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<br />22G9 <br /> <br />The lands within the Project area have been irrigated since the 1860's. <br />However, the erratic nature of the unregulated Purgatoire River flow has not <br />been conducive to effective irrigation. As a result, the need for conservation <br />storage for irrigation was realized and incorporated into Trinidad Project. The <br />Project lands are located in the valley along the Purgatoire River and on <br />uplands north of the valley extending downstream about 25 mi les below the city <br />of Trinidad. <br /> <br />Except for limited storage in the off channel Model Reservoir, (owned by Model <br />Land and Irri gati on Company) wh i ch served 6,177 acres of the i rri gated area <br />prior to completion of the Project, no significant storage or regulation was <br />available for the flows of the Purgatoire River. The Model Reservoir had a <br />20,000 acre-foot storage decree, but a reservoir survey in 1946 indicated that <br />usable capacity had declined to only 6,200 acre-feet due to sediment deposition. <br />Except for this limited storage, the project area of about 19,700 acres was <br />served by direct flow diversions through 'eleven (11) different ditches. <br /> <br />The Bureau performed hydrologic and economic analyses of the irrigation function <br />of the Project. The results of this study was completed and presented in <br />Appendi x A Water Supp ly and Utili zat ion Report of April 1961, hereafter re- <br />ferred to as the "1961 Study". <br /> <br />The 1961 Study proposed that in order to accomp 1 i sh storage, regu 1 at ion, and <br />improvement of the water supply for the Project area the following conditions <br />would need to be met: <br /> <br />1. Transfer the 20,000 acre-foot storage decree of the <br />Model Reservoir from the present site to the proposed <br />Trinidad Reservoir. <br /> <br />2. Store in Trinidad Reservoir, in addition to storage <br />under the Model right (transferred Model storage right), any <br />flood flows originating on the Purgatoire River ftbove the <br />damsite which would be otherwise spill from John Martin <br />Reservoir. <br /> <br />3. Store in Trinidad Reservoir under Model rdJltt (maximum <br />rate of 700 cubic feet per second and 20, acre-foot <br />filling) winter (November through March) flows of the <br />Purgatoire River historically diverted for winter irriga- <br />tion of project lands which are in excess of flows <br />required to meet the lesser, of either the historical <br />diversions or the decreed rights of the Ninemile and <br />Highland Canals and 5 cubic feet per second passed through <br />the reservoir for livestock or 'domestic watering purposes. <br />Useable project computed returh flow was to be considered <br />available to meet the downstream rights. <br /> <br />4. Store in Trinidad Reservoir under the Model right <br />(maximum rate of 700 cubic feet per second and 20,000 <br />acre-feet of filling) summer (April through October) flows <br />of the Purgatoire River in excess of immediate require- <br />ments of the Project area and' flows requi red to meet the <br />lesser of either the historical diversions or decreed <br />rights of the Ninemile and Highland Canals. Useable <br /> <br />2 <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />