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26 <br />Current (1975) Supplies (Task 2 of Component one, Step 02A.) <br />Volumetric estimates of the hydrological yield (annual values <br />with monthly coefficients) will be made for (1) both current (1975) <br />storage /operational conditions and "virgin" conditions, (2) a range <br />of both high and low flow probabilities of occurrence, and (3) pre - <br />specified geographic units. The total hydrological yield includes <br />both surface and groundwater yield information in a manner that avoids <br />double accounting of available supplies, and yet accounts for areas <br />where groundwater depletion is occurring that does not directly affect <br />surface supplies. <br />Comparison of Requirements and Supplies (Task 3 of Component one, <br />Step 02A) <br />This task involves numerically comparing, for each geographic <br />unit (ASA), the volumetric estimates of 1975 supplies developed in task <br />2 with the future condition requirements developed in task 1 for 1975, 1980, <br />1990, 2'000, a -ad 2020. <br />Examples of volumetric information, annual and monthly, that <br />may be displayed for use in helping describe the magnitude of the def- <br />iciencies or surpluses are the following: <br />o Total withdrawal requirements <br />o Total consumptive requirements <br />o Total import and export requirements <br />o Total amount released downstream <br />o Total 1975 supply <br />o Total deficiency or surplus <br />o Name of month with largest deficiency or <br />smallest surplus <br />o Ratio of deficiencies or surpluses to the <br />sum of consumptive, export, and down - <br />stream - release requirements <br />