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<br />. <br /> <br />. <br /> <br />('Ij <br />l1? <br />l1? <br />rl <br />C) <br /> <br />--- <br />~.' <br /> <br />and sediment in the Rio Grande valley, increase in biological productivity of <br /> <br /> <br />the valley and of the watersheds of the Rio Puerco and Rio Salado, and <br /> <br /> <br />enhancement or preservation of biological and cultural resources of the <br /> <br /> <br />entire area. By August 1982 we will recommend implementation of one or more <br /> <br /> <br />of the following alternatives: flood and sediment control dams near the mouth <br /> <br /> <br />of the Rio Puerco and the Rio Salado, reconstruction of levees between the <br /> <br /> <br />Rio Grande and the conveyance channel from San Acacia to Bosque del Apache <br /> <br /> <br />National Wildlife Refuge, and extensive grazing management, grazing improve- <br /> <br /> <br />ments, and low wire-tied rock check-dams throughout critical erosion areas of <br /> <br /> <br />the two watersheds. <br /> <br />c. Sedimentation. A qualitative geomorphic analysis of the response of <br /> <br /> <br />the Rio Grande to the operation of Cochiti Lake was completed in December <br /> <br /> <br />1980. This effort is described in a report to the District by LTC Peter F. <br /> <br /> <br />Lagasse of the U.S. Military Academy in West Point, N.Y., and is based on <br /> <br /> <br />analyses of pre-dam and post-dam data collected by the U.S. Geological Survey <br /> <br /> <br />in a reach of the Rio Grande from Cochiti Dam to near Isleta, N.M. <br /> <br />A detailed qualitative and quantitative study was initiated that will define <br /> <br /> <br />the hydraulic and sediment characteristics of the Rio Grande Basin from <br /> <br /> <br />Elephant Butte to Cochiti Dam with particular emphasis on the Rio Puerco and <br /> <br /> <br />Rio Salado. This study will result in computer applied sediment and water <br /> <br /> <br />routing mathematical models and will estimate the long term effects of the <br /> <br /> <br />operation of the existing features of the Middle Rio Grande Project and <br /> <br /> <br />proposed flood and sediment control measures on the Rio Puerco and Rio <br /> <br /> <br />Salado. <br /> <br />d. Albuquerque Levee Study. The Middle Rio Grande Flood Protection, <br /> <br /> <br />Bernalillo to Belen, New Mexico, Interim Feasibility Report recommending a <br /> <br /> <br />$35.6 million project of raising and rehabilitating 62.3 miles of levee <br /> <br /> <br />between Bernalillo and Belen was completed in 1980. In April of 1980 the <br /> <br /> <br />Board of Engineers for Rivers and Harbors made recommendations to the Chief <br /> <br /> <br />of Engineers concerning the reports' adequacy in responding to the study <br /> <br />2 <br />