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2 <br />Table 2 -2•--R off cui^ve numbers for selected agricultural, suburban, and <br />illban land use. (1):ntecedent igoisture.'condition II', and Ia = 0.2S) <br />Cultivated land-/: without conservation treatment <br />with conservation treatment <br />HYDROLOGIC SOIL GR[1 J? <br />® ®/ <br />pasture or range land ;: poor condition .rk/ <br />gpod condiIion ®� <br />.. :. ®® 7r <br />Wood or Forest .land: thin stand, poor cover, no mulch <br />7O <br />good cover =/ ' <br />parks, golf courses, eemeteriea, etc. 80'. <br />greys cover on-75x �or'more of the area Sk <br />grase'.�cover. on 50%� to :75%. of: the area. ®m� <br />ees areas 89 <br />a(g2z Smpervious)•-.�...... lam®l <br />Average. '%..Impervidus " " -1 <br />85 90 <br />65 T5 8, 3 •. <br />age <br />urDS and storm severs --�.' <br />1111 <br />.Open Spaces, la' . <br />.'.'good condition: <br />fair condition: <br />ae (85% impervious) <br />Commercial and buein <br />Industrial district <br />: Residential :2 / <br />Average lot size_ <br />1/8 acre or less <br />i/k acre <br />1 / ?.acre . <br />l/2 acre <br />l acre. <br />Streete and reads:. <br />paved vith r <br />gravel <br />.: dirt .. <br />!/ For a more detailed. description of :agriou?tural land use::nurYe numbers <br />refer <br />. 9ational Engineering Handbook; Section k,•$ydrologY,. Chapter:?. Aug.: <br />1972.: <br />cover is. protected from grazing :andlitter ard.bruah, cover soil.: <br />°/ Curve numbers are oomputed sssuming: the runoff.from thv water/directed drite a%... " <br />.. is :directed .towards the' street with' nccurimuei of roof ...e..:. <br />where a3ait1onal inriltration coup Q: coneidered,to be in good pasture condition <br />' Tne remaining.pervious areas (iean).ar <br />for a these. curve,numbers:.f._ r ;u curve numDer.of.95.mey be need. .. <br />2/ Iii sose warmer' ellinptee:'of.the enuntr7l s <br />.r <br />0012 <br />