WSPC00985

• File Number: 8283.100
• Description: Colorado River Computer Models - Colorado River Simulation System - Reclamation - CORSIM
• State: CO
• Basin: Colorado Mainstem
• Water Division: 5
• Date: 5/1/1985
• Author: DOI-BOR
• Title: CRSS - Colorado River Simulation System - System Overview
• Water Supply Pro - Doc Type: Report/Study

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(9) Water delivered from Lake Mead in excess of normal downstream
demands is distributed equally to Arizona via CAP and California via
MWD. If either CAP or MWD reaches its capacity, the other user can
take rema i ni ng excess up to its capacity. After both CAP and MWD
reach their capacities, remaining excess water flows to Mexico.

The above provisions are normally applied in studies using the CRSS.
Most of the values and procedures described, however, can be easily
modifi ed or bypassed by si rnply changi ng the input data. Therefore,
studies can be made using variations of these provisions; or modifica-
tion to the provisions themselves can be studied using the CRSS.

3. 5Comp~'!.~'!.t.s__o_~t.I!.~ CRS~

The CRSS is composed of a number of programs, data bases, and input data
control files. The relationship between these programs and files is
shown in figure 3.1.

The components of the CRSS can be divided into three parts: the demand
files, the hydrology files, and the CRSM and accompanying input and out-
put files. The demand files are shown in the upper left part of
figure 3.1. These programs and files are described in section 4:
Demand Data. The hydrology files are shown in the upper right part of
figure 3.1 and are described in section 5: Hydrology Data. The CRSM,
control files, and output programs and files are described in section 6:
Colorado River Simulation Model.

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3.6 Basin Configuration

The Colorado River Basin is currently divided into 25 reaches for
modeling purposes. Each reach is then divided into a maximum of
10 inflow points and 10 diversion points.

The basin map found in front of the System Overview shows how the
Colorado River Basin is divided into reaches. Figure 3.2 shows a block
diagram of the reaches. Each block in the figure represents one reach.
Reach 500, the Yampa River, for example, flows into Reach 411, Flaming
Gorge. The reach schematic for Reach 411 (fig. 3.4) shows the Yampa
Rtver as an inflow point to Reach 411, below Flaming Gorge Reservoir.

Figure 3.3 is a typical reach schematic which shows how a reach is
broken down into inflow points and demand points. This reach,
Reach 401, Fontenelle, contains an inflow point (Q+l), a demand with a
return flow (D-l and Q+2), a demand with no return flow (D-2), a reser-
voir (5R+3), and a salinity checkpoint (Q+9).

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The location and relationship of the reaches as shown on the basin map
and figure 3.2 is the configuration normally used. The reach con-
figuration could be rearranged if necessary by modifying the input data
to the model. This is a time-consuming task, but can be accomplished
without revision to the CRSM computer code.

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