Section 4: Soil and Water Conservation Engineering
Soil and Water Erosion
Subtopic: Gully control structures – drop, drop inlet and chute spillways
Question Statement:
For hydrologic design, the entire runoff hydrograph should be known in case of
Options:
(A) Drop spillway
(B) Chute spillway
(C) Drop inlet spillway
(D) Ogee spillway
Official Answer Key:
C
Step-by-Step Solution & Explanation
A drop inlet (riser/pipe) spillway typically works together with detention storage behind a small dam/pond; its design requires flood routing through the reservoir, which needs the complete inflow hydrograph (shape and volume), not just peak discharge. Drop, chute and ogee spillways are usually sized directly from peak discharge alone since they pass flow without significant storage/routing effects.
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