WSP00886

• File Number: 8407
• Description: Platte River Basin - River Basin General Publications
• State: CO
• Basin: South Platte
• Water Division: 1
• Date: 4/16/1990
• Author: BOR
• Title: Annual Operating Plans - North Platte Project Water Years 1989-1990
• Water Supply Pro - Doc Type: Report/Study

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terminal reservoir storage. Carter Lake storage will reach a maximum of
95,200 acre-feet for the water year in late March, and this is
17,000 acre-feet below capacity.

Ourin9 the March 21 through April 28 period, Adams Tunnel and Olympus
Tunnel diversions will be minimized to accommodate the Pole Hill Canal,
Afterbay, and Powerplant maintenance scheduled. As runoff develops in
late April and May, Adams Tunnel diversions will be adjusted to
accommodate runoff timing on the east and west slopes.

Horsetooth Reservoir is expected to reach a storage content of
127,800 acre-feet by the end of May, which is 28,900 acre-feet below the
maximum reservoir storage of 156,700 acre-feet. Restrictions on the
fi 11 ing of Horsetooth Reservoir were 1 ifted on November 27, 1989, and
the reservoir may now be operated to the design maximum water surface
elevation of 5430.00 feet (156,700 acre-feet).

During April and June, a total of 7,600 acre-feet will be released from
Carter Lake to Flatiron Reservoir. This release is necessary to meet
the Big Thompson irrigation demands and the minimum inflow to Horsetooth
Reservoi r during the Pole Hi 11 maintenance and when "sk im" water
diversions are at capacity.

Adams Tunnel diversion will be down to 7,300 acre-feet in June to take
full advantage of operation "skim". Under operation "skim",
approximately 49,200 acre-feet of Big Thompson River water will be
diverted at Lake Estes through the Foothills System during April-September.
The majority of "skim" water (46,400 acre-feet) will be diverted during
May, June, and July.

lrri gat ion demands wi 11 draft Horsetooth Reservoi r storage to
approximately 69,700 acre-feet by September 30. A total of
10,400 acre-feet will be pumped to Carter Lake from May through September
which will bring Carter Lake storage to near 35,000 acre-feet. The
combined east slope terminal storage will be 86 percent of normal at the
end of the water year.

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