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United States Department of the Interior

BUREAU OF RECLAMATION
EL PASO FIELD DIVISION
700 SAN ANTONIO AVENUE, RM. 710
EL PASO, TEXAS 79901-7020

IN REPLY REFER TO:

         EP-433
         PRJ-13.10

Lieutenant Colonel Raymond G. Midkiff
District Engineer, Corps of Engineers
4101 Jefferson Plaza NE
Albuquerque, New Mexico 87109

 
Subject:Rio Grande Project Water Operations (Elephant Butte and Caballo Reservoirs) Operations Plan for July 2001>/p>

Dear Colonel Midkiff:
Enclosed is the record of actual daily operations for Elephant Butte and Caballo Reservoirs for June 2001. Actual daily and end-of-month storage, inflow, and outflow figures are indicated by asterisks. All other data are projected and are SUBJECT TO CHANGE.

Cochiti Dam releases during June were about 115,500 acre-feet, and combined with Rio Grande middle valley demand and river transportation losses of 65,600 acre-feet, resulted in a provisional total flow at San Marcial gages of 49,910 acre-feet during this month. This inflow to the Rio Grande Project resulted in a combined Elephant Butte and Caballo Reservoirs' storage of 1,120,340 acre-feet by the end of the month.

Releases from Elephant Butte Reservoir totaled 104,100 acre-feet; 131,300 acre-feet were released from Caballo Reservoir to meet irrigation demand downstream.

Irrigation demand increased in June reflecting it in the releases from Caballo Reservoir which averaged 2,206 cfs during this month with a maximum of 2,522 cfs and a minimum of 1,864 cfs.

In order to keep Caballo Reservoir levels up, the Elephant Butte Power Plant started bypassing water through the balance valves on June 22 and continued for several days through July, at a rate of about 3,500 cfs during day time and a base flow of about 1,450 cfs during night time.

Elephant Butte Reservoir peaked at an elevation of 4383.24 feet and a storage of 1,306,100 acre-feet on January 31 and it is projected to be at its lowest point on October 14 at an elevation of 4362.47 feet and a storage of 851,300 acre-feet, that is 5.41 feet and 104,900 acre-feet less than last month's projections; that is due to the fact that the forecasted flow at San Marcial did not materialized.

Caballo Reservoir peaked on March 9 at an elevation of 4158.36 and a storage of 115,100 acre-feet. It is projected to be at its lowest point on October 10 at an elevation of 4128.14 feet and a storage of 6,080 acre-feet, that is 0.15 foot and 190 acre-feet more than last month's projections.

The updated monthly plan for July includes the historical monthly data from January 2000 through June 2001, and projected data from July 2001 through the end of 2002. Also enclosed are daily reservoir operation plans for June through September 2001.

Sincerely,
Filiberto Cortez
Manager, El Paso Field Division

Encl - 5

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