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Last modified
8/16/2009 3:09:30 PM
Creation date
10/4/2006 7:05:55 AM
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Board Meetings
Board Meeting Date
3/22/2005
Description
WSP Section and CF Section - Feasibility Study Status Report - La Plata Water Conservancy District - Long Hollow and Red Mesa Ward Reservoirs
Board Meetings - Doc Type
Memo
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<br />,) <br /> <br />; <br /> <br />e <br /> <br />e <br /> <br />e <br /> <br />DRAFT LONG HOLLOW RESERVOIR <br />FEASIBILITY STUDY <br /> <br />1.0 <br /> <br />EXECUTIVE SUMMARY <br /> <br />The Long Hollow Reservoir (LHR) is located in southwest La Plata County, approximately 22 <br />miles southwest of Durango, Colorado in Sections 29, 32, and 33, Township 33 North, Range 12 <br />West of the New Mexico Principal Meridian, The parties shown on Exhibit 3.1-1 privately hold <br />ownership of the dam and existing reservoir site, <br /> <br />Feasibility level drawings for a 5,400-acre-foot (AF) reservoir are presented in Exhibits 3.1-1 <br />through 3.1-5 at the end of this volume in 11-x-17-inch format. The drawings, which will be <br />referred to throughout this report, were developed by combining what appears to be the most <br />advantageous alternative for the dam and appurtenant structures based on available data. Based <br />on analyses by Wright Water Engineers, Inc. (WWE), the reservoir will fill to the 5,400-AF <br />capacity in 4 of 14 years, with an average fill of 3,540 AF per year. LHR will release all or <br />nearly all stored water in 10 of 14 years. A 300-AF La Plata River Compact (Compact) reserve <br />pool in LHR will be used to deliver water to New Mexico during the mid-summer low-flow <br />period when the La Plata River in Colorado must be administered as a split river. <br /> <br />The Rules and Regulations for Dam Safety and Construction from the Office of the State <br />Engineer (SEO) classifies darns according to their hazard and size (Department of Natural <br />Resources 1988). The regulations designate a diun for which loss of human life is expected in <br />the event of a failure as a Hazard Class I dam. If the Long Hollow dam fails, loss' of life is <br />expected. The dam will fall in the large-size classification because it will have a height greater <br />than 100 feet and a reservoir capacity greater than 1,000 AF. <br /> <br />The SEO's regulations require that the inflow design flood (IDF) for determining the spillway <br />capacity of a Class I large-size dam shall be the probable maximum precipitation (PMP). <br /> <br />991.077.120 <br />March 2005 <br /> <br />Wrt9ht Water Engineers. Inc. <br /> <br />Page 1 <br />3/15/2005 12:49 PM <br />
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