Irrigation Engineering
In case of a trapezoidal notch fall

Splay downstream from the notch section is 22½°
Top length of the piers should not be less than their thickness
Splay upstream from the notch section is 45°
All listed here

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Irrigation Engineering
The intensity of irrigation means

Percentage of gross commanded area to be irrigated annually
Percentage of culturable commanded area to be irrigated annually
Total depth of water supplied by the number of waterings
Percentage of the mean of culturable commanded area and the gross commanded area to be irrigated annually

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