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( <br />:~ <br />1 <br />1 <br />~, <br />f' <br />( , <br />I ' <br /> <br />1 <br />1 <br /> <br />_' <br />I <br />1 <br />1 <br /> <br />- 63 - <br />Table H.9 Runoff Gave Numbers (CN1 for Hydrologic So11 _ Cover CooQlexeei <br /> <br />Lard use or cover Treat 4 <br />w <br />t o Hydrologic <br />oanditS <br />fo Hydrologic Boil group <br /> en <br />r <br />practice r <br />On <br />Srtfiltratirg <br />A <br />B <br />C <br />D <br />I. Agrlwltural lYse (from 1SBR~ 1977) <br />Follow___--_____-_-_°_'-______- SR ---_'__-'-._._ 77 Bb 91 94 <br />Row rraps_______________________°- -. SR Poor._____-__-__ 72 81 88 91 <br /> SR_ Good____~_____ bl 78 85 84 <br /> C Poor___________ 70 79 84 B8 <br /> C Good_______._.__ 65 75 62 Bb <br /> C8T Poor__________. 66 74 80 B2 <br /> C6T Good __.__.._____ 62 71 78 81 <br />Small grain___________ ________________ SR Poor _. _______._ 65 76 B4 88 <br /> SR Good_____________ 63 75 83 87 <br /> C Poor_____.___.._. 63 74 82 BS <br /> t Good_______._._ 61 73 81 84 <br /> CdT Paor________.__ 61 72 79 82 <br /> C8T Good___________. 59 70 76 81 <br />Closeaeed~d SR Poor____________ 66 77 85 B9 <br />legumes or SR Good___.._______ 58 72 81 85 <br />rotation meadow. C Poar____._______ 64 75 83 85 <br /> C Good_____________ 55 69 78 83 <br /> C6T Poor_____________ 63 73 80 83 <br /> CdT Gaod_____________ 51 67 76 60 <br />Pasture or range __________ _______°_ ____'__--_- Poor_______. ___-_ 68 79 B6 89 <br /> Foir_____________ 49 69 79 84 <br /> Good ____.___.__.. 39 61 74 BO <br />" C Poor___. __._-.._ 47 67 81 88 <br /> C Fair____.._. ____ 25 59 75 83 <br /> C Good __.____.___. 6 35 70 79 <br />Meadow (permonentJ __________ do____________ 30 SB 71 76 <br />Woods (farm woodlots) ____________ Poor____._..__._ 45 bb 77 83 <br /> Fair__________..- 36 60 73 79 <br /> Good_____________ 25 55 70 77 <br />Farmsteads --_'___________ __________'- _°__.-_____ _--__.___°_°-__ 59 74 B2 B6 <br />Roads Idirt)3(hard surfoce)3 ___._________ __..__---------------- 72 B2 87 B9 <br /> 74 84 90 92 <br />II. Surface Mine Use (OSM~ 19811 <br />Surface facilities <br />Paved _________ __________________________ _____________ _____________________ 96 98 9B 98 <br />Grovel.....__.._____________________ ___________ _________________ _______ __________ _____ 76 85 89 91 <br /> <br />Disturbed area (active ml Wing )____ _____________ _________..________ 72 81 88 91 <br />Reclcimed spo11__________________ __________ __________ ____. ___ 39- 61- 74- 80. <br />(with vegetated cover) 72 B1 88 91 <br />Notes: <br />1, These CN values are for antecedent moisture condition II (AAK-I11, To find the proper CN <br />far AMC-III or AMC-I~ use the CN from this table in Table, <br />2. C1 ose~rilled or brand cast, <br />3, Including right-of-way. <br />1 <br />~1 <br />43 <br />