2013-10-30_PERMIT FILE - C1981038A ‎(2)‎

• Permit No: C1981038A
• IBM Index Class Name: Permit File
• Doc Date: 10/30/2013
• Section_Exhibit Name: Volume 8 Surface Drainage - Drainage - Design & Location
• Media Type: D
• Archive: Yes

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FIGURE S-4 RUNOFF CURVE NUMBERS FOR HYDROLOGIC SOIL-COVER COMPLEXES

(Antecedent moisture condition II, and
Ia -
0.2 S) L~
~(~/
Cover
Land use Treatment Hydrologic
or practice condition Hy drolog ic soil group
A B C D

Fallow Straight row ---- 77 86 91 94
Row crops 3/ " Poor 72 81 88 91
Good 67 78 85 89
Contoured Pocr 70 79 84 88
" Good 65 75 82 86
"and terraced Poor 66 74 80 82
" " Good 62 71 78 81
Small 3/ Straight row Poor 65 76 84 88
grain Good 63 75 83 87
Contoured Poor 63 74 82 85
Good 61 73 81 84
"and terraced Poor 61 72 79 82
Good 59 70 78 81
Close-seeded Straight row Poor 66 77 85 89
legumes 1/ Good 58 72 81 85
or Contoured- Poor 64 75 83 85
rotation " Good 55 69 78 83
meadow "and terraced Poor 63 73 80 83
"and terraced Good 51 67 76 80

Pasture Poor 68 79 ~ $(L 89
or range Fair 49 69 79 84
Good 39 61 74 80
Contoured Poor 47 67 81 88
" Fair 25 59 75 83
" Good 6 35 ]~( _ 79

Meadow Good 30 58 71 78
Woods (Isolated groves on Poor "45 66 77' 83
farms & ranches) Fair 36 60 73 79
Good 25 55 70 77
Farmsteads ---- 59 74 82 86
Roads (dirt) 2/ ____ 72 82 87 89
(hard surface) 2/ ---- 74 84 90 92
1/ Close-drilled or broadcast
2/ Including right-of-way
3/ Do not use adjustments for contoured or terraced treatments with
storm frequencies greater than 10 years.
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