Assume the watershed in Example 2-5 has gone through extensive commercial and industrial growth on the wooded area. Now 50% of the formerly wooded areas have become urbanized, so of that portion, 40% is commercial and business and 60% is fair condition lawn space. Assume the soil is 50% group B and 50% group C for all areas. Using Figure 2-8, determine the runoff volume for a rainfall of 6 in.