measurements.
Source of Map: Natural Resources Conservation Service
Web Soil Survey URL:
Coordinate System: Web Mercator (EPSG:3857)
Maps from the Web Soil Survey are based on the Web Mercator
projection, which preserves direction and shape but distorts
distance and area. A projection that preserves area, such as the
Albers equal-area conic projection, should be used if more
accurate calculations of distance or area are required.
This product is generated from the USDA-NRCS certified data as
of the version date(s) listed below.
Soil Survey Area: Larimer County Area, Colorado
Survey Area Data: Version 16, Sep 2, 2021
Soil map units are labeled (as space allows) for map scales
1:50,000 or larger.
Date(s) aerial images were photographed: Aug 11, 2018—Aug
12, 2018
The orthophoto or other base map on which the soil lines were
compiled and digitized probably differs from the background
imagery displayed on these maps. As a result, some minor
shifting of map unit boundaries may be evident.
Custom Soil Resource Report
23
Table—Hydrologic Soil Group
Map unit symbol Map unit name Rating Acres in AOI Percent of AOI
3 Altvan-Satanta loams, 0
to 3 percent slopes
B 19.8 66.5%
76 Nunn clay loam, wet, 1 to
3 percent slopes
C 9.9 33.5%
Totals for Area of Interest 29.7 100.0%
Rating Options—Hydrologic Soil Group
Aggregation Method: Dominant Condition
Component Percent Cutoff: None Specified
Tie-break Rule: Higher
Custom Soil Resource Report
24
References
American Association of State Highway and Transportation Officials (AASHTO).
2004. Standard specifications for transportation materials and methods of sampling
and testing. 24th edition.
American Society for Testing and Materials (ASTM). 2005. Standard classification of
soils for engineering purposes. ASTM Standard D2487-00.
Cowardin, L.M., V. Carter, F.C. Golet, and E.T. LaRoe. 1979. Classification of
wetlands and deep-water habitats of the United States. U.S. Fish and Wildlife
Service FWS/OBS-79/31.
Federal Register. July 13, 1994. Changes in hydric soils of the United States.
Federal Register. September 18, 2002. Hydric soils of the United States.
Hurt, G.W., and L.M. Vasilas, editors. Version 6.0, 2006. Field indicators of hydric
soils in the United States.
National Research Council. 1995. Wetlands: Characteristics and boundaries.
Soil Survey Division Staff. 1993. Soil survey manual. Soil Conservation Service.
U.S. Department of Agriculture Handbook 18. http://www.nrcs.usda.gov/wps/portal/
nrcs/detail/national/soils/?cid=nrcs142p2_054262
Soil Survey Staff. 1999. Soil taxonomy: A basic system of soil classification for
making and interpreting soil surveys. 2nd edition. Natural Resources Conservation
Service, U.S. Department of Agriculture Handbook 436. http://
www.nrcs.usda.gov/wps/portal/nrcs/detail/national/soils/?cid=nrcs142p2_053577
Soil Survey Staff. 2010. Keys to soil taxonomy. 11th edition. U.S. Department of
Agriculture, Natural Resources Conservation Service. http://
www.nrcs.usda.gov/wps/portal/nrcs/detail/national/soils/?cid=nrcs142p2_053580
Tiner, R.W., Jr. 1985. Wetlands of Delaware. U.S. Fish and Wildlife Service and
Delaware Department of Natural Resources and Environmental Control, Wetlands
Section.
United States Army Corps of Engineers, Environmental Laboratory. 1987. Corps of
Engineers wetlands delineation manual. Waterways Experiment Station Technical
Report Y-87-1.
United States Department of Agriculture, Natural Resources Conservation Service.
National forestry manual. http://www.nrcs.usda.gov/wps/portal/nrcs/detail/soils/
home/?cid=nrcs142p2_053374
United States Department of Agriculture, Natural Resources Conservation Service.
National range and pasture handbook. http://www.nrcs.usda.gov/wps/portal/nrcs/
detail/national/landuse/rangepasture/?cid=stelprdb1043084
25
United States Department of Agriculture, Natural Resources Conservation Service.
National soil survey handbook, title 430-VI. http://www.nrcs.usda.gov/wps/portal/
nrcs/detail/soils/scientists/?cid=nrcs142p2_054242
United States Department of Agriculture, Natural Resources Conservation Service.
2006. Land resource regions and major land resource areas of the United States,
the Caribbean, and the Pacific Basin. U.S. Department of Agriculture Handbook
296. http://www.nrcs.usda.gov/wps/portal/nrcs/detail/national/soils/?
cid=nrcs142p2_053624
United States Department of Agriculture, Soil Conservation Service. 1961. Land
capability classification. U.S. Department of Agriculture Handbook 210. http://
www.nrcs.usda.gov/Internet/FSE_DOCUMENTS/nrcs142p2_052290.pdf
Custom Soil Resource Report
26
NORTHERNENGINEERING.COM | 970.221.4158
FORT COLLINS | GREELEY
PRELIMINARY DRAINAGE REPORT: FISCHER PROPERTIES
APPENDIX
APPENDIX F
FEMA FIRMETTE
National Flood Hazard Layer FIRMette
0 500 1,000 1,500 2,000250
Feet
Ü
SEE FIS REPORT FOR DETAILED LEGEND AND INDEX MAP FOR FIRM PANEL LAYOUT
SPECIAL FLOOD
HAZARD AREAS
Without Base Flood Elevation (BFE)
Zone A, V, A99
With BFE or DepthZone AE, AO, AH, VE, AR
Regulatory Floodway
0.2% Annual Chance Flood Hazard, Areas
of 1% annual chance flood with average
depth less than one foot or with drainage
areas of less than one square mileZone X
Future Conditions 1% Annual
Chance Flood HazardZone X
Area with Reduced Flood Risk due to
Levee. See Notes.Zone X
Area with Flood Risk due to LeveeZone D
NO SCREEN Area of Minimal Flood Hazard Zone X
Area of Undetermined Flood HazardZone D
Channel, Culvert, or Storm Sewer
Levee, Dike, or Floodwall
Cross Sections with 1% Annual Chance
17.5 Water Surface Elevation
Coastal Transect
Coastal Transect Baseline
Profile Baseline
Hydrographic Feature
Base Flood Elevation Line (BFE)
Effective LOMRs
Limit of Study
Jurisdiction Boundary
Digital Data Available
No Digital Data Available
Unmapped
This map complies with FEMA's standards for the use of
digital flood maps if it is not void as described below.
The basemap shown complies with FEMA's basemap
accuracy standards
The flood hazard information is derived directly from the
authoritative NFHL web services provided by FEMA. This map
was exported on 3/16/2022 at 3:17 PM and does not
reflect changes or amendments subsequent to this date and
time. The NFHL and effective information may change or
become superseded by new data over time.
This map image is void if the one or more of the following map
elements do not appear: basemap imagery, flood zone labels,
legend, scale bar, map creation date, community identifiers,
FIRM panel number, and FIRM effective date. Map images for
unmapped and unmodernized areas cannot be used for
regulatory purposes.
Legend
OTHER AREAS OF
FLOOD HAZARD
OTHER AREAS
GENERAL
STRUCTURES
OTHER
FEATURES
MAP PANELS
8
B 20.2
The pin displayed on the map is an approximate
point selected by the user and does not represent
an authoritative property location.
1:6,000
105°6'11"W 40°34'30"N
105°5'33"W 40°34'2"N
Basemap: USGS National Map: Orthoimagery: Data refreshed October, 2020
NORTHERNENGINEERING.COM | 970.221.4158
FORT COLLINS | GREELEY
PRELIMINARY DRAINAGE REPORT: FISCHER PROPERTIES
APPENDIX
MAP POCKET
C 700 – HISTORIC DRAINAGE EXHIBIT
C 701 – DRAINAGE EXHIBIT
X X X XXXXX
XXXXXXXXXXX
XXXXXXXXX X X XELEC
D
D
D
D
D
D
STX STSTSTSTSTSTSTSTSTSTSTSTS
T STXX
X X X X
X X X
XXXXX
XXXXXXE
E
X X X X X X X X X X XX X X X XXXXXXXXXXXXXXXX
CONTROL
IRR
CONTROL
IRR
CONTROL
IRR
CONTROL
IRR
CONTROL
IRR
CONTROL
IRRCONTROL
IRRCONTROL
IRRCONTROL
IRR
XXXXXXXXXX
D
D
2.74 ac.
H1
2.65 ac.
H2
0.52 ac.
OS-2
0.93 ac.
OS-4
0.13 ac.
OS-1
h1
h2
0.40 ac.
OS-3
os-2
os-3
os-1
os-4 SOUTH SHIELDS STREETSPRIN
G
F
I
E
L
D
D
R
I
V
E
WESTWARD DRIVE
DEL MAR STREETLAKEWOOD
DRIVE
OWNER: POPPE, DAVID A.
1205 WESTWARD DR.
OWNER: MARX,
NICHOLAS J./ JILL B.
JARVIS
1209 WESTWARD DR.
OWNER: GRIFFITHS,
THOMAS
1213 WESTWARD DR.
OWNER: WAYFARE HOME
RENTAL, LLC.
1217 WESTWARD DR.
OWNER: BOWEN,
ZACHARY H.
1200 DEL MAR ST.
OWNER: LAJEUNESSE,
ROBERT M./ IRINA V.
1220 SPRINGFIELD DR.
OWNER: MIRANDA, JOHN
E./ YVONNE C.
1212 SPRINGFIELD DR.
OWNER: MARTINO, MARY
K.
1208 SPRINGFIELD DR.
OWNER: RIEUX SYLVIA
MARIANNE TRUST
1204 SPRINGFIELD DR.
OWNER: JRB HOLDINGS,
LLC.
1200 SPRINGFIELD DR.
OWNER: CARLSON, BEVERLY A.
1301 S. SHIELDS ST.
CALL 2 BUSINESS DAYS IN ADVANCE BEFORE YOU
DIG, GRADE, OR EXCAVATE FOR THE MARKING OF
UNDERGROUND MEMBER UTILITIES.
CALL UTILITY NOTIFICATION CENTER OF
COLORADO
Know what'sbelow.
before you dig.Call
R
NORTH
( IN FEET )
1 inch = ft.
Feet04040
40
80 120
SheetFISCHER PROPERTIESThese drawings areinstruments of serviceprovided by NorthernEngineering Services, Inc.and are not to be used forany type of constructionunless signed and sealed bya Professional Engineer inthe employ of NorthernEngineering Services, Inc.NOT FOR CONSTRUCTIONREVIEW SETENGINEERNGIEHTRONRNFORT COLLINS: 301 North Howes Street, Suite 100, 80521GREELEY: 820 8th Street, 80631970.221.4158northernengineering.comof 16
C 700HISTORIC DRAINAGE EXHIBIT 15
PROPOSED CONTOUR
PROPOSED STORM SEWER
PROPOSED SWALE
EXISTING CONTOUR
PROPOSED CURB & GUTTER
PROPERTY BOUNDARY
PROPOSED INLET
A
DESIGN POINT
FLOW ARROW
DRAINAGE BASIN LABEL
DRAINAGE BASIN BOUNDARY
PROPOSED SWALE SECTION
11
NOTES:
1.REFER TO THE PRELIMINARY DRAINAGE REPORT FOR FISCHER PROPERTIES BY
NORTHERN ENGINEERING, DATED APRIL 27, 2022 FOR ADDITIONAL INFORMATION.
A
LEGEND:
FOR DRAINAGE REVIEW ONLY
NOT FOR CONSTRUCTION
X X X XXXXX
XXXXXXXXXXX
XXXXXXXXX X X XD
D
D
D
D
D
STSTSTSTSTSTSTSTSTSTSTSTSTS
T STF.O.
F.O.
D
D
/ / / / / / / /0.52 ac.
OS-2
GGGGGGGGT
T
G G G G
E
E E E E E E E
EEEEEEEEEEE E
EEEE
FDC
EEEEENYLOP
L
A
S
T
DO NOT PO
L
L
U
T
E
DRAINS TOWATERWA
Y
S
DO NOT POLL
U
T
E
D
R
A
I
N
S
T
O
W
A
T
E
R
W
A
Y
S
NYLOPLAST
D
U
C
T
I
L
E
I
R
O
N
UDUD
UD UD UD
UD
NYLOP
L
A
S
T
DO NOT PO
L
L
U
T
E
DRAINS TOWATERWA
Y
S
DO NOT POLL
U
T
E
D
R
A
I
N
S
T
O
W
A
T
E
R
W
A
Y
S
NYLOPLAST
D
U
C
T
I
L
E
I
R
O
NUDUDUDUD DS
DS
DS
DS
DS DS
DS
DS
DS
DS
DS
DS DS
DS
DS
DS
DS
DS
DS
DS
DS
DS
DS DS
DS DS DS DS DS
DS
DS
DS
DS
DS
DS
DS
DS
DS
DS
DS
DS
DS
DS
DSDS
DS
NYLOP
LA
S
T
DO NOT PO
L
L
UT
E
DRAINS TO
WATERWA
Y
S
DO NOT POLL
U
T
E
D
R
A
I
NS
T
O
WA
T
E
RW
A
Y
S
NYLOPLAST
D
UC
T
I
L
E
IR
O
N
/ / / / / / / /2.24 ac.
200
100
2.31 ac.
300
0.40 ac.
OS-3
0.93 ac.
OS-4
0.13 ac.
OS-1
200
300
STORMTECH
CHAMBERS 2
PROPOSED
STORM DRAIN
PROPOSED
STORM DRAIN
PROPOSED 2'
CONCRETE
PAN
PROPOSED 2'
CONCRETE PAN
OS-2
OS-1
OS-3
OS-4
PROPOSED
UNDERDRAIN
PROPOSED
SIDEWALK
CULVERT
PROPOSED
UNDERDRAIN
5' SIDEWALK
5' SIDEWALK
SOUTH SHIELDS STREETSPRIN
G
F
I
E
L
D
D
R
I
V
E
WESTWARD DRIVE
DEL MAR STREETLAKEWOOD
DRIVE
EXISTING
STORM DRAIN
EXISTING
STORM DRAIN
9' UTILITY EASEMENT
9' UTILITY EASEMENT
DETENTION POND 3
EXISTING 24"
STORM DRAIN
LOT 3
LOT 4
LOT 1 LOT 2
LOT 5
LOT 7
LOT 6
LOT 9 LOT 8
BLOCK 1
BLOCK 1
TRACT B
AE,DE,UE
6' SIDEWALK
5' SIDEWALK
6' SIDEWALK30'
FL-FL57' ROW
OWNER: POPPE, DAVID A.
1205 WESTWARD DR.
OWNER: MARX,
NICHOLAS J./ JILL B.
JARVIS
1209 WESTWARD DR.
OWNER: GRIFFITHS,
THOMAS
1213 WESTWARD DR.
OWNER: WAYFARE HOME
RENTAL, LLC.
1217 WESTWARD DR.
OWNER: BOWEN,
ZACHARY H.
1200 DEL MAR ST.
OWNER: LAJEUNESSE,
ROBERT M./ IRINA V.
1220 SPRINGFIELD DR.
OWNER: MIRANDA, JOHN
E./ YVONNE C.
1212 SPRINGFIELD DR.
OWNER: MARTINO, MARY
K.
1208 SPRINGFIELD DR.
OWNER: RIEUX SYLVIA
MARIANNE TRUST
1204 SPRINGFIELD DR.
OWNER: JRB HOLDINGS,
LLC.
1200 SPRINGFIELD DR.
OWNER: CARLSON, BEVERLY A.
1301 S. SHIELDS ST.
100-YR WSEL
100-YR WSEL
0.84 ac.
100
PROPOSED 2'
CONCRETE PAN
0.04 ac.
OF-2
0.23 ac.
OF-1
DETENTION POND 1
UNDERGROUND
DETENTION POND 2.
RAIN GARDEN A
LID VOL. = 2,152 CU.FT.
LID WSEL = 5031.31
OF
CALL 2 BUSINESS DAYS IN ADVANCE BEFORE YOU
DIG, GRADE, OR EXCAVATE FOR THE MARKING OF
UNDERGROUND MEMBER UTILITIES.
CALL UTILITY NOTIFICATION CENTER OF
COLORADO
Know what'sbelow.
before you dig.Call
R
NORTH
( IN FEET )
1 inch = ft.
Feet04040
40
80 120
SheetFISCHER PROPERTIESThese drawings areinstruments of serviceprovided by NorthernEngineering Services, Inc.and are not to be used forany type of constructionunless signed and sealed bya Professional Engineer inthe employ of NorthernEngineering Services, Inc.NOT FOR CONSTRUCTIONREVIEW SETof 16
PROPOSED CONTOUR
PROPOSED STORM SEWER
PROPOSED SWALE
EXISTING CONTOUR
PROPOSED CURB & GUTTER
PROPERTY BOUNDARY
PROPOSED INLET
A
DESIGN POINT
FLOW ARROW
DRAINAGE BASIN LABEL
DRAINAGE BASIN BOUNDARY
PROPOSED SWALE SECTION
11
NOTES:
1.REFER TO THE PRELIMINARY DRAINAGE REPORT FOR FISCHER PROPERTIES BY
NORTHERN ENGINEERING, DATED AUGUST 24, 2022 FOR ADDITIONAL INFORMATION.
A
LEGEND:
C 701DRAINAGE EXHIBIT 16
FOR DRAINAGE REVIEW ONLY
NOT FOR CONSTRUCTION
Rational Flow Summary | Developed Basin Flow Rates
BASIN
TOTAL
AREA
(acres)
Tc2
(min)
Tc100
(min)
C2 C100 Q2
(cfs)
Q100
(cfs)
100 0.60 6.9 6.9 0.63 0.69 0.99 3.76
200 1.83 5.0 5.0 0.83 0.89 4.33 16.20
300 2.64 6.5 6.5 0.61 0.70 4.18 16.74
OF-1 0.23 7.4 7.4 0.33 0.39 0.19 0.77
OF-2 0.04 5.0 5.0 0.70 0.75 0.08 0.31
OS-1 0.13 5.0 5.0 0.81 0.86 0.31 1.13
OS-2 0.52 10.8 10.8 0.44 0.50 0.49 1.96
OS-3 0.40 8.8 8.8 0.43 0.49 0.40 1.60
OS-4 0.93 10.4 10.4 0.33 0.39 0.68 2.79
POND SUMMARY TABLE
Pond ID
Extended
Detention
WQCV (CF)LID WQCV (CF)
100-Yr.
Detention Vol.
(CF)
Total Volume
(CF)
100-Yr.
Detention
WSEL(Ft)
Peak Release
(cfs)
Pond 1 546.00 N/A 2,832.00 3,378.00 5,030.03 0.40
Pond 2 N/A 2,209.00 9,843.00 12,052.00 5,029.40 1.99
Pond 3 N/A 2,213.00 16,562.00 18,775.00 5,031.27 1.10
LID Site Summary - New Impervious Area
Total Area of Current Development 232,598 ft2
Total On-site Impervious Area 143,631 ft2
75% Required Minimum Area to be Treated by LID 107,723 ft2
Total On-site Impervious Area Treated by LID 127,813 ft2
Percent On-site Impervious Treated by LID 88.99%
Additional Off-site Impervious Area Treated by LID 9,176 ft2
Percent Total Impervious Area Treated by LID 95.38%
Total Impervious Area Treated by Traditional WQ 13,385 ft2
Percent Impervious Treated by Traditional Water Quality 9.32%
Percent Impervious Area Treated by Traditional WQ or LID 104.70%