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

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

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Irrigation Engineering
A river is said to be of

All of these
Aggrading type if it builds up its bed to a certain slope
Degrading type if it cuts its bed to a certain slope
Meandering type if it flows in sinuous curve

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