Selection of Capacity

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Selection of Capacity

• Selection of capacity depends on
• Physical characteristics
• Inflow outflow characteristics

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Reservoir Storage Zones

• Dead Zone is reserved for sediments deposits.
• Live zone is active zone where outflow
  calculation is based on.
• Flood protection zone is reserved to protect the
  dam from successive high floods.

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Spillway
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Annual Storage

• Annual storage is selected when
• Inflow exceeds the requirements but basin
  topography does not permit long term storage.
• Inflow equals requirements but they do not match
  in timing.

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Mass Curve Method

• The mass curve is used to determine the capacity
  of the reservoir.
• A plot of the accumulated inflow and outflow is
  prepared.
• The maximum difference between the two curves
  represents the required capacity.

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• Example
• Find the required storage for the following
  stream?

Storage m3/month Losses m3/month Outflow (demand) m3/month Inflow (supply) M3/month Month
37 1 7 45 1
73 1 8 45 2
78 1 8 14 3
79 1 8 10 4
76 2 9 8 5
67 3 11 5 6
55 3 11 2 7
44 2 11 2 8
33 2 11 2 9
22 2 11 2 10
11 1 11 1 11
0 1 11 1 12
20 117 137
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