Irrigation Engineering
As compared to crest of the normal portion of the weir, the crest of the under sluice portion of weir is kept at

any of the above depending on the design
same level
lower level
higher level

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Irrigation Engineering
Effective precipitation for a crop may be defined as

Total precipitation minus the loss due to evaporation
Total precipitation minus the loss due to infiltration
Available water stored in soil within root zone of the crop
Total precipitation during the crop period

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