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<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 /> <br />WATER RESOURCES OF TIlE REGION <br /> <br />East Slope <br /> <br /> <br />The main source of supply for the metropolitan area is the South <br /> <br /> <br />Platte River proper and Clear Creek. ~le major tributaries of the <br /> <br /> <br />South Platte River which are used by the water supply agencies from <br /> <br /> <br />North to South are the St. Vrain Creek, Boulder Creek, South Boulder <br /> <br /> <br />Creek, Coal Creek, Clear Creek and Bear Creek. ~le TImoff at key <br /> <br /> <br />gaging stations near the mountains and above major points of use, <br /> <br /> <br />except irrigation in South Park, reflects the flow of these streams <br /> <br /> <br />above the metropolitan area and approximates on the average 690,000 <br /> <br /> <br />acre-feet per year, not all of which is divertible. For comparison, <br /> <br /> <br />the average annual raw water requirements for the 1952-1957 period <br /> <br /> <br />increased to reflect the requirements of the present metropolitan <br /> <br /> <br />area population, amounts to about 220,000 acre-feet. <br /> <br />One of the major problems facing the metropolitan area is the <br /> <br /> <br />need for water during the winter because the present demands and <br /> <br /> <br />those anticipated in the future have or will exceed the actual stream <br /> <br /> <br />flow available at the points of diversion of the municipalities. <br /> <br /> <br />This is especially true on the South Platte River at the Waterton <br /> <br /> <br />gaging station which is below Denver's intakes. At this station <br /> <br /> <br />flows as low as 0.1 cfs have been recorded, and during January 1933 <br /> <br />13 <br />