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Design a regime channel for discharge of 50cumec and silt factor 1.1. Use Laceys theory.
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Solution :

Given :

Q=50 cumec

Lacey's silt factor F=1.1

Design steps by Lacey's theory :

1) Calculate velocity of flow,

V=(QF2140)(1/6)=(50×1.12140)(1/6)=0.8695m/s

Where,

F= silt factor

2) Calculation of area of cross-section of canal,

A=QV=500.8695=57.50m2

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