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“Bank storage” in a dam reservoir

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  1. Decreases the computed reservoir capacity

  2. Increases the computed reservoir capacity

  3. Sometimes decreases and sometimes increases the computed reservoir capacity

  4. Has no effect on reservoir capacity

Correct Answer: Option 2 (Solution Below)

This question was previously asked in

MPSC AE CE Mains 2017 Official (Paper 2)


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Zones of storage in a Reservoir:

F2 A.M Madhu 09.05.20 D1


1. Full reservoir Level:

The full reservoir level is the highest water level to which the water surface will rise during normal operating conditions.

2. Maximum water level: 

The maximum water level is the maximum level to which the water surface will rise when the design flood passes over the spillway.

3. Minimum pool level: 

The minimum pool level is the lowest level up to which the water is withdrawn from the reservoir under ordinary conditions.

4. Dead Storage: 

The volume of water held below the minimum pool level is called the dead storage. It is provided to cater for the sediment deposition by the impounding sediment laid in water. Normally it is equivalent to the volume of sediment expected to be deposited in the reservoir during the design life reservoir.

5. Live/Useful Storage: 

The volume of water stored between the full reservoir level and minimum pool level is called useful storage. It assumes the supply of water for a specific period to meet the demand.

6. Bank Storage: 

It is developed in voids of soil cover in the reservoir area and becomes available as seepage of water when water levels drops down. It increases the reservoir capacity over and above that given by elevation storage curves.

7. Valley storage: 

The volume of water stored by the natural river channel in its valley up to the top of its banks before constructing of a reservoir is called the valley storage. The valley storage depends upon the cross-section of the river.

8. Flood/Surcharge storage: 

It is storage contained between maximum reservoir level and full reservoir levels. It varies with the spillway capacity of the dam for a given design flood.

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