WSPC05517

• File Number: 8283.200
• Description: Colorado River Basin-Colorado River Computer Models-Colorado River Decision Support System-Ray
• State: CO
• Water Division: 5
• Date: 10/16/1992
• Title: PRYSH-River Simulation System-Technical Reference Manual
• Water Supply Pro - Doc Type: Report/Study

Operation Policies in RSS

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reservoir named ResA is to be detennined, then the variable would be the name
of the outflow slot of that reservoir, This name is "outflow".

TABLE 1, Common variables between Policy Statements Base
and the Simulator

outflow
diversion
endin9-storage
inflow ratio

User defined
variables

Note that other variables can also be defined by the author of policy statements,
This would be necessary, for example, when one policy statement defines how
the value of a variable used in another policy statement is to be determined. For
example, rather than writing one large aU-encompassing expression in a single
policy statement, a number of intennediate expressions could be wrillen in sepa-
rate policy statements before a particular data slot variable value is defined,

If specific values of an object's variable are needed in the condition or definition
sections of the policy statement's body, these values are obtained using the name
of the applicable slot preceeded by the object name and a period. Thus,
ResAOutflow would be the current value of the release or outflow from a reservoir
object named ResA.

Example

Assume for example that the release from a downstream reservoir object named
'Res Down" was to be 30% of the total storage volume in both the downstream
reservoir, 'Res Down", and of an upstream reservoir named "ResUp". Further,
assume the release is to be made from the downstream reservoir if at all possible,
Releases from the upstream reservoir, which flow into the downstream reservoir
~re to be made only if the total required release cannot be made from the down-
stream reservoir,

In this example cine could write a single policy for defining the release or outflow
from the downstream reservoir, '

POLICY D_outflow TO_DETERMINE Outflow
BEGIN
Outflow

FOR ResDown

0_3 * (ResDown.Beginning_storage
+ ResUp.Beginning_storage )

END

This single rule is suflicient in RSS to carry out the described policy, If the volume
of water in the downstream reservoir is not sufficient to make the required release,
an increased inflow will be requested, This increase in required inflow, in turn, will
force an equal increase in the release from the upstream reservoir.

Alternatively, one could write two policy statements to do the same thing. One
policy stalemenl could define a variable named, say, "sum_storage".

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Operation Policies in RSS