Discussion
__________ kind of permanent soil and water conservation structures are preferred when the purpose is to capture a part of runoff inside the stream (upstream side) for its use for lift irrigation or ground water recharging ; and at the same time passing other fraction of stream flows with safe velocities during peak flows.
Answer: B
The structures are Drop inlet structures.
In a drop inlet spillway, water upstream rises to the crest of a vertical inlet (riser) before it can drop into a conduit that carries it under the embankment. The pool held upstream up to the crest can be used for lift irrigation or allowed to recharge groundwater, while peak flows pass safely through the conduit, which is the combination the question describes.
A drop structure (straight drop spillway) mainly lowers the stream bed in steps to control gully erosion, and a culvert simply carries water under a road. Gabion structures are loose-rock check dams that slow flow but are not designed to store water for lifting.
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