Irrigation Engineering
The useful storage is the volume of water stored in the reservoir between

minimum pool level and maximum pool level
normal pool level and maximum pool level
river bed and minimum pool level
minimum pool level and normal pool level

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Irrigation Engineering
The intensity of irrigation means

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
Percentage of culturable commanded area to be irrigated annually
Percentage of gross commanded area to be irrigated annually

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