2011-01-04_PERMIT FILE - C1981012A ‎(2)‎

• Permit No: C1981012A
• IBM Index Class Name: Permit File
• Doc Date: 1/4/2011
• Doc Name: DEVELOPMENT WASTE DISPOSAL AREA
• Section_Exhibit Name: Exhibit 39 Development Waste Disposal Area Stormwater Calculation Summary
• Media Type: D
• Archive: Yes

• Soil /Surface Description -- --- ------------- - - -- -- acres) -------- - --- -- ----- - - - - CN
----------- - - -- -- - - - --
Paved roads with open ditches, 50% imp 0.16 D 93.00
Dirt roads 0.08 D 89.00
Pinyon & Juniper range, Fair 7.72 D 80.00
Composite Area & Weighted CN 7.95 80.35
EPA SWMM Time of Concentration Computations Report
Tc = (0.94 * (L ^0.6) * (n ^0.6)) / ((i ^0.4) * (S ^0.3))
Where:
x ** * * * * * * ** * * * * * * * *'. * **
Subbasin Runoff Summary
• --------------------------------------------------------------------------------------------------------
Autodesk Storm and Sanitary Analysis Page 4 of 6
TR -53 Page E 39 -7 Revised 1/3/11
Tc = Time of Concentration (min)
L = Flow Length (ft)
n = Manning's Roughness
i = Rainfall Intensity (in /hr)
S = Slope (ft /ft)
----- --- -- - ---
Subbasin DWDA
-- ------ - - - - --
Flow length (ft):
936.69
Pervious Manning's Roughness:
0.10000
Impervious Manning's Roughness:
0.10000
Pervious Rainfall Intensity (in /hr):
0.17500
Impervious Rainfall Intensity (in /hr):
0.17500
Slope ( %):
3.50000
Computed TOC (minutes):
78.67
- ------- - - - - --
Subbasin DWDA Diversion 1
Flow length (ft):
139.13
Pervious Manning's Roughness:
0.35000
Impervious Manning's Roughness:
0.01500
Pervious Rainfall Intensity (in /hr):
0.17500
Impervious Rainfall Intensity (in /hr):
0.17500
Slope ( %):
10.00000
Computed TOC (minutes):
37.60
-------- - - - - --
Subbasin DWDA Diversion 2
--- --- --- -- ---
Flow length (ft):
2046.71
Pervious Manning's Roughness:
0.35000
Impervious Manning's Roughness:
0.01500
Pervious Rainfall Intensity (in /hr):
0.17500
Impervious Rainfall Intensity (in /hr):
0.17500
Slope ( %):
30.00000
Computed TOC (minutes):
139.12
-------- - - - - --
Subbasin DWDA Diversion 3
-------- - - - - --
Flow length (ft):
634.77
Pervious Manning's Roughness:
0.35000
Impervious Manning's Roughness:
0.01500
Pervious Rainfall Intensity (in /hr):
0.17500
Impervious Rainfall Intensity (in /hr):
0.17500
Slope ( %):
30.00000
Computed TOC (minutes):
68.50
x ** * * * * * * ** * * * * * * * *'. * **
Subbasin Runoff Summary
• --------------------------------------------------------------------------------------------------------
Autodesk Storm and Sanitary Analysis Page 4 of 6
TR -53 Page E 39 -7 Revised 1/3/11