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<br />onn {i <br /> <br /> <br />. <br /> <br />COST QUOTA (1957-1990) <br /> <br /> <br />100 <br />90 <br />80 <br />70 <br />60 <br />50 <br />40 <br />30 <br />20 <br />10 <br /> <br />e torecaSlIng method includes a <br />consideration 01 potential water <br />demands In order to determine the <br />supplemental needs of District water <br />users. <br /> <br />How well the PrOject can meet these <br />needs depends on the followmg <br />information: <br /> <br />. the amount of water in C-BT <br />reservoirs <br />. the projected spring runoff <br />. the physical capability of the <br />system to deliver water <br />. soil moisture conditions <br />. estimated water needs for <br />future dry years <br /> <br />The amount of water in storage and <br />where It 1$ located (west slope - east <br />slope) helps determine how much IS <br />available at CoST delivery POints. <br />Forecastmg Inflows to the system has <br />always been at best a risky <br />proposition. but with each paSSing <br />. year. as the information base 1$ <br />increased. these lorecasts become a <br /> <br />little more accurate, By determinIng <br />the mOisture content of exisllng <br />snowpack the Board can estimate <br />hOw much water will be captured In <br />west slope storage reservOirs. <br /> <br />The phYSical capability 01 the system <br />to deliver water must be considered <br />as well. The main link between the <br />west slope storage system and the <br />east slope delivery system is the <br />Adams Tunnel. This tunnel has a <br />carrying capacIty of 550 cubic feet <br />per second (cIs) or 1 tOO af per day <br />When operating at full throttle. the <br />C~BT can transport approximately <br />30.000 af each month to the east <br />slope or a lit1le more than 200.000 af <br />during the 7-month delivery season. <br />Thus. east slope storage IS essential <br />to the delivery system. Without <br />Horsetooth ReservOir and Carter <br />Lake. delivery of the full 310.000 af <br />capacIty would be Impossible. <br /> <br />Soil mOIsture conditions also playa <br />role In the Board's decision. Good <br /> <br />soil moisture conditions will lessen <br />the early call for water during the <br />germination period for crops. On the <br />other hand, low soil moisture <br />conditions increase the farmers' need <br />for additional supplemental water. <br /> <br />Last, and probably most important. is <br />the Board's deep-seated belief that <br />the project should maintain as much <br />water in storage as pOSSible for <br />subsequent low water years. This <br />consideration lempers the desires of <br />those who would like water users to <br />have the maximum Quota every year. <br />If the Board sets a high quota and the <br />runoff and precipitation are above <br />normal. nothing is accomplished <br />except perhaps encouraging the <br />overuse of water Simply because it is <br />available. The Board believes <br />strongly that the C-BT Project must <br />be used like a savings account which <br />must not be drawn down to very low <br />levels except in times of extreme <br />emergency. <br /> <br />Contmued on page 11 <br /> <br />WATERNEWS SUM',lER 1990 <br /> <br />5 <br />