hydraulic structures - river engineering and urban...
TRANSCRIPT
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INTRODUCTION
SPILLWAY
Dispose flood water in excess of reservoir capacity
Control of discharge over spillway by gate operation
Type of energy dissipator provided
Efficacy of Energy dissipator downstream of spillway
Ski-jump bucket , Stilling Basin, Roller bucket, Stepped Spillway,etc.
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Ski-jump bucket throws the jet away from lip depending on velocity & bucket lip angle
Scour occurs d/s of lip of bucket.
to prevent uncontrolled scour of river bed and banks
1. pre-excavated plunge pool is provided.
2. raising tail water level by constructing weir sufficiently d/s.
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