WSPC05997

• File Number: 8283.100
• Description: Colorado River Basin-Colorado River Computer Models-Colorado River Simulation System Reclamation
• State: CO
• Water Division: 5
• Date: 10/1/1981
• Author: BOR
• Title: CR Colorado River Simulation System CRSS-Corres Reports etc-1973-82-BOR-Colorado River Simulation System-An Executive Summary
• Water Supply Pro - Doc Type: Report/Study

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by either a minimum release rate, a flood space
storage reqUirement. d.........ds which draw from
the racnoir, tI.........tI. which draw from
....,..-.. reservoirs ancl move water through the
reservoir, or the "Laws of the River." The
operations of Lakes Powell and Mead are 1arge-
ly determined by the criteria ancl consttaints
rcIating to the "Laws of the River." An caIcuIa- .
tioDs for raa,oir operations are based 011
IIlOthcr form of the continuity equation:

c.....v in storage ,. Intlow - Outflow. -
E...........aioa - c.....V in bank stoiage

E'IlIPOI'lItioD. baDIt storage, aDd power produc-
tioIl are ...."""IIIt"" each time water is moved'
tbrouaI1 a imr,o;'. Evapo.4ion is determined
by a IIIOIIthIy .....,m,.;_ aDd the surface. area
of the lake that IDODth. Qange in bank storage
is. .......dat.,l. as" a ~.. ......:iar. of the Mump in
MIl~ storage' each 1IIftII'th- . TIIis ~(#ll;~r
raIJ&IIIt from 6.5_.-1 in Lab Mead to'lS
_.:etIt in Lake PowelL .

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After the entire system is in hydrologic: bitJance.
...Iiniri.... ant computed throughout the system
by amass t>-ol........lJl:C01UltiDg p..xedure. Initial
...Ii.riri.... are read in from the hydrology tile.
Salt pickup or ICIIIlMII is read in from the de-
mand file. The ~ of the'saIt pickup or re-
moval is brought into the river by the rctum
. flow of aD \l...,..;lItefl diversion.

To route salt through a. reservOir, complete
milling is assumed. This, approach, in a simpli-
lied form, was vermed by Dr. John Hendrick
in his Ph.D. dissertation (1m), Colorado
State UDiversity, as applicable to Lake Mead
on a monthly basis. The concenuation of salt
in the outflow. is assumed equal to a weighted

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average of the beginning aDd ending concentra-
tioos of the salt in the reservoir.

Operational Control Data

Operational control data are input to the
CRSM and include: reach idetlrin....rion and
basin configuration; reach description data
(location and identifiarion of diversioos,
rctum .flows, inflows, and reservoirs); reservoir
ancl powaplant c:haracteristia data; data con-
trolling output options and various run param-
eters (i.e., starting ancl ending dates, etc.); and
mi-"""eQUS data which control the opera-
tions ancl conditions specific to the Colorado
River Basin.

Rescnoir operatioDal c:haraI:teristics data are
. entcftd in the- form of polynomial equations
for the foDowing:.

1. Rmrroir eIeYation-area-capacity.
reIatioDships
2. Turbine horsepower output at run
gate wrsus head
3. Discharge versus head
4. Tailwater eIeYation versus flow

Polynomials for the reservoir elevation-area-
~ curves are scIected to reproduce the
tables used in the operations of the reservoirs.

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

1. Target capacities for each month -
rule curves
2. Bank storage coefficients

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