C150315 Feasibility Study - Laserfiche WebLink

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GENERAL ASSUMPTIONS AND OPERATIONAL COMPONENTS The following general assumptions and operational components apply to all of the modeled scenarios. The general assumptions and operational components are described below for each model module they are input into. SUPPLY SIDE MODULE The Supply Side Module has two major components: 1) stream flow records (Snowmass Creek and tributary inflow), and 2) water rights diversion information (stream diversion and in-stream flow rights). Snowmass Creek Virgin Flow Hydrograph. The Snowmass Creek virgin flow hydrographs used in the Supply Side Module for the 1977 and 2002 - 2003 periods were estimated using two distinctly different methodologies. The 1977 flows were synthesized as a percentage of near by Maroon Creek flow records for the 1977 period, and the 2002 - 2003 flow records were based on actual flow records and correlations for missing data. Baseline virgin flows were determined for Snowmass Creek at the District's Snowmass Creek Pump station. The 1977 synthetic flows on Snowmass Creek were based on the flow in Maroon Creek correlated to Snowmass Creek using a ratio of synthetic flows for both Snowmass and Maroon Creeks. The ratio was based on estimated monthly flows on both Snowmass and Maroon Creeks, found using the methodology presented in Water Resources Investigation Report 85-4086. The District provided stream flow records measured at the Snowmass Creek pumping station for the 2002 to 2003 study period. The records provided contained "gaps" and also periods known to be inaccurate. To fill in the gaps and adjust the records for periods known to be inaccurate, monthly factors were determined to correlate flows recorded on the Roaring Fork above Aspen (corrected for major diversions) and those measured as bypassing the District's Snowmass Creek Pump Station. The monthly correlation factors were based on periods believed to have accurate records at Page 5