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Reservoir and Stockpond Evaporation <br />For the Consumptive Uses and Losses Summary, reservoir and Stockpond evaporation <br />was calculated based on the historic end-of--month contents, area/capacity curves, and <br />monthly evaporation rates used in the RGDSS historic StateMod modeling effort. <br />1. Data Collection <br />The data necessary for determining reservoir evaporation include: <br />• reservoir end-of--month contents <br />• reservoir area/capacity information <br />• evaporation rates <br />Reservoir and Stockpond evaporation was estimated from information used in the historic <br />application of StateMod for the Rio Grande basin. In general, reservoirs with greater <br />than 1,000 acre-feet capacity were modeled explicitly. The smaller reservoir and <br />stockponds were aggregated by water district to account for permitted storage in the <br />basin. This process was described in the memorandum RGDSS Surface Water, Task 7.2 <br />A~~re~ate Reservoirs/Stock Ponds Not Explicitly Modeled, Hydrosphere, August 1999. <br />Historic end-of--month content records were obtained from the StateMod modeling effort <br />(rgTW.eom). For aggregate reservoirs and explicit reservoirs without end-of--month <br />contents, end-of--month contents were set to capacities in rgTW.eom. Area/capacity <br />curves and monthly evaporation rates were obtained from the StateMod modeling effort <br />(rgTW.res and rg.eva). The creation of these files was described in the Hydrosphere <br />memorandum RGDSS Surface Water, Task 6.8 Prepare Reservoir Files, September 1999. <br />Aggregate reservoirs were estimated to be 10-feet deep to determine an associated <br />surface area. <br />Table 5 lists the modeled reservoirs by county for the Rio Grande basin. Note, ID's such <br />as 20ARW01 describe the first (O1) aggregate reservoir (ARW) in water district 20 (20). <br />C:\Documents and Settings\ckf.DWR\My Documents\AppendA_culoss.doc Septemb~62o'~ ~OQ9 <br />