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WSP08177
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Last modified
1/26/2010 2:30:26 PM
Creation date
10/12/2006 2:47:29 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8240.200.40.J
Description
Yampa
State
CO
Basin
Yampa/White
Water Division
6
Date
5/1/1997
Title
Findings of the Sediment Monitoring Program Peer Review Panel and Recommended Work Plan
Water Supply Pro - Doc Type
Publication
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<br />Explicitly includes all water diversions and return flows <br /> <br />Driven by available records <br /> <br />In this analyses operated with three levels of demand: <br />Existing (calibrates model to gage records) <br />Baseline (includes diversion capability with existing facilities) <br /> <br />Near Term Future Demand Levels (25 years out) <br />(includes some diversions contemplated in the Baseline <br />analysis, future growth increments per BBe) <br /> <br />Long Term Demand Levels (50 years out) <br />(includes some diversions contemplated in the Baseline <br />analysis, future growth increments per BBe) <br /> <br />Reported montWy average values are in cubic feet per second <br /> <br />Target flows for CRDSS modeling need to reflect desired monthly <br />average values. Recognizing that day to day flow variation has <br />occurred historically (both per and post human influence) such <br />variability should be included in any consideration of the flow regime. <br />As a monthly average flow target input into CRDSS may be exceeded <br />just as much as it is not met the flows during the months of August, <br />September and October should be considered in comparison to a <br />management target that is higher than the desired minimum flow. To <br />reflect this in the review of the CRDSS data consider the following: <br /> <br />Modde, et al have recommended a flow target of 93 cfs. <br /> <br />In 31 of the 64 years of record this flow has not been met for <br />the entire study period. <br /> <br />In 17 of the 64 years this flow has not been met for at least 14 <br />consecutive days. <br /> <br />The study conditions are "drought" or extreme low flow <br />conditions. To provide a modeling target that will assure <br />compliance with the minimum flow recommendation use the <br />93 cfs plus 1/2 a standard deviation of the daily variability <br />within the lower 20 percentile month (by volume) of the study <br />months. This results in modeling targets of: <br /> <br />August 93 + 1/2(66) = 126 cfs <br />September 93 + 1/2(44) = 115 cfs <br />October 93 + 1/2(44) = 115 cfs <br /> <br />Theoretically if the data is normally distributed (not), use of a <br />
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