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RGDSS Memorandum <br />Final <br />TO: Ray Bennett <br />FROM: Ed Armbruster, Hydrosphere <br />SUBJECT: RGDSS Surface Water, Task 7.2 -Aggregate Reservoirs and Stock Ponds <br />Not Explicitly Modeled in Phase 1a <br />DATE: March 13, 2000 <br />CC: Randy Seaholm <br />Introduction <br />This memorandum represents delivery associated with Task 7.2, Aggregate Reservoirs and Stock <br />Ponds Not Explicitly Modeled in Phase la.. The objective of this task is as follows: <br />Aggregate those storage structures not explicitly modeled in Phase 1 a model development. <br />Combine these structures into approximately 8 aggregation groups. Use information on <br />swing water rights to identify 8 water right classes to be used by aggregate reservoir <br />structures. <br />The determination of key storage structures to be represented in the Rio Grande Surface Water <br />model was accomplished during Phase la model development and is described in a memorandum <br />documenting Task 6.2 ("Finalixe Key Structures. Those structures not meeting the defining <br />criteria for key structures were considered during Task 7.2 for Phase lb model inclusion as <br />aggregated structures. This memo describes the process used to evaluate and group individual <br />storage structures into aggregates. <br />Aggregation Process <br />Reservoirs explicitly represented in the Phase la model (Task 6) included those with a capacity of <br />greater than 1,000 of and/or are regularly operated to provide water supply. The Phase la model <br />represents 12 reservoirs explicitly and includes numerous operating rules to represent current <br />operating practices by the reservoir owners. These 12 reservoirs represent approximately 350,817 <br />(90%) of the approximately 387,772 of of storage capacity in the Rio Grande Basin. <br />Those reservoirs (and stock ponds) not explicitly represented in Phase la were represented in <br />Phase lb by aggregating all storage rights into 10 aggregated reservoirs; two in Water Districts 20 <br />and 22 and one in each of the remaining six Water Districts. Two were required in Water Districts <br />20 and 22 to better reflect geographic locations of the storage facilities (discussed below). Only <br />absolute (as opposed to conditional) water rights were considered in the aggregation process. <br />Location of Aggregate Reservoirs in Network <br />The Data Management Interface watright was used to extract information on all net absolute <br />storage decrees in within Division 3, and information on the source streams for these water rights. <br />C:Acdss\Task7-2.doc Reservoir Aggregation March 13, 2000 -Page 1 of 5 <br />