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Attachment x, is an accounting of the ISA accounts used for 1998 and is representative of the <br />ditches that have historically participated. <br />Also in 1990, the CWCD applied for and was granted the right to store water in Platoro Reservoir <br />via exchange from it's share of the yield of the Closed Basin Project and its share of measured <br />flows from the Norton Drain (see Case No. 90CW047). The Norton Drain exchange allows the <br />CWCD to exchange fifty percent of the flows measured at the "upper gage" on the Drain. The <br />Closed Basin exchange allows the CWCD to store its share of the priority one water yield of the <br />Closed Basin Project. The decree issued in 90CW047 is provided as Attachment 3 to this <br />memorandum. <br />Platoro Reservoir has several active water storage accounts. Included is water stored under the <br />Reservoir's own 1975 decree (project water), water stored under direct flow rights, a 3,000 acre- <br />foot conservation pool, and a flood control pool which varies in size over the runoff period. As <br />discussed above, water may also be stored in Platoro via the Closed Basin and/or the Norton <br />Drain exchange. Additional information concerning operation of Platoro Reservoir and water <br />storage accounting can be found in the RGDSS memorandum documenting discussions with the <br />Conejos Water Conservancy District. <br />House Resolution 429 mandated winter (October through April) flow target of 7 cfs below <br />Platoro Reservoir. This target is met by inflows or releases out of the Reservoir from the <br />CWCD's "general" pool If the CWCD's general pool is empty, the target is met using water <br />from the conservation pool providing that the reservoir has at lease 2,400 acre-feet in total <br />storage. HR 429 also specifies a summer release of 40 cfs or the inflow to the reservoir, <br />whichever is less. <br />The roles of the Water Commissioners with respect to operations of Platoro Reservoir is generally <br />limited to 1) ensuring inflows are passed when out of priority or for Compact purposes, 2) <br />approving storage under different storage decrees; and 3) oversight of the ISA program. <br />Trans-Mountain Diversions <br />There are no trans-mountain delivery or release points within District 22 <br />Day to Day Water Rights Administration <br />Water rights administration occurs by way of frequent and detailed communication between the <br />two District 22 Commissioners, the Division 3 Engineer (Steve Vandiver) and his staff, the <br />CWCD, and the many ditch owners in the District. Commissioners work closely with ditch <br />owners to inform them of flow conditions, curtailment requirements, calling water right priorities, <br />and their own individual entitlements. The Commissioners actively work to control and adjust <br />several of the ditch headgates, and simply request adjustments by owners of other structures. The <br />required frequency to adjust headgate structures (diversion flow rate) is a function of the <br />variability of instream flow conditions and the needs of the water users. A sample "call sheet" for <br />District 22 is provided as Attachment 6. <br />The necessity for Commissioners to actively administer water rights, i.e. visit and adjust diversion <br />structures is highly dependent on changes in flow conditions. The Commissioners face additional <br />challenges in their administration because of the different hydrologic patterns between the <br />Conejos, Rio San Antonio and the Rio Los Pinos. Whereas the Conejos tends to peak during the <br />early part of June, peak runoff on the Rio San Antonio and Rio Los Pinos typically occurs <br />C:Acdss\D22_Mem.doc District 22 Interview July 2, 1999 -Page 6 of 9 <br />