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WSPC12546
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Last modified
1/26/2010 4:16:47 PM
Creation date
8/2/2007 3:02:46 PM
Metadata
Fields
Template:
Water Supply Protection
File Number
8220.102.01.K
Description
CO River Basin Water Projects - Aspinall Unit - General - Section 7 Consultation-Biological Opinion
State
CO
Basin
Colorado Mainstem
Water Division
5
Date
4/1/2001
Author
DOI-BOR
Title
Gunnison Basin Water Demand Study - Draft - Estimate of New Depletions for the Period 2000-2050 - Draft - RE-Gunnison PBO and Related Issues - 04-01-01
Water Supply Pro - Doc Type
Report/Study
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<br />001147 <br /> <br />· Exports of water from the lower basin to supply the city of Grand Junction were <br />es~mated 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 snow making is based on a master development plan for <br />Crested Butte's expansion to Snodgrass mountain. This document estimated an annual <br />21.3 af depletion. <br /> <br />· The estimate ofBLM 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 completedfor this study: <br /> <br />· ill order to better estimate of the percent of county population in each sub-basin, analyze <br />the demographers information on total county population vs urban 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. Detennine if these and <br />BLM numbers really reflect new depletions or are just replacing old ones, Le., 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 detennine <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 />
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