WSP11585

• File Number: 8445
• Description: Union Park
• State: CO
• Basin: South Platte
• Water Division: 1
• Date: 10/1/1989
• Author: WRC Engineering
• Title: Engineering Report fo the Union Park Project Water Rights
• Water Supply Pro - Doc Type: Report/Study

I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I

The study further developed virgin inflows at selected gaging
stations. CWR&PDA has stated that the virgin inflows were developed
by adjusting gaged flows to reflect historical irrigation
depletions, reservoir storage and evaporation, transbasin diversion,
bank storage, and in some cases, by extension of record by
correlation. Estimates of historical irrigation depletion were
based on calculations of potential crop consumptive use and
irrigated acreage.

A detai led computer model of the water resources of the basin was
developed by WBLA, Inc. as a sub-consultant to HDR Engineering, Inc.
The model simul ated the _operati on of the river system for the
1952-1983 period. Water in the basin was identified and allocated
to different demands based on the priority dates of the water
rights. Specific instream flow requirements and conditional water
rights were operated to detennine the amount of water available for
export purposes. The study concluded that there was various amounts
of water available for export based upon various operational
scenarios.

C. WRC's Analysis and Determination of the Project Yield
When reading this section of the report, it is suggested that the reader
refer to Table / 111-8 in order to facilitate the ease of following the
different assumptions related to different approaches and scenarios.

-30-