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WSPC12967
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Last modified
1/26/2010 4:35:02 PM
Creation date
4/24/2008 12:44:35 PM
Metadata
Fields
Template:
Water Supply Protection
File Number
8230.400.32.2.b
Description
Silverthorne RICD - 04CW217
State
CO
Basin
Colorado Mainstem
Water Division
5
Date
8/5/2005
Author
Various
Title
Silverthorne RICD - 04CW217 - Correspondence between Denver Water and CWCB
Water Supply Pro - Doc Type
Report/Study
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<br />Bill - <br /> <br />I noticed the new language (see below) in the revised CWCB finding regarding ramping. <br />This sounds similar to what you mentioned to me in hall as I was leaving the hearing. I <br />like the idea of ramping up the call at the start of the holiday event. But to protect the <br />fishery, the call needs to ramped up and down each day for both the 100 cfs call and the <br />600 cfs call. Without this provision, I am quite concerned that Silverthorne would force <br />Denver Water to make abrupt flow changes that could be harmful to the Silverthorne <br />fishery. Frankly, I don't understand why the CWCB, DOW, TU and Silverthorne are not <br />concerned. Maybe I have not explained the situation well enough. <br /> <br />Silverthorne has not agreed to limit its call to times that would not be adverse to DW's <br />supply. So, when Silverthorne places a call adverse to DW's supply, DW would be <br />forced under this new RICD to abruptly shut down from the flow 600 to 50 cfs the flow <br />at 8 pm each night ofthe holiday event and abruptly turn it up from 50 cfs to 600 cfs at 7 <br />am each morning. Under the new finding there would be ramping only one time, at the <br />start of the event. Silverthorne (CWCB, DOW and TU) should not expect that Denver <br />Water will be in position to voluntarily give up water supply so that the ramping can be <br />done during the 8 pm to 7 am no call time period. To protect the fishery, there needs to <br />be a provision for ramping both calls (100 and 600) up each day starting at 7 am and <br />ramping the call down each day so that at 8 pm the flow is at 50 cfs again. From <br />discussing ramping with the DOW and TU, I got the impression this is what they thought <br />Silverthorne agreed to do. Given the cold water and air temperatures at 7 am and 8 pm, I <br />don't think there would be much use, if any, being made of the 600 cfs at that these <br />times. It would be a much more efficient use of water and better for the fishery to be <br />ramping during these hours rather than having abrupt flow changes made at these times. <br /> <br />If the holiday boating event is not being forced by Silverthorne's call, but is something <br />DW is sponsoring, I really see no need for the call or the RICD. DW's rafting event over <br />Labor Day 2004 worked quite well without any RICD or any assistance from or <br />coordination with Silverthorne. We worked out a ramping schedule with DOW and the <br />boating community that ramped up from 7 am to noon each day and down from 4 pm to 8 <br />pm each evening. That ramping schedule seemed to work well for both the boating and <br />the fishery and made best use of a limited supply of water available. I hope Silverthorne <br />will agree to a similar approach. <br />
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