Question

6. A 71-acre urban watershed includes 60 acres of open area with 80% grass cover (in good condition) and i l acres of an industrial development that is 72% impervious. The existing soil belongs to the hydrologic soil group B (50%) and soil group C (50%). Find the composite curve number. orm ha ven

Answer 1

Son giuen total Curban warned) area (A) 키-acre . al 60 acres cpen area ωǐth 80% Iran cover (1n good condiha) group B ג(N=61 uh tried a几巳a a CN average (N 60+,1 CA) 64 . 머.. 64.1 6o+ 6.6 amposti curve r!umber 64-1 treo -70.36 오