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LIFE OF RESERVOIR
- Any reservoir cannot last for ever.
- Ultimately all the reservoirs get silted up.
- Silting of the reservoir starts from the day it is created.
- When reservoirs are created some of its capacity is left unused.
- This is the capacity of the reservoir lying below the crest level of the bottom most under sluices.
- This storage capacity which remains unused is know dead storage.
- This dead storage capacity is used to accommodate deposited silt so that effective storage of the reservoir is not affected.
- So long as dead storage capacity of the reservoir is not silted completely, effective storage or useful storage capacity is not affected.
- The process of silting continues even after complete silting of dead storage.
- The further silting affects the effective storage of the reservoir and the reservoir does not have enough water to fully fulfil its obligations.
- Generally useful life of the reservoir is considered terminated when its effective storage is reduced by 20% of the designed capacity of the reservoir.