WSPC03736

• File Number: 8283.100
• Description: Colorado River Computer Models - Colorado River Simulation System - Reclamation - CORSIM
• State: CO
• Basin: Colorado Mainstem
• Water Division: 5
• Date: 7/1/1973
• Author: Richard W Ribbens
• Title: Program NWO1 - River Network Program - Users Manual
• Water Supply Pro - Doc Type: Report/Study

00205Q

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Reservoir Inputs - ~lu1tiple Reservoir Operations (Card Types 4-1,
9-1, 9-3)

When the segment data and reservoir status results in at least
two available reservoirs, the problem of allocating water from
storage from each to meet demands arises. This is resolved
by using the release rule code, IRRCO, on the 9-1 Card. The
following options are available:

IRRCO=l, percentage allocation. - The percentages contained
on the segment Card 4-1 are used to distribute releases
among the reservoirs. If for any reason one of the
reservoirs cannot make its release, a shortage will exist
which is not met by increasing releases from the remaining
reservoirs.

.

IRRCO=2, balanced operation. - The philosophy used is that
releases are to be made to keep the same percentage of the
normal operating zone's capacity full (i.e., Zone II,
extending from the top of dead storage to the spillway
crest). This concept will be clarified by considering the
computational approach.

First, the ratio of the water available above the dead
storage level, including that in the banks, to the total
amount. of water in the normal operating zone is computed
for each reservoir as:

RATIO =

(V-Vos) (l+BANK)
(VSC-Vos) (l+BANK)

from which

RATIO =

~~~
(VSC-VOS)

(4)

where RATIO is the portion of the normal
zone filled

(dimensionless)

V is the existing surface storage
volume (L3)

VOS is the dead storage volume (L3)

VSC is the spillway crest volume (L3)

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