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<br />. <br /> <br />. <br /> <br />. <br /> <br />n~~7Jb <br /> <br />made (if the same procedures are followed that were used in the <br />Upper Basin) where and how much to distribute any negative errors <br />that are present. If the decision is made to not change the <br />Gunnison at Crystal and at Grand Junction (make them both Base <br />Stations), then possibly too mucn error will have to be <br />distributed amoung North Fork, Uncompahgre, and Smith Fork. <br /> <br />Updating and Revising the CRSS Stations - The Gunnison River at <br />Crystal Dam and the Gunnison River at Grand Junction are two <br />stations used by CRSS. These two stations will undoubtedly be <br />used to mass balance the Lower Gunnison Basin virgin flows. They <br />will have to be updated to 1990 and maybe they should be refined <br />by adding reservoirs and transbasin diversions etc. (Ridgeway, <br />Crawford, Gould, and Overland Reservoirs; Leopard Creek and Red <br />Mountain Ditch Transbasin Diversions to name a few) that are at <br />present not in the operation study that computes virgin flow at <br />these two stations. This work should be short and simple and <br />snould be coordinated with the personnel involved with CRSS since <br />they are now in the process of updating their data base. <br /> <br />Setting Priorities - There seems to be almost no end to the <br />number of things which can be done to compute, revise, update, <br />and refine virgin flow estimates in the Gunnison Basin. Some of <br />these are mentioned above. Therefore, it will probably be <br />important to set priorities and do the most important things <br />first. Probably the most important item will be to develOp <br />estimated virgin flows for the Lower Gunnison Basin. However, <br />before this task is undertaken, it may be well to decide on what <br />changes and refinements are going to be made so that the virgin <br />flows for the Lower Basin will not have to be redone later. <br /> <br />GENERAL REVIEW OF UPPER GUNNISON BASIN PHASE I <br /> <br />Mass Balance Procedure - When virgin flows were computed for the <br />Upper Gunnison Basin, difference files were developed which <br />represented flows for intervening areas between core station <br />points. Whenever these difference files showed negative values, <br />only the upstream stations were adjusted (reduced) so that the <br />difference file values became zero instead of having a negative <br />value (is this correct?). It appears that this procedure <br />produced a fairly conservative set of virgin flows. <br /> <br />This procedure could have been done diffe:.=ntly. Flow estimates <br />could have been done for the intervening areas before the <br />difference files were computed. These difference files then <br />would become merely error files. The positive as well as the <br />negative errors could be distributed on a weighted basis to all <br />streams involved in the mass balance--to the previously called <br />Base Station as well as to the upstream stations. Tne result <br />would be a set of more neutral and less conservative virgin flows <br />that would balance perfectly. This procedure of mass balances <br />could be computerized (computerization might take longer than <br />