WSPC12493 ‎(2)‎

• File Number: 8220.101.10
• Description: Colorado River Water Projects - Glen Canyon Dam-Lake Powell - Adaptive Management
• State: CO
• Basin: Colorado Mainstem
• Date: 4/1/1996
• Author: DOI-BOR
• Title: CRSSez - Annual Colorado River System Simulation Model - Overview-Users Manual - Update of 04-01-96 - With Revisions of 09-01-96 - 04-01-96
• Water Supply Pro - Doc Type: Report/Study

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oOn297

Demand Data:

Normal and surplus consumptive uses are provided by the Lower
Basin states and the Upper Colorado River Commission. The
demands for each user are combined as described above. See the
USER section below for more details on the CONUSE.DAT Demand
file.

Hydrology Data:

The historic hydrology gains are taken directly from the CRSS
hydrology MHYDRO output file and combined as described above.
Gains in the Lower Basin have been adjusted in MHYDRO to reflect
unmeasured return flow estimates for use with depletion schedules
credited with these unmeasured return flows.

Also, stochastically generated hydrology may be used. 58,000
years of hydrology is available to provide enough independent
traces for statistical analysis. The stochastic data has the
same statistical properties of the 1906-1990 historical record.

In addition to the hydrology gains in CRSS, the Gila River is
optionally available. The Gila River has a median flow of zero,
and has an adjusted maximum annual inflow that is deliverable to
Mexico of about 1 million acre-feet, in lieu of releases from
Mead.

GENERAL MODELING PROCEDURES

General Routing Procedure:

1) Begin with gain above Glen Canyon Dam.

2) Deduct Upper Basin shortage from scheduled Upper Basin use.

3) Deduct shorted use from gain.

4) Determine storage change for Upper reservoir above Powell.
a. Compute initial storage change in Upper reservoir for
depleted gains based on change-runoff relation.
b. Determine beginning of year total Upper Basin
content/capacity ratio.
c. Depending on Glen power head and content ratio determine
Upper reservoir target contents.
d. Limit computed storage change to target contents.

5) Remove Upper reservoir storage change and evaporation from
adjusted gains above Glen.

6) Determine Mead flood control and surplus release.
a. Compute Powell inflow forecast as depleted and regulated

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