HomeMy WebLinkAboutVOICE OF TRUTH TABERNACLE - PDP200011 - SUBMITTAL DOCUMENTS - ROUND 1 - DRAINAGE REPORT
TABLE OF CONTENTS
Title Page
Engineer’s certification statement
Vicinity Map
Table of Contents
I. INTRODUCTION: ........................................................................................................ 1
II. GENERAL LOCATION AND DESCRIPTION......................................................... 1
A. Property location ........................................................................................................ 1
B. Description of Property .............................................................................................. 1
III. DRAINAGE BASINS AND SUB-BASINS .................................................................. 2
A. Major Basin Description ............................................................................................ 2
B. Sub-Basin Description ............................................................................................... 3
C. Historic Conditions .................................................................................................... 3
IV. DRAINAGE DESIGN CRITERIA .............................................................................. 3
A. Regulations…………………………………………………………………………..3
B. Development Criteria Reference and Constraints……………………………………4
C. Hydrologic Criteria…………………………………………………………………..4
D. Hydraulic Criteria…………………………………………………………………....4
V. DRAINAGE FACILITY DESIGN ............................................................................... 4
A. General Concept......................................................................................................... 4
B. Specific Details – Runoff ........................................................................................... 5
C. Specific Details – Detention ...................................................................................... 5
VI. WATER QUALITY ....................................................................................................... 6
A. General Concepts……………………………………………………………………6
VII. EROSION CONTROL – STORMWATER MANAGEMENT ................................. 6
A. Specific Details – Erosion/Sediment Controls ........................................................... 6
B. Potential Sources of Pollution/Materials and Site Management................................ 6
C. Erosion Control Security Deposit .............................................................................. 6
VIII.LOW IMPACT DEVELOPMENT (LID) ................................................................... 6
IX. CONCLUSIONS ............................................................................................................ 7
A. Compliance with Standards ....................................................................................... 7
B. Drainage Concept....................................................................................................... 8
X. VARIANCE REQUEST ................................................................................................ 8
A. Variance from City of Fort Collins Requirements ..................................................... 8
XI. REFERENCES ............................................................................................................... 9
APPENDIX I
Hydrology Summary Table
Detention and WQCV Design
LID Design
APPENDIX II
Topo exhibit for historic (pre-developed) conditions (provided by the City of Fort Collins)
Flood Insurance Rate Map (FIRM) Map Number 08069C0977G; Panel 977 of 1420; map dated June 17,
2008
APPENDIX III
Historic Drainage Plan
Drainage Plan (Ultimate)
Sediment / Erosion Control and Water Quality Plan (Interim)
Page 1
Drainage, Sediment/Erosion Control, and Stormwater Quality Report
Voice of Truth Tabernacle Subdivision; Fort Collins, Colorado
I. INTRODUCTION:
1. This report presents the pertinent data, methods, assumptions, references and
calculations used in analyzing and preparing the final drainage, erosion control, and
water quality design for Voice of Truth Tabernacle Subdivision.
2. Voice of Truth Tabernacle Subdivision is a replat of Tract Two, Dix Amended Plat.
3. All runoff from Voice of Truth Tabernacle Subdivision has been historically directed
east to the east end of Dix Amended Plat, then further east to the existing Burlington
Northern railroad tracks east of the site. Runoff is then conveyed under the existing
railroad tracks in a 33"x26" CMP Arch culvert. Runoff then turns south through
Buderus Exemption and under Vine Drive through a 24" diameter CMP culvert to the
East Ridge Fourth development. The East Ridge Drainage Report does not appear to
consider the offsite flows under Vine Drive.
II. GENERAL LOCATION AND DESCRIPTION
A. Property location
1. Voice of Truth Tabernacle Subdivision is located in the southeast 1/4 of Section
5, Township 7 North, and Range 68 West of the 6th P.M., Fort Collins, Colorado.
2. The property is bounded by Tract One, Dix Amended Plat on the south. There is
an existing residence on Tract One. The property is bounded by Outlot A, Dix
Amended Plat on the north and east. Tract A, Dix Amended Plat is currently
undeveloped. The property is bounded by North Timberline Road on the west.
3. More specifically, Voice of Truth Tabernacle Subdivision is located on the east
side of North Timberline Road directly across from Waterfield Fourth Filing.
4. Refer to the vicinity map located near the beginning of this report.
B. Description of Property
1. The Voice of Truth Tabernacle Subdivision is a 2.80-acre tract with an existing
residence and a small existing barn structure.
2. The Voice of Truth Tabernacle Subdivision will consist of two (2) lots. One (1)
lot is defined for the existing residence and the other for an 11,580 square foot
church. The first phase of the church will be 6,000 square feet. The existing barn
will be on the church lot and converted to a crafts room.
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Drainage, Sediment/Erosion Control, and Stormwater Quality Report
Voice of Truth Tabernacle Subdivision; Fort Collins, Colorado
3. Timberline Road is currently a 2-lane road. It is a designated a 4-lane arterial.
Although Timberline Road will not be improved to 4-lane arterial conditions at
this time, the entire site is designed for Timberline Road ultimate design
conditions and right-of-way will be dedicated for a 4-lane arterial.
III. DRAINAGE BASINS AND SUB-BASINS
A. Major Basin Description
1. The entire site is located in the Dry Creek Basin as delineated on the City of Fort
Collins Stormwater Basin Map (Figure 2).
Figure 2: City of Fort Collins Stormwater Basin Map
2. Onsite detention is required for the runoff volume difference between the 100-
year developed inflow rate and the 2-year historic release rate. In the Dry Creek
Basin the two year historic release rate is 0.2 cfs/acre.
3. All runoff from Voice of Truth Tabernacle Subdivision has been historically
directed east to the east end of Dix Amended Plat, then further east to the existing
railroad tracks east of the site in the Ditch Lateral No. 10. Runoff is then conveyed
under the existing railroad tracks in the Ditch Lateral No. 10, then turns south
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Drainage, Sediment/Erosion Control, and Stormwater Quality Report
Voice of Truth Tabernacle Subdivision; Fort Collins, Colorado
through Buderus Exemption and under Vine Drive to the East Ridge Fourth
development.
B. Sub-Basin Description
1. The Voice of Truth Tabernacle Subdivision site basin contains three (3) onsite
sub-basins and three (3) offsite sub-basins with a total basin area of 3.77 acres.
a. Developed runoff is directed to a detention pond at the Northeast corner of
the site.
b. Detention pond outfall is released to the general historic path to the east.
Due to the flat nature of the property to the east, a storm pipe is required.
C. Historic Conditions
1. All runoff from Voice of Truth Tabernacle Subdivision has been historically
directed east to the east end of Dix Amended Plat, then further east to the existing
Burlington Northern railroad tracks east of the site. Runoff is then conveyed
under the existing railroad tracks in a 33"x26" CMP Arch culvert. Runoff then
turns south through Buderus Exemption and under Vine Drive through a 24"
diameter CMP culvert to the East Ridge Fourth development. The East Ridge
Drainage Report does not appear to consider the offsite flows under Vine Drive.
a. Both properties to the east that accept historic runoff from Voice of Truth
Tabernacle Subdivision are owned by Timbervine Farm Limited Partnership
(Registered Agent: George A. Holter).
b. Refer to topo exhibit attached with this report for historic (pre-developed)
conditions.
IV. DRAINAGE DESIGN CRITERIA
A. Regulations
1. Stormwater management improvements are designed in compliance with the
requirements of the City of Fort Collins Stormwater Criteria Manual adopted
December 2011. (Manual). The Manual incorporates most of the Urban Storm
Drainage Criteria Manual (USDCM) with amendments that are unique to Fort
Collins.
2. The latest versions of the USDCM software were used for runoff calculations.
3. City of Fort Collins rainfall distributions were used for all hydrologic
calculations.
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Drainage, Sediment/Erosion Control, and Stormwater Quality Report
Voice of Truth Tabernacle Subdivision; Fort Collins, Colorado
B. Development Criteria Reference and Constraints
1. Generally, development within the site will not redefine grades along the property
boundaries.
2. Timberline Road is currently an existing 2-lane road on the west side of this site.
It is a designated a 4-lane arterial. Although Timberline Road will not be
improved to 4-lane arterial conditions at this time, the entire site is designed for
Timberline Road ultimate design conditions and right-of-way will be dedicated
for a 4-lane arterial.
a. The Timberline Road 4-lane arterial design has been coordinated with the
North Timberline Road design for Waterfield Fourth Filing by Northern
Engineering Services.
C. Hydrologic Criteria
1. Rational Method - The Rational Method was used to determine peak runoff rates
at design points for the sizing of swales, storm sewers and street capacities for
both the Minor Design Storm (2-year) and the Major Design Storm (100-year).
a. Percentage imperviousness values were taken from Table RO-3–
Recommended Percentage Imperviousness Values (See Appendix II).
b. Rational coefficients determined per Manual methods using a hydrologic
soil group of Type C for the site. The 100-year coefficients were multiplied
by the Fort Collins required frequency factor of 1.25.
D. Hydraulic Criteria
1. Culvert analysis will be conducted utilizing HY8 software implementing Federal
Highway Administration (FHWA) HDS-5 methodology.
2. Storm sewer hydraulic and energy gradeline (HGL\EGL) analyses will be
conducted using Stormwater Studio by Hydrology Studio implementing the latest
HEC-22 3
rd
Edition junction loss methodology.
V. DRAINAGE FACILITY DESIGN
A. General Concept
1. The storm drainage system is designed to safely convey ultimate condition
developed storm flows by sheet flow, concentrated gutter flow and storm sewer
flow to the proposed detention pond located at the Northeast corner of the site.
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Drainage, Sediment/Erosion Control, and Stormwater Quality Report
Voice of Truth Tabernacle Subdivision; Fort Collins, Colorado
2. Detention fall outfall flows will be conveyed easterly via storm sewer to a point
where runoff may daylight and continue along the historic path.
B. Specific Details – Runoff
1. The Rational Method was used to determine peak runoff rates for the 2-year and
100-year design storm events at the site design points for the sizing of drainage
structures. Please see the Rational Method coefficients calculated runoff for the
design basins in the runoff section of Appendix I.
a. Design Point 1 - represents the Rational Method routed flow for the project
site in a swale to an entry point to the detention pond. Q2 = 0.44 cfs and Q100
= 1.95 cfs.
b. Design Point 2 - represents the Rational Method routed flow for the project
site from the parking lot to an entry point to the detention pond. Q2 = 1.81
cfs and Q100 = 8.78 cfs.
c. Design Point 3 - represents the Rational Method routed flow for the project
site to the detention pond outlet structure. Q2 = 2.74 cfs and Q100
= 11.98
cfs.
d. Design Point 4 – represents the Rational Method routed flow to the North
Timberline Road gutter system. Q2 = 0.31 cfs and Q100
= 1.39 cfs.
C. Specific Details – Storm Sewer
1. There is no proposed storm sewer for the project.
D. Specific Details – Detention
1. The entire detention requirement for the new developed area for Voice of Truth
Tabernacle Subdivision is accommodated on Lot 1, Voice of Truth Tabernacle
Subdivision. The total required detention volume is 0.272 acre-feet at a water
surface elevation of 4978.87.
2. The water quality pond will be placed in the base of the detention pond. The water
quality volume requirement has been added to the actual 100-year storm detention
requirement. The required water quality control volume for a 12-hour release rate
is 0.031 acre-feet at a water surface elevation of 4977.33.
3. The emergency overflow weir crest is twelve feet (12') wide and is set at an
elevation of 4979.50. The weir is designed to pass 11.98 cfs (100-year developed
flow) at an operating head water surface elevation of 4979.50 and an assumed
plugged orifice. The top of berm for the pond is at elevation 4980.03.
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Drainage, Sediment/Erosion Control, and Stormwater Quality Report
Voice of Truth Tabernacle Subdivision; Fort Collins, Colorado
4. The detention pond outlet structure will be a Type-2 style structure with a box
structure at the bottom of the pond accommodating the water quality orifice plate
and screen plate at the front of the box structure and the restriction plate to control
release to the 2-year historic rate at the back of the structure. A pipe will extend
from this structure to discharge into the Larimer/Weld County Canal.
5. For additional information, please refer to Detention and Water Quality
calculations in Appendix I.
VI. WATER QUALITY
A. General Concept
1. The water quality volume will be placed in the base of the detention pond. The
required water quality control volume for a 12-hour release rate is 0.031 acre-feet
at a water surface elevation of 4977.33.
VII. EROSION CONTROL – STORMWATER MANAGEMENT
A. Specific Details – Erosion/Sediment Controls
1. Please refer to Erosion Control Report for Voice of Truth Tabernacle
Subdivision; Fort Collins, Colorado; Shear Engineering Corporation; report dated
July 2020
B. Potential Sources of Pollution/Materials and Site Management
1. Please refer to Erosion Control Report for Voice of Truth Tabernacle
Subdivision; Fort Collins, Colorado; Shear Engineering Corporation; report dated
July 2020
C. Erosion Control Security Deposit
1. Please refer to Erosion Control Report for Voice of Truth Tabernacle
Subdivision; Fort Collins, Colorado; Shear Engineering Corporation; report dated
July 2020
VIII. LOW IMPACT DEVELOPMENT (LID)
1. The Project benefits from a site layout that disconnects the new impervious area.
The Project drains in general across the site from the west and south to the north.
The majority of the new impervious area drains to a sand filter LID facility, then
to a detention pond for extended detention water quality treatment and 100-yr
stormwater volume attenuation. A small portion of the new impervious area
drains to a grass swale, then to the detention pond.
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Drainage, Sediment/Erosion Control, and Stormwater Quality Report
Voice of Truth Tabernacle Subdivision; Fort Collins, Colorado
2. The drainage design for the project follows the Four Step Process to Minimize
Adverse Impacts of Urbanization as outlined in the USDCM. The USDCM
software UD-BMP v. 3.05 was utilized to select and then analyze the benefits of
the implemented LID practices and BMP’s.
a. Step 1: Employ Runoff Reduction Practices
i. A Sand Filter implementing a 12-hr detention time is located at design
point 2 at the end of the parking area. The Sand Filter calculations are
found in Appendix I.
b. Step 2. Implement BMPs That Provide a Water Quality Capture Volume
with Slow Release
i. The site detention pond outlet structure provides for a 40-hour extended
detention treatment of the water quality control volume.
c. Step 3. Stabilize Streams
i. There are no streams within the project.
d. Step 4. Implement Site Specific and Other Source Control BMPs
i. Best practices regarding the application of fertilizers and other
landscape treatments should be encouraged.
3. LID calculations are presented in Appendix I.
IX. CONCLUSIONS
A. Compliance with Standards
1. The grading and drainage design for Voice of Truth Tabernacle Subdivision
complies with the requirements of the City of Fort Collins Storm Drainage Design
Criteria Manual.
2. The erosion control measures for Voice of Truth Tabernacle Subdivision
complies with the requirements of the City of Fort Collins Storm Drainage Design
Criteria Manual.
3. Water quality control measures generally conform to the design criteria outlined
in the most current Urban Storm Drainage Criteria Manual Volume 3, Best
Management Practices; Urban Drainage and Flood Control District, Denver,
Colorado
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Drainage, Sediment/Erosion Control, and Stormwater Quality Report
Voice of Truth Tabernacle Subdivision; Fort Collins, Colorado
B. Drainage Concept
1. The drainage design for Voice of Truth Tabernacle Subdivision will be adequate
to safely convey onsite and offsite flows through the development while
implementing LID treatment techniques.
X. VARIANCE REQUEST
A. Variance from City of Fort Collins Requirements
1. A variance is requested for detention pond freeboard protection requirements for
an existing shed that was on the site prior to purchase of the property.
2. A variance is requested regarding the calculated required Sand Filter treatment
volume of 922 cubic feet.
a. The natural topography of the area contributes to the project site having an
extremely limited vertical drop to work with for creating subterranean
drainage structures.
b. The required depth to accommodate 922 cubic feet could not be created in
the sand filter because the drain pipe must drop down 2 feet below the filter.
The resultant sand filter configuration accommodates 434 cubic feet.
c. The City requested that this site also retain 50% of the 40hr WQCV for the
new impervious by EDB in the pond. To offset the lower sand filter volume
capacity, the detention pond facility has been designed to accommodate a
higher standard by detaining and treating 100% of the WQCV in the 40-hr
extended detention basin.
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Drainage, Sediment/Erosion Control, and Stormwater Quality Report
Voice of Truth Tabernacle Subdivision; Fort Collins, Colorado
XI. REFERENCES
A. City of Fort Collins Stormwater Criteria Manual; City of Fort Collins,
adopted December 2018 with Ordinance 159, 2018
B. Urban Storm Drainage Criteria Manual Volume 1; Urban Drainage and Flood Control
District, Denver, Colorado, September 1969 (updated January 2016)
C. Urban Storm Drainage Criteria Manual Volume 2; Urban Drainage and Flood Control
District, Denver, Colorado, September 1969 (updated January 2016)
D. Urban Storm Drainage Criteria Manual Volume 3, Best Management Practices; Urban
Drainage and Flood Control District, Denver, Colorado, September, 1992 (updated
November 2010)
E. Flood Insurance Rate Map (FIRM) Map Number 08069C0982F; Panel 982 of 1420;
map dated December 19, 2006
F. Erosion Control Report for Voice of Truth Tabernacle Subdivision; Fort Collins,
Colorado; Shear Engineering Corporation; report dated July 2020
HYDROLOGY SUMMARY TABLES
Design Point Basins Area (ac) %Imp C2
C100 Q
2 (cfs) Q100
(cfs)
1 E1, O1, O2 3.803 6.3% 0.18 0.23 1.43 6.26
2 E2 0.321 2.0% 0.15 0.19 0.10 0.44
3 E3 0.220 19.0% 0.30 0.37 0.14 0.61
Existing Condition Hydrology Summary Table
Voice of Truth Tabernacle Subdivision
Fort Collins, CO
11:30 AM
4/3/2020
Basin
No.
Total Area
(ft2)
Total
Area (ac.)
Paved Area
(ft2)
C = 0.95
100% IMP
Roof
(ft2)
C = 0.95
90% IMP
Lawns, Sandy Soil,
Avg Slope 2-7%
Area (ft2)
C = 0.15
2% IMP Composite C Composite C100
Percent
Impervious (%)
Net Impervious
Area (ft2)
Cummulative Net
Impervious Area (ft2)
Cummulative Net
Site %IMP
E1 104,120 2.390 1,094 3,843 99,183 0.19 0.23 6.3% 6,536 6,536 76%
E2 13,971 0.321 0 0 13,971 0.15 0.19 2.0% 279 6,816 79%
E3 9,589 0.220 799 967 7,823 0.30 0.37 19.0% 1,826 8,641 100%
Site 127,679 2.931 1,893 4,810 0.19 0.24 6.8% 8,641
Offsite
O1 32,459 0.745 0 1,354 31,105 0.18 0.23 5.7% 1,841 1,841 76%
O2 29,101 0.668 0 0 29,101 0.15 0.19 2.0% 582 2,423 100%
61,560 1.413 0.17 0.21 3.9% 2,423
Runoff Coefficents and Site Percent Imperviousness Calculations
Voice of Truth Tabernacle Subdivision
Fort Collins, CO
Existing Conditions
11:33 AM
4/3/2020
Notes
Design Basins Area C*
Cf
(2yr)
Cf
(100yr) C2
C100 LS
ti
(2yr)
ti
(100yr) LSVt
L L tL
L tL
Compute
d
Tc
Max
Tc
Final
Tc
Computed
Tc
Max
Tc
Final
Tc i
2 i100
Q2 Q
100 Minor Major
Point (ac) (ft) (%) (min) (min) (ft) (ft/ft) (ft/s) (min) (ft) (min) (ft) (min) (min) (min) (min) (min) (min) (min) in/hr in/hr (cfs) (cfs) (cfs) (cfs)
1 E1, O1, O2 3.803 0.18 1.0 1.25 0.18 0.23 267 2.88 19.8 18.8 0 0.000 0.0 0.0 0.0 0.0 0.0 0.0 19.8 11.5 11.5 18.8 11.5 11.5 2.09 7.29 1.43 6.26
2 E2 0.321 0.15 1.0 1.25 0.15 0.19 261 1.90 23.2 22.3 0 0.000 0.0 0.0 0.0 0.0 0.0 0.0 23.2 11.5 11.5 22.3 11.5 11.5 2.09 7.30 0.10 0.44
3 E3 0.220 0.30 1.0 1.25 0.30 0.37 126 2.37 12.6 11.5 0 0.000 0.0 0.0 0.0 0.0 0.0 0.0 12.6 10.7 10.7 11.5 10.7 10.7 2.15 7.51 0.14 0.61
* Weighted-area average method used to calculate composite C for design points that have multiple tributary basins.
Rational Method
Existing Conditions
Voice of Truth Tabernacle Subdivision
Fort Collins, CO
Sub-Basin Data Initial Overland Time Gutter Flow Tc 2yr T
c 100yr Intensity Runoff
Street
Channel Flow Pipe Flow Capacity
11:42 AM
4/3/2020
Design Point Basins Area (ac) %Imp C2
C100 Q
2 (cfs) Q100
(cfs)
1 S1 0.321 41.8% 0.51 0.63 0.44 1.95
2 S2, O1-a 1.302 52.9% 0.58 0.72 1.81 8.78
3 S1,S2,S3,O1-a,O1-b,O2 3.772 26.6% 0.36 0.45 2.74 11.98
4 S4 0.352 22.5% 0.32 0.40 0.31 1.39
Proposed Condition Hydrology Summary Table
Voice of Truth Tabernacle
Fort Collins, CO
11:31 AM
4/3/2020
Basin
No.
Total Area
(ft
2
)
Total
Area (ac.)
Paved
Area
(ft
2
)
C = 0.95
100% IMP
Roof
(ft
2
)
C = 0.95
90% IMP
Lawns, Sandy Soil,
Avg Slope 2-7%
Area (ft
2
)
C = 0.15
2% IMP Composite C Composite C100
Percent
Impervious (%)
Net Impervious Area
(ft2
)
Cummulative Net
Impervious Area (ft2
)
Cummulative
Net Site %IMP
S1 13,978 0.321 606 5,649 7,723 0.51 0.63 41.8% 5,845 5,845 13%
S2 46,382 1.065 23,296 6,821 18,250 0.68 0.84 64.2% 29,800 35,645 80%
S3 42,401 0.973 1,433 3,843 37,125 0.25 0.31 13.3% 5,634 41,279 92%
S4 15,345 0.352 2,345 967 12,033 0.32 0.40 22.5% 3,456 44,735 100%
Site 118,106 2.711 0.46 0.57 37.9% 44,735
Basin
No.
Total
Impervious
Area
(ft
2
)
Total
Area (ac.)
Paved
Area
(ft
2
)
C = 0.95
100% IMP
Notes
Design Basins Area C*
Cf
(2yr)
Cf
(100yr) C2
C100 LS
ti
(2yr)
ti
(100yr) LSVtL
L tL L tL
Compute
d
Tc
Max
Tc
Final
Tc
Compute
d
Tc
Max
Tc
Final
Tc i
2 i100
Q2 Q
100 Minor Major
Point (ac) (ft) (%) (min) (min) (ft) (ft/ft) (ft/s) (min) (ft) (min) (ft) (min) (min) (min) (min) (min) (min) (min) in/hr in/hr (cfs) (cfs) (cfs) (cfs)
1 S1 0.321 0.51 1.0 1.25 0.51 0.63 9 5.00 1.9 1.5 0 0.000 0.0 0.0 539.0 4.1 0.0 0.0 6.0 13.0 6.0 5.6 13.0 5.6 2.67 9.58 0.44 1.95
2 S2, O1-a 1.302 0.58 1.0 1.25 0.58 0.72 145 4.31 7.2 5.2 0 0.000 0.0 0.0 104.0 0.8 0.0 0.0 8.0 11.4 8.0 6.0 11.4 6.0 2.40 9.30 1.81 8.78
3 S1,S2,S3,O1-a,O1-b,O2 3.772 0.36 1.0 1.25 0.36 0.45 246 4.86 12.8 11.2 0 0.000 0.0 0.0 206.0 7.1 0.0 0.0 19.9 12.5 12.5 18.4 12.5 12.5 2.01 7.04 2.74 11.98
4 S4 0.352 0.32 1.0 1.25 0.32 0.40 17 2.00 4.8 4.3 278 0.012 4.4 1.0 0.0 0.0 0.0 0.0 5.8 11.6 5.8 5.3 11.6 5.3 2.71 9.75 0.31 1.39
* Weighted-area average method used to calculate composite C for design points that have multiple tributary basins.
Design
Lt
S
Rt
SW Slope "n" Y L V tL
Dia "n" S L V
Point (ft/ft) (ft/ft) (ft) (ft/ft) (ft) (ft) (ft/s) (min) (ft) (ft/ft) (ft)(ft/s)
1 3.0 3.0 1.0 0.014 0.035 0.49 539 2.22 4.1 n/a n/a n/a 0.0 0.0
2 50.0 50.0 2.0 0.016 0.016 0.13 104 2.09 0.8 n/a n/a n/a 0.0 0.0
3 50.0 50.0 1.0 0.005 0.060 0.28 206 0.48 7.1 n/a n/a n/a 0.0 0.0
3 n/a 0.0 0.0 0.000 0.000 n/a 0 0.00 0.0 n/a n/a n/a 0.0 0.0
Tc 100yr Intensity Runoff
Street
Capacity
Travel Time Parameters
Channel Pipe
Rational Method
Proposed Conditions
Voice of Truth Tabernacle Subdivision
Fort Collins, CO
Sub-Basin Data Initial Overland Time Gutter Flow Channel Flow Pipe Flow Tc
2yr
11:55 AM
4/3/2020
DETENTION AND WQCV DESIGN
FAA- Fort Collins100 Year
C = 0.93
Cf = 1.25
C100 = 1.00
Area = 0.888 ac
Release Rate = 0.18 cfs
Duration TIME INTENSITY Q 100 Runoff Release Required Required
(min) Cumulative (s)100 year (in/hr) (cfs) Volume (ft3)Cumulative Total (ft3)Detention (ft3)Detention (ac-ft)
0 0 0 0.0 0 0 0 0
5 300 9.95 8.84 2,651 53 2,597 0.060
10 600 7.72 6.86 4,113 107 4,007 0.092
15 900 6.52 5.79 5,211 160 5,051 0.116
20 1200 5.60 4.97 5,967 213 5,754 0.132
25 1500 4.98 4.42 6,633 266 6,367 0.146
30 1800 4.52 4.01 7,225 320 6,905 0.159
35 2100 4.08 3.62 7,608 373 7,235 0.166
40 2400 3.74 3.32 7,971 426 7,544 0.173
45 2700 3.46 3.07 8,296 480 7,816 0.179
50 3000 3.23 2.87 8,605 533 8,072 0.185
55 3300 3.03 2.69 8,879 586 8,293 0.190
60 3600 2.86 2.54 9,143 639 8,503 0.195
65 3900 2.71 2.41 9,385 693 8,693 0.200
70 4200 2.59 2.30 9,660 746 8,914 0.205
75 4500 2.48 2.20 9,910 799 9,111 0.209
80 4800 2.38 2.11 10,145 852 9,292 0.213
85 5100 2.29 2.03 10,371 906 9,465 0.217
90 5400 2.21 1.96 10,597 959 9,638 0.221
95 5700 2.13 1.89 10,781 1,012 9,769 0.224
100 6000 2.06 1.83 10,976 1,066 9,910 0.228
105 6300 2.00 1.78 11,189 1,119 10,070 0.231
110 6600 1.94 1.72 11,370 1,172 10,198 0.234
115 6900 1.89 1.68 11,580 1,225 10,355 0.238
120 7200 1.84 1.63 11,764 1,279 10,486 0.241
ft3 ac-ft
10,486 0.241
WQCV 1368 0.0314
100yr + WQCV 11,853 0.2721
Required Detention
DETENTION POND SIZING
100-Year Storm Event
Voice of Truth Tabernacle Subdivision
Fort Collins, CO
Detention Pond
Page 1
Project Name: Voice of Truth Tabernacle Subdivision
Location: Fort Collins, CO
Equation 3-1:
12 hr 40 hr
a = 0.8 1.0
I = 0.59 0.93 %/100
Area = 0.223 0.888 acres
WQCV = 0.19 0.42 in
WQCV(Area*Depth) = 151 1,368 ft3
0.003 0.031 ac-ft
Water Quality Control Volume
Elevation (ft) Stage (ft) Area (ft2) Area (ac)
l
Storage
Cumulative
Storage (ft3)
Cumulative
Storage (ac-ft)
4,976.50 0.00 0 0.000 0.000 0 0.000
4,977.00 0.50 952 0.022 159 159 0.004
4,978.00 1.50 7,417 0.170 3,675 3,834 0.088
4,979.00 2.50 11,210 0.257 9,248 13,083 0.300
4,980.03 3.53 17,069 0.392 14,458 27,541 0.632
4978.87 100 year Volume Required = 0.272
4977.33 WQ Design Volume Required = 0.031
Freeboard Elev = 4980.03
100 yr 99% Drained = 4976.66
100-year + WQCV WSEL =
WQCV WSEL =
Voice of Truth Tabernacle Subdivision
Fort Collins, CO
Detention Pond Volume Rating Curve
10:55 AM
4/12/2020
Stage (ft)
Pond Invert Elev = 4976.50 0
WQCV Elev = 4977.33 0.83
100-Yr WSEL = 4978.87 2.37
Co = 0.61
H(WQCV) 0.83
H/3 = 0.28
H(100YR) = 2.37
Invert Elev Diameter (in) Diameter (ft) Centroid Elev Top of Orifice Elev Orifice Area (in2)
Orifice 1 4976.50 0.70 0.0583 4976.53 4976.56 0.385
Orifice 2 N/A 0.00 N/A N/A N/A N/A
Orifice 3 N/A 0.00 N/A N/A N/A N/A
Invert Elev = 4976.50 Diameter (ft) = 1.25
Diameter (in) = 2.10 0.175 ft Up Invert Elev (ft) = 4976.50
Co = 0.61 Slope (ft/ft) = 0.005
Length (ft) = 273.53
Dn Invert Elev (ft) = 4975.13
Manning's n = 0.013
Tailwater Elev (ft) = 4975.94
Lower Crest Elev Upper Crest Elev Theta Inside Width (ft) Inside Length (ft) Open Area Ratio (n) CD
4977.35 4978.35 0.24 4 4 0.73 0.62
Elevation (ft) Stage (ft)
Cumulative
Storage (cf) Orifice 1 (cfs) Orifice 2 (cfs) Orifice 3 (cfs)
Sum of
Orifice Flow
(cfs) Riser Capacity (cfs)
100yr Orifice
Plate
Capacity (cfs)
100yr Orifice Plate
HGL (ft)
HGL
Culvert
Barrel (ft)
Structure HGL
(ft)
Emergency
Overflow Weir (cfs) Total Outflow (cfs)Drain Time (hrs) Notes
4976.50 0.00 0 0.0000 0.0000 0.0000 0.0000 0.000 0.0000 4976.50 4976.50 4976.50 0.00 0.000 0.0
4977.00 0.50 159 0.0088 0.0000 0.0000 0.0088 0.000 0.0756 4976.55 4976.54 4976.55 0.00 0.009 10.0
4977.33 0.83 1,368 0.0115 0.0000 0.0000 0.0115 0.000 0.1013 4976.56 4976.55 4976.56 0.00 0.011 43.1 WQCV
4977.35 0.85 1,445 0.0116 0.0000 0.0000 0.0116 0.000 0.1028 4976.56 4976.55 4976.56 0.00 0.012 44.9
4978.00 1.50 3,834 0.0000 0.0000 0.0000 0.0000 7.711 0.1368 4978.00 4976.65 4978.00 0.00 0.137 53.9
4978.87 2.37 11,853 0.0000 0.0000 0.0000 0.0000 41.544 0.1746 4978.87 4976.67 4978.87 0.00 0.175 68.2 100yr + WQCV
4979.00 2.50 13,083 0.0000 0.0000 0.0000 0.0000 49.309 0.1797 4979.00 4976.67 4979.00 0.00 0.180 70.1
4979.50 3.00 20,101 0.0000 0.0000 0.0000 0.0000 82.730 0.1977 4979.50 4976.68 4979.50 0.00 0.198 80.5
4980.00 3.50 27,120 0.0000 0.0000 0.0000 0.0000 121.900 0.2143 4980.00 4976.68 4980.00 12.00 12.214 80.8
4980.03 3.53 27,541 0.0000 0.0000 0.0000 0.0000 124.414 0.2153 4980.03 4976.68 4980.03 14.00 14.215 80.8
Voice of Truth Tabernacle Subdivision
Detention Pond Outlet Summary Table
Riser
Stage - Storage - Discharge Table
Storage Parameters
WQCV Orifices
100yr Orifice Plate
Fort Collins, CO
Culvert Barrel
4/12/2020
2:42 PM
Input:
L = 12.0 ft
Lb = 3 ft
Z = 4 H:V
H = 0.50 ft
Output:
C = 2.63
Q = 12.6 cfs
Head
(ft) 0.5 0.75 1 1.5 2 2.5 3 4 5 10 15
0.2 2.8 2.75 2.69 2.62 2.54 2.48 2.44 2.38 2.34 2.49 2.68
0.4 2.92 2.8 2.72 6.64 2.61 2.6 2.58 2.54 2.5 2.56 2.7
0.6 3.08 2.89 2.75 2.64 2.61 2.6 2.68 2.69 2.7 2.7 2.7
0.8 3.3 3.04 2.85 2.68 2.6 2.6 2.67 2.68 2.68 2.69 2.64
1 3.32 3.14 2.98 2.75 2.66 2.64 2.65 2.67 2.68 2.68 2.63
1.2 3.32 3.2 3.08 2.86 2.7 2.65 2.64 2.67 2.66 2.69 2.64
1.4 3.32 3.26 3.2 2.92 2.77 2.68 2.64 2.65 2.65 2.67 2.64
1.6 3.32 3.29 3.28 3.07 2.89 2.75 2.68 2.66 2.65 2.64 2.63
1.8 3.32 3.32 3.31 3.07 2.88 2.74 2.68 2.66 2.65 2.64 2.63
2 3.32 3.31 3.3 3.03 2.85 2.76 2.27 2.68 2.65 2.64 2.63
2.5 3.32 3.32 3.31 3.28 3.07 2.89 2.81 2.72 2.67 2.64 2.63
3 3.32 3.32 3.32 3.32 3.2 3.05 2.92 2.73 2.66 2.64 2.63
3.5 3.32 3.32 3.32 3.32 3.32 3.19 2.97 2.76 2.68 2.64 2.63
4 3.32 3.32 3.32 3.32 3.32 3.32 3.07 2.79 2.7 2.64 2.63
4.5 3.32 3.32 3.32 3.32 3.32 3.32 3.32 2.88 2.74 2.64 2.63
5 3.32 3.32 3.32 3.32 3.32 3.32 3.32 3.07 2.79 2.64 2.63
5.5 3.32 3.32 3.32 3.32 3.32 3.32 3.32 3.32 2.88 2.64 2.63
Weir Crest Breadth (ft)
Emergency Overflow Weir Sizing
Fort Collins, CO
Detention Pond
Voice of Truth Tabernacle Subdivision
4/3/2020
12:00 PM
Input:
Total Q = 12.6 cfs
L = 12.0 ft
Slope = 0.25 ft/ft
Output:
Metric Conversions:
Total Q = 0.36 m3/s
L = 3.66 m
Results:
qt = 0.10 m3/s/m
D50 = 95 mm
Vm = 0.108 m/s Eq. 4
qm = 0.021 m3/s/m
qs = 0.077 m3/s/m
D50 = 0.31 ft
D50 = 3.7 in
Required Riprap D50 = 6.00 in
Riprap Type = Type VL
n = 0.046
Flowdepth = 0.052 m
Flowdepth = 0.17 ft
Outlet Reach Length = 4.66 ft
Emergency Spillway Riprap Sizing
Detention Pond
K. M. Robinson, C. E. Rice, K. C. Kadavy - March 1998
Voice of Truth Tabernacle Subdivision
Fort Collins, CO
LID DESIGN
Sheet 1 of 2
Designer:
Company:
Date:
Project:
Location:
1. Basin Storage Volume
A) Effective Imperviousness of Tributary Area, Ia Ia = 98.0 %
(100% if all paved and roofed areas upstream of sand filter)
B) Tributary Area's Imperviousness Ratio (i = Ia/100) i = 0.980
C) Water Quality Capture Volume (WQCV) Based on 12-hour Drain Time WQCV = 0.38 watershed inches
WQCV= 0.8 * (0.91* i3 - 1.19 * i2 + 0.78 * i)
D) Contributing Watershed Area (including sand filter area) Area = 28,945 sq ft
E) Water Quality Capture Volume (WQCV) Design Volume VWQCV = 922 cu ft
VWQCV = 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 DWQCV = 0.50 ft
B) Sand Filter Side Slopes (Horizontal distance per unit vertical, Z = 4.00 ft / ft
4:1 or flatter preferred). Use "0" if sand filter has vertical walls.
C) Minimum Filter Area (Flat Surface Area) AMin = 355 sq ft
D) Actual Filter Area AActual = 395 sq ft
E) Volume Provided VT = 434 cu ft TOTAL VOLUME < DESIGN VOLUME IN 1.E
3. Filter Material
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 = 1.8 ft
Volume to the Center of the Orifice
ii) Volume to Drain in 12 Hours Vol12 = 922 cu ft
iii) Orifice Diameter, 3/8" Minimum DO = 11/16 in
Voice of Truth
Fort Collins, CO
Design Procedure Form: Sand Filter (SF)
April 3, 2020
UD-BMP (Version 3.07, March 2018)
Choose One
Choose One
18" CDOT Class B or C Filter Material
Other (Explain):
YES
NO
Tabernacle-UD-BMP_v3.07.xlsm, SF 4/3/2020, 1:00 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 Works
A) Describe the type of energy dissipation at inlet points and means of
conveying flows in excess of the WQCV through the outlet
Notes:
Design Procedure Form: Sand Filter (SF)
April 3, 2020
Voice of Truth
Fort Collins, CO
Forebay sized for 1% of the WQCV. Overflow will spread and sheet flow
directly into the detention pond over turf grass. This provides an additional
layer of LID train functionality by straining through the turf grass.
Choose One
YES NO
Tabernacle-UD-BMP_v3.07.xlsm, SF 4/3/2020, 1:00 PM
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
Natural Area, Colorado
Resources
Conservation
Service
March 9, 2020
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
35—Fort Collins loam, 0 to 3 percent slopes.............................................. 13
36—Fort Collins loam, 3 to 5 percent slopes.............................................. 14
73—Nunn clay loam, 0 to 1 percent slopes.................................................15
102—Stoneham loam, 3 to 5 percent slopes.............................................. 17
Soil Information for All Uses...............................................................................19
Soil Properties and Qualities.............................................................................. 19
Soil Qualities and Features.............................................................................19
Hydrologic Soil Group (Tabernacle)............................................................ 19
References............................................................................................................24
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
4494420 4494440 4494460 4494480 4494500 4494520 4494540
4494420 4494440 4494460 4494480 4494500 4494520 4494540
497510 497530 497550 497570 497590 497610 497630 497650 497670 497690
497510 497530 497550 497570 497590 497610 497630 497650 497670 497690
40° 36' 6'' N
105° 1' 46'' W
40° 36' 6'' N
105° 1' 37'' W
40° 36' 1'' N
105° 1' 46'' W
40° 36' 1'' N
105° 1' 37'' W
N
Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 13N WGS84
0 45 90 180 270
Feet
0 10 20 40 60
Meters
Map Scale: 1:933 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
Map Unit Legend
Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI
35 Fort Collins loam, 0 to 3 percent
slopes
0.4 15.7%
36 Fort Collins loam, 3 to 5 percent
slopes
0.8 29.8%
73 Nunn clay loam, 0 to 1 percent
slopes
1.1 39.0%
102 Stoneham loam, 3 to 5 percent
slopes
0.4 15.4%
Totals for Area of Interest 2.8 100.0%
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.
Custom Soil Resource Report
11
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,
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
35—Fort Collins loam, 0 to 3 percent slopes
Map Unit Setting
National map unit symbol: 2tlnc
Elevation: 4,020 to 6,730 feet
Mean annual precipitation: 14 to 16 inches
Mean annual air temperature: 46 to 48 degrees F
Frost-free period: 135 to 160 days
Farmland classification: Prime farmland if irrigated
Map Unit Composition
Fort collins and similar soils: 85 percent
Minor components: 15 percent
Estimates are based on observations, descriptions, and transects of the mapunit.
Description of Fort Collins
Setting
Landform: Stream terraces, interfluves
Landform position (three-dimensional): Interfluve, tread
Down-slope shape: Linear
Across-slope shape: Linear
Parent material: Pleistocene or older alluvium and/or eolian deposits
Typical profile
Ap - 0 to 4 inches: loam
Bt1 - 4 to 9 inches: clay loam
Bt2 - 9 to 16 inches: clay loam
Bk1 - 16 to 29 inches: loam
Bk2 - 29 to 80 inches: loam
Properties and qualities
Slope: 0 to 3 percent
Depth to restrictive feature: More than 80 inches
Natural drainage class: Well drained
Runoff class: Low
Capacity of the most limiting layer to transmit water (Ksat): Moderately high to
high (0.20 to 2.00 in/hr)
Depth to water table: More than 80 inches
Frequency of flooding: None
Frequency of ponding: None
Calcium carbonate, maximum in profile: 12 percent
Salinity, maximum in profile: Nonsaline to very slightly saline (0.1 to 2.0
mmhos/cm)
Available water storage in profile: High (about 9.1 inches)
Interpretive groups
Land capability classification (irrigated): 3e
Land capability classification (nonirrigated): 3e
Hydrologic Soil Group: C
Ecological site: Loamy Plains (R067BY002CO)
Hydric soil rating: No
Custom Soil Resource Report
13
Minor Components
Nunn
Percent of map unit: 10 percent
Landform: Stream terraces
Landform position (three-dimensional): Tread
Down-slope shape: Linear
Across-slope shape: Linear
Ecological site: Loamy Plains (R067BY002CO)
Hydric soil rating: No
Vona
Percent of map unit: 5 percent
Landform: Interfluves
Landform position (three-dimensional): Side slope, interfluve
Down-slope shape: Linear
Across-slope shape: Linear
Ecological site: Sandy Plains (R067BY024CO)
Hydric soil rating: No
36—Fort Collins loam, 3 to 5 percent slopes
Map Unit Setting
National map unit symbol: 2yqpg
Elevation: 4,800 to 5,900 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
Fort collins and similar soils: 80 percent
Minor components: 20 percent
Estimates are based on observations, descriptions, and transects of the mapunit.
Description of Fort Collins
Setting
Landform: Alluvial fans, terraces
Landform position (three-dimensional): Tread
Down-slope shape: Linear, convex
Across-slope shape: Linear
Parent material: Pleistocene or older alluvium and/or eolian deposits
Typical profile
Ap - 0 to 5 inches: loam
Bt1 - 5 to 8 inches: clay loam
Bt2 - 8 to 18 inches: clay loam
Bk1 - 18 to 24 inches: loam
Bk2 - 24 to 80 inches: loam
Custom Soil Resource Report
14
Properties and qualities
Slope: 3 to 5 percent
Depth to restrictive feature: More than 80 inches
Natural drainage class: Well drained
Runoff class: Low
Capacity of the most limiting layer to transmit water (Ksat): Moderately high to
high (0.20 to 2.00 in/hr)
Depth to water table: More than 80 inches
Frequency of flooding: None
Frequency of ponding: None
Calcium carbonate, maximum in profile: 12 percent
Salinity, maximum in profile: Nonsaline to very slightly saline (0.1 to 2.0
mmhos/cm)
Available water storage in profile: High (about 9.1 inches)
Interpretive groups
Land capability classification (irrigated): 4e
Land capability classification (nonirrigated): 4e
Hydrologic Soil Group: C
Ecological site: Loamy Plains (R067BY002CO)
Hydric soil rating: No
Minor Components
Table mountain
Percent of map unit: 15 percent
Landform: Alluvial fans, stream terraces
Landform position (three-dimensional): Tread
Down-slope shape: Linear
Across-slope shape: Linear
Ecological site: Overflow (R067BY036CO)
Hydric soil rating: No
Larim
Percent of map unit: 5 percent
Landform: Alluvial fans
Down-slope shape: Linear
Across-slope shape: Linear
Ecological site: Gravel Breaks (R067BY063CO)
Hydric soil rating: No
73—Nunn clay loam, 0 to 1 percent slopes
Map Unit Setting
National map unit symbol: 2tlng
Elevation: 4,100 to 5,700 feet
Mean annual precipitation: 14 to 15 inches
Mean annual air temperature: 48 to 52 degrees F
Frost-free period: 135 to 152 days
Farmland classification: Prime farmland if irrigated
Custom Soil Resource Report
15
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4959
Printed: 06/24/2020
All floodplain boundaries
are approximate.
This information is based on the Federal Emergency Management
Agency (FEMA) Flood Insurance Rate Map (FIRM) and the City of
Fort Collins Master Drainageway Plans. This letter does not imply
that the referenced property will or will not be free from flooding or
damage. A property not in the Special Flood Hazard Area or in a
City Designated Floodplain may be damaged by a flood greater
than that predicted on the map or from a local drainage problem
not shown on the map. This map does not create liability on the
part of the City, or any officer or employee thereof, for any damage
that results from reliance on this information.
City Flood Risk Map
FEMA Flood Risk Map
Moderate Risk
May include:
- Areas of FEMA 500-year floodplain (FEMA Zone X-shaded).
- Areas of FEMA or City 100-year floodplain (sheet flow) with
average depths of less than 1 foot.
- Areas protected by levees from the 100-year flood.
May include:
- Areas of FEMA 500-year floodplain (FEMA Zone X-shaded).
- Areas of FEMA or City 100-year floodplain (sheet flow) with
average depths of less than 1 foot.
- Areas protected by levees from the 100-year flood.
Low Risk
Areas outside of FEMA and City mapped 100-year and 500-year
floodplains. Local drainage problems may still exist.
City Flood Fringe - May Include:
- Areas of FEMA 100-year floodplain (FEMA Zones A, AE, AO, and AH)
- Areas of City 100-year floodplain including ponding areas and sheet
flow areas with average depths of 1-3 feet.
There is a 1% annual chance that these areas will be flooded.
FEMA Flood Fringe - May Include:
- Areas of FEMA 100-year floodplain (FEMA Zones A, AE, AO, and AH)
- Areas of City 100-year floodplain including ponding areas and sheet
flow areas with average depths of 1-3 feet.
There is a 1% annual chance that these areas will be flooded.
High Risk
City Floodway - Area of 100-year floodplain with greatest depths and
fastest velocities.
FEMA Floodway - Area of 100-year floodplain with greatest depths and
fastest velocities.
Erosion Buffer Limits
0 87.5 175 350 525 700
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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 14, Sep 13, 2019
Soil map units are labeled (as space allows) for map scales
1:50,000 or larger.
Date(s) aerial images were photographed: Sep 20, 2015—Oct
21, 2017
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
Roof
(ft
2
)
C = 0.95
90% IMP
Lawns, Sandy Soil,
Avg Slope 2-7%
Area (ft
2
)
C = 0.15
2% IMP Composite C Composite C100
Percent
Impervious (%)
Net Impervious Area
(ft2
)
Cummulative Net
Impervious Area (ft2
)
Cummulative
Net Site %IMP
S2 28,945 0.664 23,296 5,649 0 0.95 1.00 98.0% 28,380 28,380
S1 9,707 0.223 606 5,649 3,452 0.67 0.83 59.3% 5,759 5,759 16%
S2 27,015 0.620 23,296 5,649 0 1.02 1.00 105.1% 28,380 34,139 95%
S3 1,945 0.045 1,433 512 0 0.95 1.00 97.4% 1,894 36,033 100%
38,667 0.888 0.93 1.00 93.2% 36,033
Proposed and Existing Infrastructure
Proposed Infrastructure Only for Detention and LID Purposes
LID
Detention
Runoff Coefficents and Site Percent Imperviousness Calculations
Proposed Conditions
Voice of Truth Tabernacle Subdivision
Fort Collins, CO
11:39 AM
4/3/2020