To calculate the 100 year floodplain extent, we first utilize a design storm from the IDF curves, perform a rainfall-runoff analyses and finally, calculate water levels and inundation extent with an open channel flow model. O True O False

(a) A flood drainage channel has to be designed to carry runoff from 200 km² area. If the flow per square kilometer is 0.5 m³/s/km², determine the flood drainage channel size using (i) the permissible velocity method, and (ii) tractive force method. The material size is 2 mm and S,=0.00002. Provide sufficient justification for assumptions and/or judgement used in your procedure. State clearly the design steps used in the design process. (b) The reservoir level upstream of a 30-m-wide spillway for a flow of 800 m³/s is at El. 250 m and downstream river level channel for this design flow is at El. 150 m. If the stilling basin width is the same as that of the spillway, compute the floor level of the stilling basin so that the jump is formed in the basin. Assume the losses in the spillway are negligible. What would be the basin invert level if one can use an end sill or one row of baffle blocks and an end sill? (c) A mountain creek with a flow rate of 100 ft/s passes through an eight-ft…

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