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Letter to Jennifer Gimbel October 21 2009
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Letter to Jennifer Gimbel October 21 2009
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10/5/2012 2:32:29 PM
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Water Supply Protection
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Letter to Jennifer Gimbel October 21 2009
State
CO
Date
10/21/2009
Author
Hunsaker, David
Title
Letter to Jennifer Gimbel October 21 2009
Water Supply Pro - Doc Type
Correspondence
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Provisional Flow Guides <br />Table 1 <br />Summary of Provisional Flow Guides <br />(average streamflow (cfs) at the Kremmling, CO streamgage) <br />Notes: <br />Dry year flow guides are based upon Grand County Stream Management Plan ( GCSMP) critical flows. <br />Average year flow guides are based upon current data that includes a combination of GCSMP fish flows and acceptable levels of floatboating flows. <br />Wet year flow guides are based upon current data that includes preferred recreation boating flows and historical hydrology. <br />Wet year flow guides also include flushing flows recommended in the GCSMP (1800 cfs for 3 days, 1 in every 2 years). <br />Provisional Water Quality Guides <br />Provisional Temperature Guides <br />Other Provisional Guides? <br />b. Basis for Provisional Flow Guides <br />Provisional Flow Guides are established by the type of hydrologic year: <br />dry, average or wet (see Figure 2). Initial prediction of a given hydrologic <br />year _ ,. `_ and will be based on the April to July "Most <br />Probable" forecast of streamflows from the Colorado Basin River Forecast <br />Center for the Kremmling gage. In early summer;:,-;,. <br />the initial prediction will be adjusted based on <br />actual flows at Kremmling. That adjustment may result in re- defining the <br />type of hydrologic year and thus the management approach. <br />The prediction of type of hydrologic year is used to define whether a wet, <br />average or dry hydrologic year is in progress in a given year, and the <br />appropriate management considerations to put into play. For example, <br />dry year management may be focused on protecting the survival of fish <br />rather than focusing on an optimal recreational boating experience; <br />Page 6 of 16 <br />Oct <br />I Nov <br />Dec <br />Jan <br />Feb <br />Mar <br />Apr <br />May <br />Jun <br />Jul <br />Aug <br />Sep <br />Dry Years <br />400 <br />400 <br />400 <br />400 <br />400 <br />400 <br />600 <br />600 <br />600 <br />600 <br />600 <br />600 <br />Average Years <br />600 <br />600 <br />550 <br />500 <br />500 <br />600 <br />800 <br />1,350 <br />1,350 <br />1,100 <br />950 <br />900 <br />Wet Years <br />700 <br />700 <br />700 <br />700 <br />700 <br />900 <br />1,600 <br />3,500 <br />4,500 <br />2,800 <br />1,500 <br />900 <br />Notes: <br />Dry year flow guides are based upon Grand County Stream Management Plan ( GCSMP) critical flows. <br />Average year flow guides are based upon current data that includes a combination of GCSMP fish flows and acceptable levels of floatboating flows. <br />Wet year flow guides are based upon current data that includes preferred recreation boating flows and historical hydrology. <br />Wet year flow guides also include flushing flows recommended in the GCSMP (1800 cfs for 3 days, 1 in every 2 years). <br />Provisional Water Quality Guides <br />Provisional Temperature Guides <br />Other Provisional Guides? <br />b. Basis for Provisional Flow Guides <br />Provisional Flow Guides are established by the type of hydrologic year: <br />dry, average or wet (see Figure 2). Initial prediction of a given hydrologic <br />year _ ,. `_ and will be based on the April to July "Most <br />Probable" forecast of streamflows from the Colorado Basin River Forecast <br />Center for the Kremmling gage. In early summer;:,-;,. <br />the initial prediction will be adjusted based on <br />actual flows at Kremmling. That adjustment may result in re- defining the <br />type of hydrologic year and thus the management approach. <br />The prediction of type of hydrologic year is used to define whether a wet, <br />average or dry hydrologic year is in progress in a given year, and the <br />appropriate management considerations to put into play. For example, <br />dry year management may be focused on protecting the survival of fish <br />rather than focusing on an optimal recreational boating experience; <br />Page 6 of 16 <br />
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