C150315 Feasibility Study - Laserfiche WebLink

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DRY YEAR YIELD ANALYSIS FOR SNOWMASS CREEK WATER SUPPLIES AND EVALUATION OF RAW WATER STORAGE REQUIREMENTS INTRODUCTION At the request of Snowmass Water and Sanitation District (District), W. W. Wheeler and Associates (Wheeler) has prepared this study to examine dry year water supply demand and yield of District water supplies. The District is situated in the Brush Creek drainage, and has water rights and diversion facilities located in both the Brush Creek drainage and the Snowmass Creek drainage. Refer to Figure 1 for the general location of the District and its major facilities. District water supplies are derived primarily from East Snowmass Creek due to impaired water quality and limited physical supplies in the Brush Creek drainage. A primary component of this study is the evaluation of the possible need for, and benefit of, raw water storage in meeting District water demands, minimizing diversions from Snowmass Creek during periods of low stream flow and maintaining municipal water service during a catastrophic event that renders District water supplies either undeliverable or untreatable. The objective of the study is to examine the probable yield of the District's water rights during two historical dry periods represented by the years 1977 and 2002 - 2003. The study will assess how additional raw water storage capacity will assist the District in meeting its future raw and treated water demands with anticipated growth of the District, and simultaneously meet a Stream Flow Stewardship Goal on Snowmass Creek. The approach to be used to assess the impact and benefit of raw water storage is to examine the impact of increased District demand and the Stream Flow Stewardship Goal on the volume of raw water storage required. The District has elected to implement a Stream Flow Stewardship Goal program on Snowmass Creek that will operate to minimize diversions from Snowmass Creek and Page 1