PUB00053

• Year: 1999
• Title: Metropolitian Water Supply Investigation Final Report
• Author: Hydrosphere Resource Consultants
• Description: Metropolitian Water Supply Investigation Final Report
• Publications - Doc Type: Water Resource Studies

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Metropolitan Water Supply Investigation

MWSI Process

Throughout the MWSI process, as TAC members learned more about each others' water
supply systems, new ideas for cooperative opportunities emerged which required
redirection of study efforts and gathering of additional information. While this approach
caused significant delays, it was necessary for maintaining flexibility throughout the
MWSI so that work plans could be formulated and modified as necessary in response to
the TAC's deliberations.

As the MWSI evolved in response to direction from the T AC during Phase II, the
originally anticipated approach was modified to include more analysis and the
formulation of conceptual designs in the area of conjunctive use than was originally
anticipated. While under the original POS these efforts would have taken place during
Phase IV of the MWSI, the overall thrust of the MWSI did not change. However, this
shift in the focus resulted in some reduction in the Phase II efforts originally anticipated
for the areas of effluent management and systems integration.

The Phase II inventory of available models concluded that the MWSI's analytical
approach for yield and operational purposes would be to rely on Denver's Platte and
Colorado Simulation Model (P ACSM) as a basic analytical tool and to develop "model
extensions" for further MWSI investigations. This decision was based on two basic
factors: the importance ofthe operation of Denver's system when considering cooperative
water supply options, and Denver's position of openness with respect to availability of
P ACSM model data and assumptions. This resulted in a collaborative effort with Denver
in the use, review and refinement ofPACSM during the remainder of the MWSI process,
Additional models, designed to run as "extensions" ofP ACSM, were developed by the
MWSI as parts of specific investigations. A description ofPACSM is provided in
Appendix 6.

Efforts under the Phase II ofthe MWSI were substantially completed in August of 1995
with the publication of numerous Phase II task memoranda, four summary reports
specific to each conceptual water supply category, and a Draft Phase III POS which was
finalized in October of 1995.

2.2.3. Phase III Investigations

The Phase III POS included a mix of work areas designed to advance the treatment of
effluent management to a level comparable to the Phase II analysis of conjunctive use
options. The PMT felt that more detailed studies in the area of conjunctive use were not
necessary with the exception of some additional model runs to evaluate certain
conjunctive use scenarios. In addition, Phase III included efforts to increase the level of
T AC discussions regarding other systems integration ideas. As with the previous phases
of the MWSI, the TAC wanted to retain flexibility so that efforts could be re-directed as
needed in response to new information and changing priorities.

In the area of conjunctive use, additional model runs were completed using the model
developed in Phase II (with some minor modifications). These model runs were designed
to produce analyses in the following areas:

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Prepared for the Colorado Water Conservation Board, Colorado Department of Natural Resources by
Hydrosphere Resource Consultants, 1002 Walnut Street, Suite 200, Boulder, CO 80302