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<br />~ 0824 <br /> <br />IV. DESIGN BASIS AND CRITERIA <br /> <br />',A. WATER REQUIREMENTS AND EMERGENCY RESERVOIR SIZING <br /> <br />1. Water Usage <br /> <br />The design basis for the conceptual integrated water system <br />changed during the course of the study as a result of a TRW <br />review of the NOSR-1 water requirements. The maximum amount <br />of water required on NOSR-1 to produce a total of 200,000 <br />bb1/d was formerly estimated to be 65,000 acre-ft/yr. This <br />amount was established by Lurgi retort technology as it was <br />understood in 1979. It then represented the largest known <br />water-consuming oil shale retorting technology. <br /> <br />The maximum expected water usage for 200,000 bbl/d of- pro- <br /> <br />duction was revised downward to 48,350 acre-ft/yr by the TRW <br /> <br />evaluation conducted in May 1981 (Reference No.2). The <br /> <br />revised usage is now based upon the Union B and the Superior <br /> <br />Circular Grate retorting technologies which use 5.7 and 5.5 <br /> <br /> <br />barrels of water per barrel of oil produced, respectively. <br /> <br />New data supplied by Lurgi revised their water usage down- <br /> <br />ward to 4.1.. The surge reservoir capacity was correspond- <br /> <br />ingly reduced from 3,750 acre-ft to 2,800 acre-ft. <br /> <br />2. Emergency Requirements <br /> <br />The required emergency reservoir size is based upon the <br />effect of water rights on water availability. It has been <br />shown historically that during dry years, four months is the <br />maximum possible number of continuous months during which <br />water may not be withdrawn from the Colorado River for <br />NOSR-1 use (Reference No.3). This assumes Colorado water <br />junior rights for NOSR-l are dated 1980. Therefore, any <br /> <br />IV-1 <br />