2008-01-24_PERMIT FILE - C1981020A

• Permit No: C1981020A
• IBM Index Class Name: Permit File
• Doc Date: 1/24/2008
• Section_Exhibit Name: Tables 2.1-1 to 4.1-5
• Media Type: D
• Archive: Yes

TABLE 3.9 - 5 Culvert Removal and Stream Channel Reconstruction
MUNGER CREEK 72 INCH CULVERT
Design the channel to pass the flow from a 100YR 24HR event
The calculations of flow for Q100 are from Appendix M(v)
Given: Event - 100 year 24 hour Q100 = 431 cfs
Slope of channel = 0.504'0
Soil type = Alluvial Silt Noncolloidal
Maximum Velocity (fps) = 5
Trapezoidal Ditch Dimensions:
Depth = d = (feet) 3.5
Base = b = (feet) 8
Side Slopes = z = 5.00
Manning No. = n = 0.035
Area of flow = A =
bd +zd2 =
89.25
Hyd. Radius = R =

bd +zd2 / b + 2d(z2 + 1)0.5
R = 2.0427
Velocity of flow = V = 1.49/n * R0.667 * S0.5
Quantity of Flow = Q = A * V
V = 4.8462
Q = 432.523
ROAD
z=5h:1V
OVERALL CHANNEL DEPTH WILL BE 8 FEET TO CREATE FORD
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