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313'7 . HYDROLOGY Contributing drainage area (above Trinidad gaging station) .................................. Runoff and time of occurrence: Average annual ~water years 1925-1957) Maximum annual water year 1942 ......;... Minimum annual water year 1951~ .......... REMARKS 795 s'l.mi. 62;lOO ac.-ft. 197,300 ac.-ft. i6,300 ac.-ft. In the development of the plans for constructing the Trinidad Project, the activities of the Bureau of Reclamation were confined to investi- gating the irrigation functions which consist of improving the water supply for 11 existing irrigation ditches. The irrigation investi- gations included studies of the irrigation water supply and utilization, classification of the project lands, and economic studies for estimating the payment capacity of the lands and the irrigation benefits. Other studies were confined to a survey of the existing irrigation facilities which revealed tbat their general condition is good and that they will be ade'luate for serving the project lands after minor improvements are made as provided for in the OM&R estimates used in the economic analysis. . In past operations, the irrigation water supplies for the area as a whole have been inade'luate and ill-distributed--the average annual 'luanti ty amounting to 61. 0 percent of the total re'luirement with late season supplies being consistently unavailable. Construction of the project and restricting deliveries to irrigable lands only will increase the annual average supply to 83.0 percent of the total re'luirement. The Purgatoire River Conservancy District has been organized for the purpose of contracting for repayment and for management of the project water supply. . vi '-