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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CRSM

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* SURPLUS
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COMPUTE REQUIRED 602(A) STORAGE IN THE UB RESERVOIRS:
NUMBER OF YEARS OF SEDIMENT ACCUMULATION IN POWELL ~ CURRENT YEAR - 1963.
AVERAGE ANNUAL UB DEPLETION ~ AVERAGE OF ANNUAL DEPLETIONS FOR THE NEXT 12
YEARS + AVERAGE ANNUAL UB EVAPORATION. (12 YEARS IS THE CURRENT CRITICAL
PERIOD OF RECORD, BEGINNING IN 1953.)
REOUIRED STORAGE = AVERAGE ANNUAL UB DEPLETION REDUCED BY AN ALLOWABLE
SHORTAGE OF 6.12% + 8.23 MAF ASSUMED MINIMUM ANNUAL DELIVERY REQUIREMENT
12.18 MAF AVERAGE NATURAL FLOW AT LEES FERRY FOR THE 1953-1964 PERIOD, ALL
TIMES 12 (THE CRITICAL PERIOD).
REQUIRED STORAGE = REQUIRED STORAGE + 5.179 MAF VOLUME NEEDED TO MAINTAIN
MINIMUM POWER POOL IN POWELL.
REQUIRED STORAGE : REQUIRED STORAGE + ANNUAL SEDIMENT ACCUMULATION ABOVE
MINUMUM POWER POOL AND DEAD STORAGE (78% OF THE TOTAL ANNUAL ACCUMULATION)
TIMES THE NUMBER OF YEARS OF SEDIMENT ACCUMULATION IN POWELL.

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*>>* APPOR *

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IF THE -OPERATION STRATEGY: 0, SET THE MONTHLY DELIVERY TO CAP & MWD TO THEIR
NORMAL DELIVERY SCHEDULES (I.E. NO SURPLUSES ARE SCHEDULEO).
IF 105(6)23, BYPASS SURPLUS AND SHORTAGE COMPUTATIONS -- OTHERWISE CALL APPOR:

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COMPUTE SURPLUSES OR SHORTAGES:
IF THIS IS THE FIRST MONTH OF THE RUN. COMPUTE INITIAL VALUES AND
SET SHORTAGE AND SURPLUS FLAGS : O.
seT MONTHLY SHORTAGE VALUES = O.
IF MONTH.NE.10, SKIP DOWN TO "BEGIN SURPLUS MONTHLY DISTRIBUTIONS."

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BEGIN SURPLUS COMPUTATIONS:

SET SURPLUS FLAG = O.
SET POWELL MONTHLY RELEASES' MONTHLY RELEASES SCHEDULED TO MEET THE MINIMUM
DELIVERY REQUIREMENT.
POWELL MINIMUM ANNUAL RELEASE SUM OF POWELL MONTHLY RELEASES.

[COMPUTE ANNUAL SURPLUS RELEASE FROM LAKE MEAD:]
COMPUTE ESTIMATEO UB AND LB USES INCLUDING EVAPORATION.
COMPUTE POWELL AND MEAD COMBINED CONTENTS.
IF OPERATION STRATEGY: 0, BYPASS SURPLUS COMPUTATIONS -- SKIP DOWN TO "BEGIN
SHORTAGE COMPUTATIONS."
EOWY (END OF WATER YEAR) COMBINED TARGET STORAGE = CAPACITY OF POWELL AND
MEAD - 70% OF FLOOD CONTROL SPACE REQUIRED ON OCT, 1. (30% IS ASSUMED TO
BE AVAILABLE SPACE IN US RESERVOIRS.)
SURPLUS RELEASE FROM MEAD = COMBINED CONTENTS - EOWY COMBINED TARGET STORAGE +
INFLOW CORRESPONDING TO THE OPERATION STRATEGY ASSURANCE LEVEL - US & LB
USES.
IF SURPLUS RELEASE .LT. 200.000 AF. SET SURPLUS RELEASE = O.
IF SURPLUS RELEASE IS BETWEEN 200.000 AND 300.000 AF.
SET SURPLUS RELEASE = 300.000 AF.
IF SURPLUS RELEASE 0 OR LESS, SKIP DOWN TO "BEGIN SHORTAGE COMPUTATIONS."
SET SURPLUS FLAG = 1 (ON).

[COMPUTE ANNUAL SURPLUS DELIVERIES: J
MAXIMUM SURPLUS TO CAP & MWD D 2 X THE AVAILABLE EXCESS DIVERSION CAPACITY
IN THE AQUEDUCT WHICH HAS THE LEAST AVAILABLE EXCESS DIVERSION CAPACITY.
If CAP CAN NOT YET TAKE A SURPLUS, MWO CAN TAKE UP TO ITS CAPACITY.
SURPLUS DELIVERY TO CAP & MWD = LESSER OF THE MAXIMUM SURPLUS TO CAP & MWD
AND THE SURPLUS RELEASE FROM MEAD.
DISTRIBUTE ON A MONTHLY BASIS THE SURPLUS DELIVERV TO CAP & MWD. PRDPORTIONED
TO EACH AQUEDUCT BY THE RELATION OF THE EXCESS DIVERSION CAPACITY AVAILABLE
IN THE AQUEDUCT FDR THE MONTH TO THE EXCESS DIVERSION CAPACITY AVAILABLE

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