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<br />')'-36 <br />nO!..,J <br /> <br />· Exports of water from the lower basin to supply the city of Grand Junction were <br />estimated by city staff. These exports will be a 100% depletion from the basin. <br /> <br />Methodology for Mining, Snowmaking, BLM Stock ponds: <br /> <br />· The estimate of additional mining use was taken from: <br />· For the Upper Basin: The only identified increase is likely to come from the <br />Mount Emmons area near Crested Butte. A 1997 report by W.H. Wheeler <br />estimated 1,530 acre-feet of additional depletion. <br /> <br />· For the Middle Basin: awaiting info from the BLM/USFS EIS on future North <br />Fork coal mining development. <br /> <br />· The estimate of additional snowmaking is based on a master development plan for <br />Crested Butte's expansion to Snodgrass mountain. This document estimated an annual <br />21.3 at depletion. <br /> <br />· The estimate of BLM stock pond depletions was derived from 6 historical years (1995 _ <br />2000) of stock pond and spring development projects. The total new depletions reported <br />over those 6 years were used to develop an average annual value which were multiplied <br />by 50 years to arrive at a total figure of 400 acre-feet for the entire basin. This value was <br />equally distributed into the 3 sub-basin for purposes of this study. <br /> <br />Anticipated Refinements yet to be completed/or this study: <br /> <br />· In order to better estimate of the percent of county population in each sub-basin, analyze <br />the demographers information -on total county population vs uriJan areas; verify estimates <br />with appropriate county planners. . (See method in Helton & Williamsen report) <br /> <br />· Contact SEO for estimates of stock or other pond depletions. Determine if these and <br />BLM numbers really reflect new depletions or are just replaCing old ones, i.e., is the <br />livestock population growing creating additional stockwatering needs? <br /> <br />· Review the variation in amount of per capita use in various geographic areas to determine <br />whether area-specific values should be used. Obtain monthly distribution values from <br />other M&I water suppliers and for other categories of water use. <br /> <br />· Adjust population projections for seasonal fluctuations (e.g., use 25% in some locales- <br />number from East River area 201 studies). <br /> <br />Other possible refinements: <br />· Assume growth rates other the state demographers' numbers. <br /> <br />Page 5 <br />