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<br />002~54 <br /> <br />TABLE 1 (continued) <br />PROCEDURE TO ESTIMATE DEPLETIONS AND DIVERSIONS <br /> <br />Code Structure Tvoe of Use Procedure used to Estimate Diversions and Deoletions <br />(1 (21 (31 (4) <br />Ev Reservoir Reservoir evaporation Diversions and depletions equal to reservoir evaporation losses, (Note: If <br /> with rights in is primary use measured diversions are available, the measured diversions are reported - See <br /> units of ac-ft Dv1 code.) Reservoir evaporation loss estimated as 5.6% of the reservoir <br /> storage right The factor of 5,6% was determined from an analysis of 24 <br /> reservoirs with available reservoir surface area. For these reservoir the total <br /> reservoir evaporation losses were estimated as the reservoir surface area <br /> multiplied by the reservoir evaporation rate. This loss is then pro-rated between <br /> water rights using the decreed storage amounts, The reseNoir sui1ace area is <br /> obtained from the DWR GIS information (COSS website) that tabulates <br /> maximum water surface area. A net evaporation rate of 2.23 feet is estimated <br /> from the average of the net evaporation rates at Taylor Park Reservoir and Blue <br /> Mesa ReseNoir (see the Division 4 Engineer Accounting for Taylor Park <br /> Reservoir and Blue Mesa Reservoir). <br />1,1 Non- Irrigation with no Depletions and diversions are zero because this structure was determined to <br /> Reservoirs irrigated acreage and have no irrigated acreage by the DWR as dOaJmented in the DWR irrigated <br /> no DWR diversion acreage data in the DWR HYDROBASE. In addition. the DWR HYDROBASE <br /> records showed zero ac-ft of diversion far this structure, <br />1,2 Non- Irrigation with na Diversion records from DWR HYDROBASE. The DWR estimated na irrigated <br /> Reservoirs irrigated acreage but acreage associated with structure. Depletions are estimated to be 16% of the <br /> DWR diversions diversions based on the depletions percentage for junior irrigation rights in <br /> records SlaleCU (0.18=2,732/15.553\. <br />1,3 ReservOIrs Irrigation with DWR Records of diversion to storage. release from storage, and evaporation losses <br /> records available from the DWR HYDROBASE, These records indicate that in 2001, alt <br /> of the diversions to storage were under water rights senior to the Aspinall unit <br /> water rights. This coding is used for Vouga Reservoir, Upper McDonough <br /> Reservoir, and lower McDonouah Reservoir, <br />1,4 Reservoirs Imgation with no No records of diversion, release or storage available from the DWR <br /> DWR records HYDROBASE. Based on engineering judgment it is estimated that 50% of the <br /> water right was diverted into storage and 30% of the water diverted to storage <br /> was consumed for irrication ourooses. <br />Ir5 Reservoirs Decreed for Irrigation This code applies to Spring Creek Reservoir. This reservoir is decreed for <br /> but no longer used for irrigation but is no longer used for irrigation purposes. Therefore, the irrigation <br /> Irrigation diversions and depletions are zero ae-ft. <br />LGr Res.ervo\r Lake Grant ReseNoir Applies only to Lake Grant Reservoir (Strudure Id 593684). DWR recorded <br /> diversions equal to 133 ac-ft at this structure. These diversions are used to <br /> irrigate a golf course. The diversions are recorded at this strudure but <br /> diversions are not made under the lake Grant storage right. Therefore, only <br /> . diversions and deDletions from reservoir evaooration are shown. <br />Meek Ditch Transbasin Applies only to Meek Diversion Tunnel (Structure Id 400576). Diverts water out <br /> of Crystal creek into the Smith Fork Basin, AU of the diversions are exported out <br /> of the Aspinall Un~ drainage area; therefore, 100% of the diversions are <br /> considered consumed, <br />Mn Wells Municipal Diversions records reported in the DVVR HYDROBASE. For the purposes of <br /> this study ~ is estimated that depletions are 36% of diversions (value used by <br /> StateCUI. <br />Ot Non- Other Diversions and depletions are estimated at 0.44 ac-ft which is the value <br /> ReseNoirs estimated by the Division 4 Engineer for other water rights when no additional <br /> information is available, <br />Sn Pipeline Snowmaking Applies only to Crested Butte Mountain Resort (CBMR) snowmakmg water right <br /> (Strudure Id 591362). Diversions of 218 ac-tt from CBMR records, Depletions <br /> estimated to be 20% based on other water right transfers involving snowmak.ing <br /> water riQhts. <br /> <br />HeltOll & Williamsen, P C <br /> <br />PageS <br /> <br />ZOOl Annual Report.xls, Table 1, 12/1812002. rlh <br />