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reported -the water provided by these structures is a supplemental supply to irrigated lands <br />associated with other structures on the river. Finally, District Water Commissioners were <br />contacted for clarification regarding the location and use of several ditches. The result of this <br />process was identifying approximately 320 ditches for inclusion in the model as aggregated <br />structures. The remaining 545 structures were determined to no longer be active. These <br />structures will not be represented in the Surface Water Model. <br />Attachment 1 is a complete listing of all direct flow diversion structures in Division 3 for each of <br />the eight water districts. Shown for each structures is its status as to whether it will be <br />represented as a key structure, within an aggregate group, or will not be modeled. <br />Location of Aggregate Diversion Structures in the Model Network <br />Aggregated direct flow diversion structures were generally located in the model network below <br />the lowest source stream serving a direct flow decree in each group. In most instances, the <br />aggregated structures were located on the primary stream within each general geographic area. <br />For example, direct flow water rights on numerous tributaries to the Rio Grande between South <br />Fork and Embargo Creek (including any aggregate structures on the Rio Grande within this <br />reach) were located on the Rio Grande at a point in the network just upstream of the Embargo <br />Creek confluence. This simplifying procedure is consistent with previous StateMod applications <br />in other river basins. <br />As previously noted there are 320 direct flow diversion structures aggregated in Division 3. The <br />distribution of these structures within each of the eight water district is shown in Table 1. Using <br />information on water supply source for each water right of these structures they were grouped <br />into 46 aggregated structures as shown in Table 2. More detailed information concerning specific <br />diversion structures aggregated under each group may be found in Attachment 2. <br />Table 1 <br />Aggregated Direct Flow Diversion Structures in Division 3 <br />District Number of <br />Aggregate Structures <br />20 111 <br />21 13 <br />22 6 <br />24 45 <br />25 55 <br />26 60 <br />27 13 <br />35 17 <br />Total 320 <br />Table 2 <br />Direct Diversion Structure Aggregations <br />StateMod <br />Aggregation Points <br />12 <br />4 <br />2 <br />10 <br />4 <br />2 <br />4 <br />46 <br />C:Acdss\Task7-l.doc Water Right Aggregation March 13, 2000 -Page 2 of 6 <br />