WSPC04476

• File Number: 8283.200
• Description: Colorado River Basin-Colorado River Computer Models-Colorado River Decision Support System-RAY
• State: CO
• Water Division: 5
• Date: 12/29/1993
• Title: Hydrosphere-Colorado River Model-Technical Overview
• Water Supply Pro - Doc Type: Report/Study

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002096

Hydrosphere's Colorado River Model

December 29. 1993
Page 3

· Disposition of water and impacts to power and energy production and
water quality under a market-based water allocation system,

Additional information about some of these studies is available on request.

Outline of this Document

The following sections contain a more detailed description of Hydrosphere's Colorado
River Model. The next section gives a brief description of the physical system that is
represented in our model -- the reservoirs, major diversion structures, river reaches and
inflows. The structure of the model, which uses a network flow algorithm, is described in the
section entitled Model Structure, The next two sections describe the hydrology and demand
data sets which are provided with the model, respectively. The last section describes the river
operations that are captured in the model including water allocation, reservoir operations,
evaporation, hydropower, salinity and minimum streamflow, Special operations resulting from
the Law of the River are also described. These include flood control releases, minimum
objective release from Lake Powell, computation of the 602(a) storage, equalization of the
storage contents in Lakes Powell and Mead, and the declaration and quantification of shortages
and surpluses,

Appendix A contains a list of model elements and Appendix B includes reprints of
papers which discuss some of the analyses Hydrosphere has performed with the model.

Hydrosphere Resource Coosultants 1002 Walnut Suite 200 Boulder, Colorado 80302