Question

A depth-discharge relationship of the canal section is maintained at a notch fall because the sill of the notches is

• A. Level with downstream canal bed
• B. Below the upstream canal bed
• C. Level with upstream canal bed
• D. Above the upstream canal bed

Answer 1

The correct option is D

Above the upstream canal bed

Depth-discharge relationship of canal section is maintained at notch fall because crest (sill level) of notches is above the upstream canal bed and there is no heading up or drawdown of water level in canal near the fall.