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WSP02897
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Last modified
1/26/2010 12:47:33 PM
Creation date
10/11/2006 11:26:01 PM
Metadata
Fields
Template:
Water Supply Protection
File Number
8443.600
Description
Narrows Unit - Studies
State
CO
Basin
South Platte
Water Division
1
Date
2/1/1978
Author
US DoI BoR
Title
Special Report Investigation of Review Issues Narrows Unit- Colorado Pick - Sloan Missouri Basin Program
Water Supply Pro - Doc Type
Report/Study
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<br />discharge of the Platte River at Overton due to Narrows Dam and <br />Reservoir is anticipated due to the distance of about 300 river miles <br />between the proposed Narrows Dam and the crane habitat area. Al so, <br />there is a contributing drainage area below the Narrows Dam site and <br />Kingsley Dam of about 15,200 square miles. Rainfall events occurring <br />over these 15,200 square mil es woul d conti nue to produce 1 arge peak <br />floods resulting in no significant changes in the peak flows having a <br />recurrence interval of 2 years. <br /> <br />Ice jams will continue to oecur with the resultant scouring action <br />movement and continual shifting of the streambed that hel ps maintain <br />the open channel of un vegetated sandbars (USBR, 1977). <br /> <br />Impacts to .the Wet Meadow Compl ex <br /> <br />There are two "schools of thought" within th.e Department of the Interior <br />regarding the impacts of additional flow depletions on wet meadow <br />habitat.. It is stated on pages 9 and 87 of the Geological Survey <br />report (1975): <br /> <br />"The survival of the wet-meadow complex adjacent to the Platte <br />River in central Nebr~ska probably is dependent on relatively <br />high river stages during the winter and early spring. The <br />probable hydrologic factors that affect the ecologic health <br />of the wet-meadow compl ex inel ude hi gh strE;!am stages that <br />result ina high water table during the January-April period. <br />The high water levels during this period provide Tor healthy <br />growth of the wet-meadow vegetation that discourages the <br />encroachment of other vegetati on. II <br /> <br />The Fish and Wildlife Service believes that cumulative surface flow. <br />depletions from planned and proposed water rE;!source development <br />projects and varied types of 1 and development, as described previously , <br />could eventually lead to the Joss of most of the Platte.'swet meadow <br />habitat. <br /> <br />According to the Bureau of Reclamation's Narrows Unit .Final Environmental <br />Statement (1976): <br /> <br />"The Narrows Unit will have little effect on the late winter <br />and early spring flows of the Platte River on the average. <br />The peak flows on the South Platte River are somewhat later,. <br />i.e., May and June, and .would not contribute to the vital <br />high water table during the January-April period. Therefore, <br />the wet-meadow' complex should be maintained." <br /> <br />33 <br /> <br /> <br />.-' ",...-". <br /> <br /> <br /> <br /> <br />
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