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<br />-, <br /> <br />SEDIMENTATION IN JOHN ~lARTIN RESERVOIR <br />ARKANSAS RIVER BASIN, COLORADO <br />RESU~VEY 01' MARCil 1972 <br /> <br />C) <br /> <br />N <br />ex> <br />~ <br />CJl <br /> <br />INTRODUCTION <br /> <br />1. Authorization. Preparation of this report on sedimentation in <br /> <br />John Martin Reservoi r on the Arkansas River in Colorado was authorized <br /> <br />by the District Engineer, Albuquerque District, Corps of Engineers, <br /> <br />Albuquerque, NelV ~lexico, in accordance with HI 1110-2-4000, dated <br /> <br />15 November 1961. <br /> <br />2. General. This is the fifth report presenting the results of <br /> <br />sediment investigations in John Martin Reservoir and for the Arkansas <br /> <br />River subbasin above Great Bend, Kansas. It was prepared following the <br /> <br />resurvey of sedimentation ranges in John Martin Reservoir and the degrada- <br /> <br />tion-ranges on the Arkansas River below the dam during ~larch 1972. Topog- <br /> <br />raphy of the area of the reservoir under water was detennined to elevation <br /> <br />3,800 feet- by use of sonic sounding equipment. Twenty-eight sounding lines <br /> <br />were run in the latter part of ~larch 1972 and a topographic map was drawn <br /> <br />from these data. This is the ninth resurvey of the reservoir ranges and <br /> <br />the seventh resurvey of the river ranges since the original surveys. The <br /> <br />last six resurveys have been made on an average of about once every 4-1/2 <br /> <br />years. Reports on sedimentation in John Martin Reservoir were published <br /> <br />in September 1953, JWle 1960, June 1965, and October 1967. These reports <br /> <br />are complete and contain all pertinent factual data and results of studies <br /> <br />conducted prior to those dates. This fifth report includes data and <br /> <br />results of investigations since the 1966 resurvey (fourth report) and a <br />