PERMFILE138126

• Permit No: C1991078A
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Section_Exhibit Name: Exhibit 09 Protection of the Hydrologic Balance
• Media Type: D
• Archive: Yes

• ACCESS & HAUL ROAD CULVERTS AND BORROW DITCHES
PEAK FLOW CALCU LATIONS
CMP #1 CMP #2 CMP #3 CMP #4
DRAINAGE AREA (ACRES) 1.59 46.40 5.37 41.40
CURVE NO. 80.0 80.0 80.0 80.0
STORM EVENT _YR., 24 HR. 10 10 10 10
STORM EVENT in. 1.6 1.6 1.6 1.6
RUNOFF in. 0.34 0.34 0.34 0.34
WATERSHED RELIEF ft. 10 90 60 90
WATERSHED SLOPE % 0.07 0.03 0.03 0.03
SLOPE ADJUSTMENT FACTOR 1.09 0.91 0.93 0.91
LENGHT OF WATERSHED 150 2600 2400 3600
EQUIVALENT DRAINAGE AREA 0.6 67 58 115
PEAK FLOW cfs/in, Fig D-2 1.9 50 45 70
ADJUSTED PEAK FLOW 1.9 10.6 1.29 7.7
MINIMUM CULVERT SIZE INCHES 12 24 12 24
CMP #5 CMP #6 CMP #7 CMP #8
DRAINAGE AREA (ACRES) 6.61 37.51 0.40 10.06
CURVE NO. 80.0 80.0 80.0 80.0
STORM EVENT YR., 24 HR. 10 10 10 10
• STORM EVENT in. 1.6 1.6 1.6 1.6
RUNOFF in. 0.34 0.34 0.34 0.34
WATERSHED RELIEF ft. 50 80 10 70
WATERSHED SLOPE % 0.06 0.02 0.05 0.06
SLOPE ADJUSTMENT FACTOR 1.07 1.25 1.04 1.07
LENGHT OF WATERSHED 900 3400 200 1100
EQUIVALENT DRAINAGE AREA 11.4 104 0.9 16
PEAK FLOW cfs/in, Fig D-2 13.0 41 1.9 17
ADJUSTED PEAK FLOW
MINIMUM CULVERT SIZE INCHES
DRAINAGE AREA (ACRES)
CURVE NO.
STORM EVENT _YR., 24 HR.
STORM EVENT in.
RUNOFF in.
WATERSHED RELIEF ft.
WATERSHED SLOPH %
SLOPE ADJUSTMENT FACTOR
LENGHT OF WATERSHED
EQUIVALENT DRAINAGE AREA
PEAK FLOW cfs/in, Fig D-2
• ADJUSTED PEAK FLOW
MINIMUM CULVERT SIZE INCHES
2.7 6.2 0.29 3.9
18 24 12 18
CMP #9 CMP #10 CMP #11 CMP #12
0.31 2.42 1.17 1.25
80.0 80.0 80.0 80.0
10 10 10 10
1.6 1.6 1.6 1.6
0.34 0.34 0.34 0.34
15 30 30 10
0.05 0.03 0.06 0.03
1.04 0.93 1.07 0.93
300 1000 500 300
1.8 14 4.3 1.8
3.3 16 6.0 3.3
0.2 0.9 0.59 0.7
12 12 12 12
9-25 July 1991