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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 I <br />I <br /> <br />shown on Figure 11-3. Almost all of the mainstem water rights from the Rio Grande <br /> <br /> <br />headwaters to the stateline are in District 20. Of the mainstem water rights from <br /> <br /> <br />the confluence with the South Fork to the stateline, all but one are in District <br /> <br /> <br />20. The listing of approximately 310 mainstem water rights in District 20 (prepared <br /> <br /> <br />by the water administrators) has been included as Appendix A. <br /> <br />Since water districts other than District 20 lack major mainstem water rights which <br /> <br /> <br />would significantly affect water availability at the potential reservoir sites, <br /> <br /> <br />investigations of water administration in these districts were not considered. <br /> <br />Interviews were conducted with Steve Vandiver, the Division 3 Engineer, and Max <br /> <br /> <br />Nash, the District 20 Water Commissioner, to learn about water administration which <br /> <br /> <br />would affect water availability to a new reservoir. The steps performed in <br /> <br /> <br />allocating water in District 20 are summarized below. <br /> <br />1. <br /> <br />Based on runoff forecasts issued prior to the runoff seaSOD, the Division <br /> <br /> <br />Engineer estimates the portion of the Rio Grande flows at Del Norte which <br /> <br /> <br />are required to satisfy the Rio Grande Compact and provides the Water District <br /> <br /> <br />20 Commissioner with a "curtailment percentage" of Del Norte flows which have <br /> <br />to be passed during the irrigation season to satisfy Compact obligations. <br /> <br /> <br />See Section IV for more detailed discussion of the factors involved in this <br /> <br /> <br />determination. <br /> <br />2. <br /> <br />In determining the Del Norte flows available for allocation, the water <br /> <br /> <br />commissioner first subtracts the transmountain diversions and reservoir <br /> <br /> <br />releases from the measured Del Norte flow. The transmountain diversions and <br /> <br /> <br />reservoir releases are not available for general allocation since they are <br /> <br /> <br />designated for particular diversion systems. <br /> <br />3. <br /> <br />The water commissioner then determines the water available for allocation <br /> <br /> <br />when considering the Compact. To do this the flow calculated in 2. (adjusted <br /> <br /> <br />flow) is multiplied by the curtailment percentage and the result is calculated <br /> <br /> <br />flow. This water is then made available to Colorado water users by proceeding <br /> <br /> <br />down a list of decreed water rights ranked by priority (Appendix A) and <br /> <br />25 <br />