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<br />plan for the control of floods and the development of the water <br />resources of the entire Arkansas River basin. The reservoir provides <br />ZlO,375 acre-feet of storage capacity for nood control. It protects the <br />fertile Arkansas River Valley below the dam from noods originating in <br />the 18,915 square miles of the Arkansas River basin above the dam. It <br />provides 350,951 acre-feet of storage space for conservation and <br />recreation. John Martin Reservoir supplies water to the irrigated lands <br />betow the dam as far as Garden City, Kansas. The top of the con- <br />servation pool is 3,851 feet above mean sea level. which provides <br />350,951 acre-feet of storage for irrigation. The release of stored flood <br />waters in excess of the conservation and recreal10n pools and aoove <br />elevation 3,851 feet is planned so that, when combined with flows <br />originating downstream from the dam, the capacity of the charmel will <br />not be exceeded. Upon request of the Arkansas River Compact <br />Administration, irrigation water for downstream water users is <br />released through the outlet works in the base of the dam. Downstream <br />flood damages prevented by John Martin Dam already exceed the cost <br />of the project. Benefits have atready passed the $92 million mark. <br />Recreation and favorable fish and wildlife habitats are derived from <br />this project. With reservoir lands open to all. there are many attractive <br />public use areas for outdoor recreation, water sports, fishmg and <br />boating, or just relaxed living. During construction some embankment <br />material was obtained from a 75-acre tract of !clOd immediateJ\' <br />downstream of the dam. This excavated area. averaging 12 feet deep, <br />filled with water and formed Lake Hasty, the center of year-round <br />recreation. <br />John Martin Dam consists of a concrete gravity structure 1,644 feet <br />long and 120 feet high, and an earthfitl structure 2,600 feet long. The <br />concrete gravity structure contains a gated spillway provided with <br />sixteen 30 feet by 64 feet tainter gates with their operating machinery. <br />There are earthen wing dams on either side o{ the main darn. The <br />north wing dam is 3,880 feet long, cormecting to the earthfill structure <br />of the main dam at the north abutment. The south wing dam lS 5.807 <br />feet long and connects to the south end o{ the concrete structure of the <br />main dam. A bituminous-surfaced roadway, 21 feet wide. extends along <br />the crest of the north wing dam, main dam. and south wing darn The <br />overall length of the structure is 2.6 miles. Detailed project data are <br />shown below. <br />DAM <br />Total length , feet. <br />Maximwn height above streambed, feet <br />Width of roadway on dam, feet. <br /> <br />13.945 <br />118 <br />21 <br /> <br />SPILLWAY <br />Total length, including piers, feet <br />Crest gates, 30' x 64' . <br />Discharge capacity, cubic (eet per second. <br /> <br />1.1i4 <br />16 <br />639,200 <br /> <br />OUTLET WORKS <br />Sluicing conduits, 6' x 7%' . <br />Regulating condulls, 4' x 4' . <br /> <br />4 <br />2 <br /> <br />RESERVOIR <br />Capacity, acre-feet. <br />Ftood control storage, acre-feet. <br /> <br />..621.326 <br />.270.375 <br /> <br />-7- <br />