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streamflows for the Jelm gage were pulled from the USGS web site <br />(http://nwis.waterdata.usgs.~ov/nwis/discharge/?site no=06658500). <br />• Exports <br />There are no exports from the South Platte River basin. Average annual exports from the North <br />Platte River and Laramie River basins were identified in SPDSS Task 4. The Task 4 values <br />include all transmountain exports available in the HydroBase database over the 1950-2002 <br />period. <br />• Ground Water Ou~ows <br />Ground water outflows from the South Platte River alluvial aquifer are difficult to determine. <br />The initial estimate of this water budget component was estimated from information available in <br />the Bittinger et al., Hurr et al., and CWRRI CR190 studies (15 kaf/yr, on average). Initial <br />estimates of ground water outflows from the North Platte River and Laramie River basins were <br />estimated to be zero based on conversations with the Water Commissioners and Division <br />Engineers in those basins. <br />Changes in Storage <br />Initial estimates of zero change in surface water storage and ground water storage were used in <br />the water budgets. This is considered appropriate prior to further developments for the SPDSS <br />effort, which will include the modeling of the complex ground water/surface water interactions <br />within the SPDSS study area. The gathering and development of the data necessary to develop a <br />ground water model of the South Platte River basin is anticipated to provide a better, and more <br />detailed estimate of ground water outflows from the basin than were available from the reviewed <br />studies. <br />These water budget components, excluding the native vegetation CU component were input to <br />the StateWB model for the three river basin water budget runs. The initial water budgets were <br />run to estimate the native vegetation CU based on other recorded or estimated input data. The <br />inputs to the SPDSS water budget runs and the data extracted from the studies reviewed in Task <br />82 are summarized in Table 1. The water budget results are also included in Table 1. The water <br />budget components are graphically represented in Figures 2, 3, and 4, located at end of the <br />memorandum. <br />Task83 final.doc 6 of 15 Apri17, 2005 <br />