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<br />~:.;) <br /> <br />N <br />Q!) <br />""'" <br /> <br />~ produce only about 500 acre- feet of sediment annually and that less than <br /> <br />25 percent of the 500 acre-feet reaches John Hartin Reservoir. The <br /> <br />principal tributaries on the north si,le of the river that produce sizeable <br /> <br />quantities of sediment arc l'ountain and Chico Creeks near Pueblo, rolorado, <br /> <br />which contribute about 1,200 acre-feet annually to the main stern. The <br /> <br />watershed from the south het\ieen Pueblo and John Hartin Dam yields ahout <br /> <br />6,000_acre-feet of sediment annually to the main stern. The principal <br /> <br />serliment-proclucing streams from the south are lIuerfano. ^pishapa, and <br /> <br />Purp,atoi re Ri vers. The sediment computed to reach .John nartin Reservoir <br /> <br />during the period October 1942 through "larch 1972 was Rl,756 acre-feet. <br /> <br />Of this amount, about 58 percent was contrihuted by the Purgatoire River <br /> <br />which enters the reservoir below Las ^nimas, Colorado. <br />, <br /> <br />8. TIle geology, soils, climate, precipitation, and meteorological <br /> <br />influences were presented in detail in the 1960 report. <br /> <br />JOliN ~l^RTIN RESERVOIR PROJECf <br /> <br />9. Project description. John Martin Dam is on the Arkansas River <br /> <br />ill Bent County, Coloraelo, between the towns of Las ^nimas and Lamar, as <br /> <br />shown on plate 1. It is a multinle-purpose project constructed for flood <br /> <br />control and irrigation. Pertinent data for some of the features of the <br /> <br />project are presented in table 1. <br /> <br />10. Design operation. John ~fartin Reservoir is designed to operate <br /> <br />as a multiple-purpose project with storage allocated to flood control and <br /> <br />conservation of irrigation water. Storage was not provided for recreational <br /> <br />4 <br />