Determine the runoff coefficient for an area of 0.1 km2. 7000 m2 by Gravel driveways and walks, and 12000 m2 by Asphaltic cement streets, 22000 m2 is covered by buildings. The remaining area is slope >7%, heavy soil, covered by grass lawn 0.8705 ~0.5445 O 0.7705 ~0.6445 O 0.6705 ~0.4445 O

Compute the runoff from a 5-in. rainfall from a watershed which has four soil groups overall and the land cover is fair grass cover. Also, estimate the effect of urbanization if the land cover changed into four urban categories as shown below: Land Use Land use Soil Group Before Urbanization After urbanization Grass Residential 40% C Grass Grass 25% D Grass Commercial 20% Grass Industrial 15% D CN CN Before Urbanization After Urbanization 79 83 83 80 79 94 33 83 93

22.