Problem 2 [30 points] The runoff hydrograph for a site before any development is given below Time (min) 0 30 60 90 120 150 180 210 240 270 300 330 Q (m3 /s) 0 2 7.5 1.7 0.9 0.75 0.62 0.49 0.3 0.18 0.05 0 (a) What is the runoff volume before development? (b) A contractor is considering developing the site by adding a residential complex with amenities. The water resources engineer has provided him with the following post-development hydrograph for the proposed construction. What is the total runoff volume after development?