_PERMIT FILE - C1981008A ‎(13)‎

• Permit No: C1981008A
• IBM Index Class Name: PERMIT FILE
• Doc Name: Sedimentation Pond 004
• Section_Exhibit Name: Tab 13 Attachment D
• Media Type: D
• Archive: Yes

Q = C Ao—�r2g
where:
Q = discharge in cfs
C = coefficient of discharge = 0.6
Ao = cross sectional Area = 0.0021 ft.2 (5/8 inch diameter)
g = gravitational constant = 32.2 ft/sec.2
H = head (ft. ) = 0 to 6.0 ft.
Elevation Q cfs
5662.0 0.0
5664.0 0.014
5666.0 0.020
5668.0 0.025
Table 7 is a summary of the spillway data.
TABLE 7
Spillway Data Summary
Sediment Pond 004
Principal Spillway: Type . . . . . . . Riser Inlet (CMP)
Orifice Diameter . . . 5/8 inch
Inlet Elevation. . 5662.0
10-year, 24-hour Peak
Stage. . . . . . . . . 5665.07
Emergency Spillway: Type . . . Drop Inlet (CMP)
Barrel Diameter 12.000-inch
Riser Diameter . . . . 12.000-inch
Length of Barrel . . . 70.000-ft
Vertical Head Drop 1.4-ft.
Entrance Loss Coef. 1.000
Bend Loss Coef. . 0.500
Wier Coef. . . . . . . 3.100
Orifice Coef. . . . . 0.600
Manning Coef. . . . . 0.025
Inlet Elevation. . 5666.0
25-year, 24-hour Peak
Stage. . . . . . . . . 5665.89
The entrance to the emergency spillway is located more than one foot
above the principal spillway. There will be no flow through the
emergency spillway inlet as a result of the runoff from a 10-year,
24-hour precipitation event or less.
10