WSP05411

• File Number: 8141.700
• Description: Fryingpan-Arkansas Project - Annual Operating Plans and Reports
• State: CO
• Basin: Arkansas
• Water Division: 5
• Date: 11/1/1990
• Author: US DoI BoR
• Title: Annual Operating Plan Fryingpan-Arkansas Project Colorado 1990 - 1991
• Water Supply Pro - Doc Type: Annual Report

I
I
I
f
I
t
I
I
I
t
t
t
t
I
f
f
I
I
f

.) " S :1
..u

IV. OPERATION PLAN FOR WATER YEAR 1991

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 operating conditions that would be experienced if runoff during
water year (WY) in 1991 is extremely high or low. Divertable flows during
W.Y. 1991 have a 1-in-l0 chance of being greater than the reasonable maximum
and a 1-in-l0 chance of being less than the reasonable minimum. Therefore,
actual operations in 1990-1991 statistically have an 8-in-l0 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 flexibil ity to change from one set of conditions to another.
Changing conditions will require adjustments to the proposed operation plan.
Forecasts of the April-July runoff will be initiated in February 1991 and
cont i nue during each succeeding month through May. These forecasts are
based upon the Soil Conservation Service's monthly snow survey, most
probable precipitation for the remainder 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.

8. Ruedi Reservoir

.
Ruedi Reservoir will be operated during 1990-1991 to optimize control of
spring runoff, recreational interests and downstream fishery 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-year basis as need
develops.

1. Inflow

Under most probable conditions, the annual inflow will be 132,800 acre-
feet. Under maximum and minimum probable conditions annual inflow will be
202,200 and 85,100 acre-feet respectively.

2. Minimum Release

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

29