PERMFILE71223

• Permit No: C1981071
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Section_Exhibit Name: EXHIBIT 13 SEDIMENTATION PONDS HYDROLOGIC INVESTIGATIONS
• Media Type: D
• Archive: No

Table 2 CURVE NUPffiERS
Curve numbers (CN) an3 constants for the case Ia = 0.2 S
1 2 3 4 5 1 3 4 5
CN for
CN
for
S Curve* CN for
CN
for
S Curve*
condi-
conditions
values* starts condi-
i
cond
itions values* starts
where
tion I III Where L
on I III
II P = II P =
inches inches inches inches)
loo loo loo 0 0 60 40 78 6.67 1.33
99 97 loo .101 .oz 59 3~ 77 6•~ i•39
98 94 99 .204 .04 58 3~ 76 7.24 1.45
97 91 99 •309 .06 57 37 75 7.54 1.51
96 89 99 •417 .08 56 36 75 7.86 1.57
95 87 98 •526 .11 55 35 74 8.18 1.64
94 85 98 .638 .13 54 34 73 8.52 1.70
93 83 98 •753 •15 53 33 72 8.87 1.77
92 81 97 .870 .17 52 32 71 9.23 1.85
91 80 97 •989 .20 51 31 70 9.61 1.92
90 78 96 1.11 .22 50 31 70 10.0 2.00
89 76 96 1.24 .25 49 30 69 10.4 2.08
Fr 75 95 1.36 .27 48 2~ c3 10.8 2.16
87 73 95 1.49 •;~ 47 28 67 11.3 2.26
86 7`~ 94 1.63 •33 46 27 66 11.7 2.34
85 70 94 1.76 •35 45 26 65 12.2 2.44
84 68 93 1.90 .38 44 25 64 12.7 2.54
83 67 93 2.05 .41 43 25 63 13.2 2.64
• 82
81 66
64 9z
92 2.20
2.34 .44
.47 42
41 24
23 62
61 13.8
14.4 2.76
2.88
80 63 91 2.50 .50 40 22 60 15.0 3.00
79 62 91 2.66 •53 39 21 59 15.6 3.12
78 60 90 2.82 .56 38 ~ 58 16.3 3.26
77 59 89 2.99 •~ 37 ~ 57 17.0 3•~
76 58 89 3.16 .63 36 19 56 17.B 3.56
75 57 ~ 3.33 •67 35 18 55 18.6 3.72
74 55 88 3.51 .70 34 18 54 19.4 3.88
73 54 87 3.70 .74 33 17 53 20.3 4.06
72 53 8ti 3.89 .78 32 16 52 21.2 4.24
71 52 86 4.08 .82 31 16 51 22.2 4.44
70 51 85 4.28 .86 30 15 50 23.3 4.6'
69 50 84 4.49 .90
68 48 84 4.70 .94 25 12 43 30.0 6.00
67 47 83 4.92 .98 20 9 37 40.0 8.00
66 46 82 5.15 1.03 15 6 30 56.7 11.34
65 45 82 5.38 i.o8 l0 4 22 90.0 18.00
64 44 81 5.62 1.12 5 2 13 190.0 38.00
63 43 80 5.87 1.17 0 0 0 infinity infinity
62 42 79 6.13 1.23
61 41 78 6.39 1.28
+For CN in column 1.
. Reproduced from Chapte r 10 of National Engineering Handbook,
Section 4, Hydrology, SCS.