HomeMy WebLinkAboutVOICE OF TRUTH TABERNACLE - PDP200011 - SUBMITTAL DOCUMENTS - ROUND 2 - DRAINAGE REPORTHYDROLOGY SUMMARY TABLES
Design Point Basins Area (ac) %Imp C2 C100 Q2 (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 = 0.95100% IMPRoof (ft2)C = 0.9590% IMPLawns, Sandy Soil, Avg Slope 2-7%Area (ft2)C = 0.152% IMP Composite CComposite C100Percent Impervious (%)Net Impervious Area (ft2)Cummulative Net Impervious Area (ft2)Cummulative Net Site %IMPE1 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% 8,641OffsiteO1 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% 2,423Runoff Coefficents and Site Percent Imperviousness CalculationsVoice of Truth Tabernacle SubdivisionFort Collins, COExisting Conditions11:33 AM4/3/2020
NotesDesign Basins Area C*Cf (2yr)Cf (100yr)C2C100LSti (2yr)ti(100yr)LSVtLL tLL tLComputed Tc Max Tc Final Tc Computed Tc Max Tc Final Tc i2i100Q2 Q100Minor MajorPoint (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 11.511.518.8 11.511.52.09 7.291.43 6.262 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 0.00.0 23.2 11.511.522.3 11.511.52.09 7.300.10 0.443 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 0.00.0 12.6 10.710.711.5 10.710.72.15 7.510.14 0.61* Weighted-area average method used to calculate composite C for design points that have multiple tributary basins.Rational MethodExisting ConditionsVoice of Truth Tabernacle SubdivisionFort Collins, COSub-Basin Data Initial Overland Time Gutter Flow Tc 2yr Tc 100yr Intensity RunoffStreet CapacityChannel Flow Pipe Flow11:42 AM4/3/2020
Design Point Basins Area (ac) %Imp C2 C100 Q2 (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 (ft2)Total Area (ac.)Paved Area(ft2)C = 0.95100% IMPRoof (ft2)C = 0.9590% IMPLawns, Sandy Soil, Avg Slope 2-7%Area (ft2)C = 0.152% IMP Composite CComposite C100Percent Impervious (%)Net Impervious Area (ft2)Cummulative Net Impervious Area (ft2)Cummulative Net Site %IMPS1 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% 44,735Basin No.Total Impervious Area (ft2)Total Area (ac.)Paved Area(ft2)C = 0.95100% IMPRoof (ft2)C = 0.9590% IMPLawns, Sandy Soil, Avg Slope 2-7%Area (ft2)C = 0.152% IMP Composite CComposite C100Percent Impervious (%)Net Impervious Area (ft2)Cummulative Net Impervious Area (ft2)Cummulative Net Site %IMPS2 28,945 0.664 23,296 5,649 0 0.95 1.00 98.0% 28,380 28,380S1 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% 36,033Proposed and Existing InfrastructureProposed Infrastructure Only for Detention and LID PurposesLIDDetentionRunoff Coefficents and Site Percent Imperviousness CalculationsProposed ConditionsVoice of Truth Tabernacle SubdivisionFort Collins, CO11:39 AM4/3/2020
NotesDesign Basins Area C*Cf (2yr)Cf (100yr)C2C100LSti (2yr)ti(100yr)LSVtLL tLL tLComputed Tc Max Tc Final Tc Computed Tc Max Tc Final Tc i2i100Q2 Q100Minor MajorPoint (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 5.001.9 1.5 0 0.000 0.0 0.0 539.0 4.1 0.0 0.0 6.0 13.06.05.6 13.05.62.67 9.580.44 1.952 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 0.0 104.00.8 0.0 0.0 8.0 11.48.06.0 11.46.02.40 9.301.81 8.783 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 12.512.518.4 12.512.52.01 7.042.74 11.984 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 11.65.85.3 11.65.32.71 9.750.31 1.39* Weighted-area average method used to calculate composite C for design points that have multiple tributary basins.DesignLt SRt SWSlope "n" Y L V tL Dia "n" S L VPoint (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 0.02 50.0 50.0 2.0 0.016 0.016 0.13104 2.09 0.8 n/a n/a n/a 0.0 0.03 50.0 50.0 1.0 0.005 0.060 0.28206 0.48 7.1 n/a n/a n/a 0.0 0.03 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 0.0Tc 100yr Intensity RunoffStreet CapacityTravel Time ParametersChannel PipeRational MethodProposed ConditionsVoice of Truth Tabernacle SubdivisionFort Collins, COSub-Basin Data Initial Overland Time Gutter FlowChannel Flow Pipe FlowTc 2yr11:55 AM4/3/2020
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 (ft
2) 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 0WQCV Elev =4977.33 0.83100-Yr WSEL =4978.87 2.37Co =0.61H(WQCV)0.83H/3 =0.28H(100YR) =2.37Invert Elev Diameter (in) Diameter (ft) Centroid Elev Top of Orifice Elev Orifice Area (in2)Orifice 14976.500.70 0.0583 4976.53 4976.560.385Orifice 2N/A0.00 N/AN/AN/AN/AOrifice 3N/A0.00 N/AN/AN/AN/AInvert Elev = 4976.50Diameter (ft) = 1.25Diameter (in) = 2.10 0.175 ft Up Invert Elev (ft) = 4976.50Co = 0.61 Slope (ft/ft) = 0.005Length (ft) = 273.53Dn Invert Elev (ft) = 4975.13Manning's n = 0.013Tailwater Elev (ft) = 4975.94Lower Crest Elev Upper Crest Elev Theta Inside Width (ft) Inside Length (ft) Open Area Ratio (n) CD4977.35 4978.35 0.24 4 4 0.73 0.62Elevation (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 PlateCapacity (cfs)100yr Orifice PlateHGL (ft)HGL Culvert Barrel (ft)Structure HGL (ft)Emergency Overflow Weir (cfs)Total Outflow (cfs)Drain Time (hrs) Notes4976.500.0000.00000.00000.00000.00000.000 0.00004976.504976.504976.500.00 0.000 0.04977.00 0.501590.0088 0.0000 0.0000 0.0088 0.000 0.0756 4976.55 4976.54 4976.55 0.00 0.009 10.04977.33 0.831,3680.0115 0.0000 0.0000 0.0115 0.000 0.1013 4976.56 4976.55 4976.56 0.00 0.011 43.1 WQCV4977.35 0.851,4450.0116 0.0000 0.0000 0.0116 0.000 0.1028 4976.56 4976.55 4976.56 0.00 0.012 44.94978.00 1.503,8340.0000 0.0000 0.0000 0.0000 7.711 0.1368 4978.00 4976.65 4978.00 0.00 0.137 53.94978.87 2.3711,8530.0000 0.0000 0.0000 0.0000 41.544 0.1746 4978.87 4976.67 4978.87 0.00 0.175 68.2 100yr + WQCV4979.00 2.5013,0830.0000 0.0000 0.0000 0.0000 49.309 0.1797 4979.00 4976.67 4979.00 0.00 0.180 70.14979.50 3.0020,1010.0000 0.0000 0.0000 0.0000 82.730 0.1977 4979.50 4976.68 4979.50 0.00 0.198 80.54980.00 3.5027,1200.0000 0.0000 0.0000 0.0000 121.900 0.2143 4980.00 4976.68 4980.00 12.0012.214 80.84980.03 3.5327,5410.0000 0.0000 0.0000 0.0000 124.414 0.2153 4980.03 4976.68 4980.03 14.0014.215 80.8Voice of Truth Tabernacle SubdivisionDetention Pond Outlet Summary TableRiserStage - Storage - Discharge TableStorage ParametersWQCV Orifices100yr Orifice PlateFort Collins, COCulvert Barrel4/12/20202:42 PM
Input:L = 12.0 ftLb = 3 ftZ = 4 H:VH = 0.50 ftOutput:C = 2.63Q = 12.6 cfsHead(ft) 0.5 0.75 1 1.5 2 2.5 3 4 5 10 150.2 2.8 2.75 2.69 2.62 2.54 2.48 2.44 2.38 2.34 2.49 2.680.4 2.92 2.8 2.72 6.64 2.61 2.6 2.58 2.54 2.5 2.56 2.70.6 3.08 2.89 2.75 2.64 2.61 2.6 2.68 2.69 2.7 2.7 2.70.8 3.3 3.04 2.85 2.68 2.6 2.6 2.67 2.68 2.68 2.69 2.641 3.32 3.14 2.98 2.75 2.66 2.64 2.65 2.67 2.68 2.68 2.631.2 3.32 3.2 3.08 2.86 2.7 2.65 2.64 2.67 2.66 2.69 2.641.4 3.32 3.26 3.2 2.92 2.77 2.68 2.64 2.65 2.65 2.67 2.641.6 3.32 3.29 3.28 3.07 2.89 2.75 2.68 2.66 2.65 2.64 2.631.8 3.32 3.32 3.31 3.07 2.88 2.74 2.68 2.66 2.65 2.64 2.632 3.32 3.31 3.3 3.03 2.85 2.76 2.27 2.68 2.65 2.64 2.632.5 3.32 3.32 3.31 3.28 3.07 2.89 2.81 2.72 2.67 2.64 2.633 3.32 3.32 3.32 3.32 3.2 3.05 2.92 2.73 2.66 2.64 2.633.5 3.32 3.32 3.32 3.32 3.32 3.19 2.97 2.76 2.68 2.64 2.634 3.32 3.32 3.32 3.32 3.32 3.32 3.07 2.79 2.7 2.64 2.634.5 3.32 3.32 3.32 3.32 3.32 3.32 3.32 2.88 2.74 2.64 2.635 3.32 3.32 3.32 3.32 3.32 3.32 3.32 3.07 2.79 2.64 2.635.5 3.32 3.32 3.32 3.32 3.32 3.32 3.32 3.32 2.88 2.64 2.63Weir Crest Breadth (ft)Emergency Overflow Weir SizingFort Collins, CODetention PondVoice of Truth Tabernacle Subdivision4/3/202012:00 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
Area, ColoradoNatural
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
44944204494440449446044944804494500449452044945404494420449444044944604494480449450044945204494540497510 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'' W40° 36' 6'' N105° 1' 37'' W40° 36' 1'' N
105° 1' 46'' W40° 36' 1'' N
105° 1' 37'' WN
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
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
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
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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
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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
0 175 350 525 70087.5
Feet