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FLOOD11154
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Last modified
1/29/2010 10:12:13 AM
Creation date
12/28/2007 3:39:33 PM
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Floodplain Documents
County
Jefferson
Arapahoe
Basin
South Platte
Title
Chatfield Reallocation Study: Agenda 09/23/2007
Date
9/23/2007
Prepared For
Meeting Participants
Prepared By
CWCB
Floodplain - Doc Type
Agenda
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<br />allow partial water storage to take place if that would help <br />avoid impacts to the construction efforts. This is not to <br />imply that anything but the most rapid completion of <br />mitigation activities would be found to be acceptable. <br /> <br />. Economic analyses <br />o Confirm that direction as agreed to in the Aug. 9th meeting <br />is valid <br />o Deal with the groundwater alternative by proving that it is <br />not the least cost alternative. <br />o Is there a true need to have water demand descriptions from <br />each of the 15 Water Users even though CWCB is the only <br />contracting entity with Corps? (e.g. can we just use SWSI <br />as originally planned?) <br />o PDT RECOMMENDATION -The analysis focuses only <br />on M&I, and the sponsor is willing to forgo the cost share <br />on Ag. The economic feasibility analysis will show the <br />following: a.) Composite water demand of the proponent, <br />b.) We will take conservation into account (although it <br />really only is an attenuation of actual demand - it will be <br />described from a point of view of social acceptance and for <br />elimination of unacceptable measures), c.) Groundwater <br />will be investigated as a potential alternative, both alone <br />and in a conjunctive use with other sources. d) Water <br />demand will be considered over a sufficient period during <br />which Chatfield can be shown to be fully utilized.] e.) The <br />economic study period is set at 50 years. Demand will be <br />aggregated based on reasonable and practicable, most- <br />likely, least cost alternatives for reallocation. Information <br />currently in hand is believed to be sufficient for this <br />exerC1se. <br /> <br />. Seismic issues <br />o Continue funding ground motion study and related SSR <br />Phase I work <br />o Make a case that if there is a seismic deficiency at <br />Chatfield, it's a pre-existing condition that needs to be <br />fixed by the Corps regardless of the reallocation. The <br />reallocation itself will not necessarily make seismic issues <br />worse. <br />o PDT RECOMMENDATION: A final Phase 1 Special <br />Study may not be needed for the approval of the <br />Reallocation Feasibility Report. An evaluation to <br />determine a pre-existing condition would do. If a pre <br />existing condition is found to exist, and the problem is not <br />significantly exacerbated, either in probability or in <br /> <br />5 <br />
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