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
minimum pool level and maximum pool level
normal pool level and maximum pool level

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Irrigation Engineering
Which one of the following statements is correct?

The drainage system runs along the lowest line, collects drainage water from the slopes and joins the main stream
The canal system runs on ridges, gets divided into smaller channels and spreads its water on the land
All listed here
The canal system and the drainage system are complementary

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