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原文传递 Hephaixt Butte Reseivoir 1999 Reservoir Survey

题名：	Hephaixt Butte Reseivoir 1999 Reservoir Survey
作者：	Kent Collins and Ronald Ferrari
关键词：	reservoir area and capacity/ sedimentation/ reservoir surveys/ sonar/ sediment distribution/ contour area/ reservoir area^ sedimentation survey/ global positioning system
摘要：	The Bureau of Reclamation (Reclamation) surveyed Elephant Butte Reservoir in the spring of 1999 to develop a topographic map and confute a present storage-elevation relationship (area-capacity tables). The underwater survey was conducted between reservoir elevation 4,3942 and 4,396 feet datum is 433 feet less than NAVD29). The underwater survey used sonic depth recording equipment interfaced with a global positioning system (GPS) that gave continuous sounding positions throughout the underwater pardons of the reservoir covered by the survey vessel. The reservoir topography was determined by importing digital images of the contour lines from the U.S. Geological Survey quadrangle (USGS quad) maps of the reservoir area. The new topographic map of Elephant Butte Reservoir was developed firm the combined 1999 underwater measured topography and the USGS quad contours. As of April 1999, at reservoir water surface elevation (feet) 4,407.0, the surface area was 35,984 acres with a total capacity of 2,023,358 acre-feet Since the reservoir ’ s initial filling in 1915,611,442 acre-feet of sediment have accumulated in Elephant Butte Reservoir. Since the last reservoir survey in 1988,41,652 acre-feet of sediment have been trapped. The average annual rate of sediment accumulation since 1915 is 7,253 acre-feet and since 1988 3,719 acre-feet
报告类型：	科技报告