2.3.
Constraints
53
Qjmt
Fig. 2.5 Monthly material balance on a reservoir. The numbers in parentheses give
typical monthly flows and volumes in hundreds of thousands of acre-feet.
the reservoir output must be equal to and consistent with the channel flow
input.
Equation (2.13) is the monthly mass balance for each reservoir. Figure
2.5 illustrates the terms involved in the balance. The first term on the righthand side is the sum of all regulated inflows and outflows to and from the
reservoir other than those specified by the other terms.
accumulation
—
Eijt
evaporation
losses
Any junction of two or more flows would reduce to an equation of the
2^ AjmQimt
F%jt
net regulated
municipal and
flow
industrial use
D^t
4*
U %jt
irrigation
unregulated
withdrawal
flow
+ \iiJw
(2.13)
imported
water
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