WSP05214

• File Number: 8141.700
• Description: Fryingpan-Arkansas Project - Annual Operating Plans and Reports
• State: CO
• Basin: Arkansas
• Water Division: 5
• Date: 11/1/1989
• Author: US DoI BoR
• Title: Annual Operating Plan Fryingpan-Arkansas Project Colorado 1989 - 1990
• Water Supply Pro - Doc Type: Annual Report

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IV. OPERATION PLAN FOR WATER YEAR 1990

A. General

Three potential operations have been considered for available
facilities of the Fryingpan-Arkansas Project in conformity with
established operating criteria under assumed conditions of inflow. Two
of these represent operat i ng cond i t ions that wou 1 d be experi enced if
runoff during water year (WY) in 1990 is extremely high or low.
Divertable flows during W.Y. 1990 have a 1-in-10 chance of being greater
than the reasonaole maximum and a 1-in-l0 chance of being less than the
reasonable minimum. Therefore, actual operations in 1989-1990
statistically have an 8-in-10 chance of falling between the two extremes.
The third potential operation represents most probable diversions and
operating conditions.

In considering potential operation plans, it was intended to provide the
necessary fl exi b i 1 ity to change from one set of cond it ions to another.
Changing conditions will require adjustments to the proposed operation
plan. Forecasts of the April-July runoff will be initiated in February
1990 and cont i nue dur i ng each succeed i ng month through May. These
forecasts are based upon the Soi 1 Conservation Service's monthly snow
survey, most probab 1 e preci pi tat i on for the remai nder of the season,
and historic runoff patterns.

The contract with Southeastern Colorado Water Conservancy District
requires that by May 15 notification be given of the quantity of water
that will be available for sale to the district. This quantity is in
excess of the buildup of storage necessary for minimum pools and power
operation, evaporation, and transportation losses.

B. Ruedi Reservoir

Ruedi Reservoir will be operated during 1989-1990 to optimize control
of spri ng runoff, recreat i ona 1 interests and downstream fi shery
requirements. This is an interim plan until a long-term market is
developed for that water. Short term sales may be made on a year-to-
ye~r basis as need develops.

1. Inflow

Under most probable conditions, the annual inflow will be
131,500 acre-feet. Under maximum and minimum probable conditions annual
inflow will be 197,800 and 83,800 acre-feet respectively.

2. Minimum Release

The fishery bypass requirements, as described in the qperating Principles,
are 39 ft3/s from November through April and 110 ft3/s from May through
October or inflow whichever is less.

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