A single-family home includes a 130 m2 dwelling, 80 m2 driveway and paved patio, 275 m2 lawn, and 150 m2 landscape. Initial abstraction and hydraulic conductivity of lawn and landscape are as follows:

a. L = 10 mm, K = 50 mm/h—lawn

b. L = 30 mm, K = 75 mm/h—landscape Calculate the lag time, the runoff volume, and peak runoff for a storm of 60 mm/h, lasting 1 hour for the following cases:

a. Roof and driveway drain directly to street

b. Roof downspouts end at the landscape

c. Roof and driveway drain to lawn and landscape