• Effect of changing inflows on the values of capacity and demand.
• Analysis of relationship between the numbers of days that water cannot be
supplied (N J ) with changed inflows.
• Possible effect of climate change on reservoir performance.
V TEST = V 1 + (Q IN – Q OUT ) ∆T
V MIN > V TEST
Q OUT = 0 (no
water supplied)
V 2 = V 1 + Q IN .∆T
N J = N J + 1
Q OUT = OK (water
supplied)
V 2 = V TEST
NO
YES
V 2 > V MAX
V SPILL = V SPILL +
(V 2 – V MAX )
V 2 = V MAX
YES
New V 1 = Previous V 2
End of Q IN
V FINAL
= V 1
Number of days water not supplied
= N J
Volume Spill
= V SPILL
Maximum Capacity of impoundment
= V MAX
Demand flow rate
= Q OUT
Demand supplied (Minimum Q OUT and Maximum Q OUT )
NO
YES
NO
Maximum Capacity of reservoir
= V MAX
Minimum Capacity
= V MIN
Initial Volume
= V 1
Demand flow rate
= Q OUT
Demand
= to calculate
Time lapse
= ∆T
Number of days water not supplied
= N J = 0
Spill volume through spillway
= V SPILL = 0
NO
Fig. 13.2 Algorithm for simulating reservoir flow operations
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13 Modelling in Infrastructure Planning