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<br />, <br />, <br /> <br />ex> <br />en <br />.n <br />,...; <br />c'" <br /> <br />(......, <br />_. <br /> <br />REPORT ON THE CIVIL WORKS ACTIVITIES OF THE ALBUQUERQUE DISTRICT <br /> <br />CORPS OF ENGINEERS IN THE RIO GRANDE BASIN <br /> <br />DURING CALENDAR YEAR 1997 <br /> <br />1. GENERAL. During Calendar Year 1997, activities of the U.S. Anny Corps of Engineers <br />(Corps), Albuquerque District, in the Rio Grande Basin varied widely. These activities consisted of <br />reservoir regulation, flood control studies, design and construction, operation and maintenance of <br />flood control structures, planning assistance, flood plain management services, and the regulation of <br />dredged or fill materials into waterways. <br /> <br />2. WATER CONTROL OPERATIONS. In 1997, the Rio Grande Basin snowmeh runoff was <br />above average with most areas observing about 120 to 140% of nonna!. There were no large storm <br />events to note during the year. Special operations in the Rio Grande Basin below Cochiti Dam for <br />the endangered Rio Grande silvery minnow continued. Monitoring of irrigation deliveries and flows <br />below San Acacia diversion dam resuhed in extensive communications between the Corps, Middle <br />Rio Grande Conservancy District (MRGCD) , Bureau of Reclamation (Reclamation), and U. S. Fish <br />and Wildlife Service (Service). <br /> <br />a. Cochiti Lake. In February (18-20) water from the recreation pool was used to raise the <br />release sufficiently to cause a I-foot rise in the Rio Grande through Albuquerque. This increased <br />release (1,000 cfs over the natural flow) was at the request of the city of Albuquerque and the <br />Geological Survey to facilitate a study on groundwater interaction with the river. The lake reached <br />a maximum pool elevation of 5354.23 (79,792 acre-feet) on May 27. The maximum release was <br />6,830 cfs. <br /> <br />b. Abiquiu Reservoir. The reservoir reached a maximum pool elevation of 6221.05 feet <br />(193,634 acre-feet) on June 9. The maximum release was 1,800 cfs. At the request of Reclamation, <br />approximately 8,000 acre-feet of flood storage was retained in Abiquiu on 18 June and evacuated <br />during the 23-30 June time period. This was during the recession period of the snowmeh runoff on <br />the mainstem of the Rio Grande. The delayed evacuation was used to hold the flows sufficiently high <br />enough through June so that Reclamation could complete a portion of a study on the Low Flow <br />Conveyance Channel near Socorro, New Mexico. The rest of the year Abiquiu Reservoir was <br />regulated to pass inflow and to supplement irrigation water. <br /> <br />1 <br />