2012-05-11_PERMIT FILE - C1981033 ‎(4)‎

• Permit No: C1981033
• IBM Index Class Name: Permit File
• Doc Date: 5/11/2012
• Section_Exhibit Name: EXHIBIT 11 DRAINAGE AND SEDIMENT CONTROL PLAN
• Media Type: D
• Archive: No

PEAK FLOW CALCULATIONS
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AREA
#1 #2 #3 #4
DRAINAGE AREA (ACRES) 1.0 1.3 0.2 1.6
CURVE NO. 82 82 82 82
STORM EVENT YR., 24 HR. 10 10 10 10
STORM EVENT in. 2.0 2.0 2.0 2.0
RUNOFF 0.65 0.65 0.65 0.65
WATERSHED RELIEF 190 130 30 90
Lc 25 I38 230 59 551
LC 50 277 267 69 687
Lc 75 251 254 84 244
WATERSHED SLOPE 0.71 0.43 0.18 0.48
SLOPE ADJUSTMENT FACTOR 1.17 1.17 1.02 1.17
LENGHT OF WATERSHED 350 480 110 400
EQUIVALENT DRAINAGE AREA 2.4 4.0 0.3 3.0
PEAK FLOW cfs/in Fig D-2 5.9 8.5 2.9 6.7
ADJUSTED PEAK FLOW 1.93 2.10 1.12 2.76
PEAK FLOW CALCULATIONS
AREA
#5 #6 #7 EMERGENCY
SPILLWAY
DRAINAGE AREA (ACRES) 0.6 5.7 3.4 13.8
CURVE NO. 82 82 82 82
STORM EVENT YR., 24 HR. 10 10 10 25
STORM EVENT in. 2.0 2.0 2.0 2.4
RUNOFF 0.65 0.65 0.65 0.93
WATERSHED RELIEF 70 320 50 330
Lc 25 114 204 205 690
LC 50 246 163 447 640
LC 75 241 278 1778 400
WATERSHED SLOPE 0.40 0.21 0.21 0.24
SLOPE ADJUSTMENT FACTOR 1.12 1.03 1.03 1.06
LENGHT OF WATERSHED 210 740 744 1750
EQUIVALENT DRAINAGE AREA 1.0 8.2 8.3 34.5
PEAK FLOW cfs/in Fig D-2 2.9 15.0 16.0 45.0
ADJUSTED PEAK FLOW 1.25 6.95 4.38 17.64
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11-3 Rev. 02-15-94