WSPC03144

• File Number: 8283.200
• Description: Colorado River Basin-Colorado River Computer Models-Colorado River Decision Support System
• State: CO
• Basin: Colorado Mainstem
• Water Division: 5
• Date: 6/12/1996
• Title: Boyle IIIa WRP Enhancement-Phase IIIa Scope of Services-Tasks 1-11-Draft
• Water Supply Pro - Doc Type: Operating Principles/Plan

1070

Subtask 2.01

Phase II Instream Flows

Objective:

Modify Phase II model input to reflect changes in the way instream flow reaches are
specified to Statemod. This subtask brings the model application into conformance
with the current version of the code before the application itself is enhanced.

*

Approach:
L STATE: Modify STATEMOD program to consider upstream and downstream terminus of
instream flows to avoid the current necessity of duplicating the same instream flow below
each structure in the reach,
2, RTIWR: Modify Phase II 'historic', 'calculated', and 'baseline' data sets to reflect a dual
terminus treatment of instream flow reaches. Specifically, change the river network file to
remove "extra" instream flow nodes, edit or recreate the ,dds file as necessary, and edit
instream flow files to reflect new data input format: Return flow locations should be
reviewed and changed if necessary to make sure that every return flow re-enters the stream
at an existing node.
3. RTIWR: Execute the modified model with the Phase II 'calculated' and 'historic' scenario
demand set. With the "big pictur~ plot" feature of the Statemod GUI, prepare a single big
picture plot comparing (annual average diversion) for the modified model output to the
Phase II output. The big picture plots will be supplied to the State, and if large differences
are noted, the State will be responsible for additional modifications or executions or
comparisons (possibly requiring a change order),
4. STATE: Document the modification of STATEMOD input files to represent upstream and
downstream terminus and the comparison of the Phase III and Phase II runs in a 1-2 page
draft memorandum. RTI will review memorandum and provide written comments to the
State,
5. STATE: Finalize memorandum.

Deliverables:
1, Modified Statemod Program to consider upstream and downstream terminus of instream
flows.
2. Modified Phase II input data sets to reflect dual terminus treatment of instream flows,
3. Two model executions, and two big picture plots comparing the average annual diversions
between the Phase II output and the modified model output.
4, Draft memo
5. Final memo documenting the modification of STATEMOD input files to represent upstream
and downstream terminus and the comparison of the Phase II and modified model output.

Subtask 2.02

Map Preparation

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Prepare an electronic and hard copy map of irrigated lands, headgates, hydrology, and
baseflow nodes, differentiating between that modeled in Phase II and remaining to be
modeled in Phase 1II. This map will be a useful aid in spatial aggregation of diversion
structures,

Objective:

Phase IlIa Scope of Services

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June 12, 1996

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