A storm drain system is shown in Figure P16.11. For the flow conditions indicated, determine the time of concentration from Point A to Point C using the Kirpich, Kerby, Bransby-Williams, and Federal Aviation Administration Methods.

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You are responsible for calculating the peak discharge for a culvert design in a smallwatershed in Washington, DC. The watershed area is 4 acres and currently has 30 % of its area ofindustrial (heavy areas) and 70 % of residential (single –family areas). The design manual suggestsyou design your culvert for a 10 return period. The watershed has a concentration time of2 hours. Calculate:a) What is the design peak flow?b) What is the impact of the runoff coefficient (C) range on your design?c) After you implemented your project, the residential area was entirely converted toindustrial areas. Would that affect you design? If yes, by how much?

The Orange County Water District (OCWD) requires that the flow velocity in a water pipe cannot exceed 7 ft/s. Given a discharge of 3200 GPM, which of the following pipes is the BEST option? O NPS 8, schedule 80 O NPS 6, schedule 60 O NPS 4, schedule 40 O NPS 10, schedule 100