WSP09197

• File Number: 8270.100
• Description: Colorado River Basin Water Quality/Salinity -- Misc Water Quality
• Basin: Colorado Mainstem
• Water Division: 5
• Date: 1/1/1981
• Author: USDOI
• Title: Quality of Water - Colorado River Basin - Progress Report No. 10 - January 1981 -- Part 2 of 2 -- Part X - page 99 through end
• Water Supply Pro - Doc Type: Report/Study

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SPECIAL STUDIES (continued)

(a) Reservoir elevation-area-capacity relationships.
(b) Turbine horsepower output at full gate versus head.
(c) Maximum flow versus head.
(d) Tailwater elevation versus flow.

polynomials for
selected to reproduce

the reservoir elevation-area-capacity curves
the tables in general use for the reservoirs.

were

Manufacturer's rating curves were used for the power output of the
powerplants. Other reservoir operation data contained in the control file
are listed below:

(e) Target capacities for each month - rule curves.
(f) Bank storage coefficients.
(g) Evaporation rates for each month for all reservoirs.
(h) Maximum and minimum reservoir capacities.
(i) Maximum and minimum outlet capacities.
(j) Beginning reservoir storage and salinity.

During an actual run of CRSS the control file and the demand file are
combined into one file.

All information in the control file must be
and sequence structure used to model the river.
explained further under Logic Model, CRSM.

referen~~~ to the reach
This structure will be

c. LOGIC MODEL, COLORADO RIVER SIMULATION MODEL (CRSM)

CRSM uses a reach concept to simulate the c9nfiguration of the river
system. The reach structure, set up by the user, forms the pattern for
all inputs and defines the order of computations for the simulation.
Presently, CRSM has the capability to handle 25 reaches. 1ncluded in the
reach structure are three sets of controlling information. These are:

(1) Reach order, reach identification, and destination of outflow
from the reach.
(2) Sequence of inflow points, demand points, and reservoir points
within the reach.
(3) Upstream reservoirs which can provide water for demands within a
reach.

A block diagram of the reach configuration is shown in figure 8.

CRSM Operation

Once all the input data files have been created, the actual simulation
model CRSM can be' run. At the beginning of a run the reservoir operation
data, initial demand data, and the first year of hydrology data are read
in. Trends, capacitiesJ etc., are calculated which set the model up
for the month. A forecast is then estimated for inflow to Lake Powell.
This forecast is based on a perfect forecast with an error term having a
random component added to represent the inaccuracies of actual forecasting
operations.

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