Phase A - Alternatives Analysis Report - Urban Drainage and Flood ...
Phase A - Alternatives Analysis Report - Urban Drainage and Flood ...
Phase A - Alternatives Analysis Report - Urban Drainage and Flood ...
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PHASE A – ALTERNATIVES ANALYSIS REPORTMajor <strong>Drainage</strong>way Planning Update for Hidden Lake-Bates LakeJULY 29, 2008Mr. Ken MacKenzie<strong>Urban</strong> <strong>Drainage</strong> <strong>and</strong> <strong>Flood</strong> Control District2480 West 26 th Avenue, Suite 156-BDenver, CO 80211Subject:Dear Mr. MacKenzie:Major <strong>Drainage</strong>way Planning Update for Hidden Lake – Bates Lake<strong>Phase</strong> A - <strong>Alternatives</strong> <strong>Analysis</strong> <strong>Report</strong>UDFCD Agreement No. 08-01.06Matrix Design Group, Inc. is pleased to submit this report entitled Major <strong>Drainage</strong>way Planning Update forHidden Lake-Bates Lake, <strong>Phase</strong> A – <strong>Alternatives</strong> <strong>Analysis</strong> <strong>Report</strong>, dated July 2008.Many changes have occurred in the study area since the last Major <strong>Drainage</strong>way Planning Study wascompleted in 1975. L<strong>and</strong> use has changed <strong>and</strong> there has been extensive development within the watershed,which has changed the imperviousness of the area. Because of the changes in the watershed this <strong>Phase</strong> A<strong>Report</strong> will be used to determine which of the proposed alternatives will be selected to be furtherinvestigated in the <strong>Phase</strong> B <strong>Report</strong> with the selected drainage improvement alternatives.We would like to acknowledge the help <strong>and</strong> support in the preparation of this report that was furnished bythe City of Arvada, the City of Westminster, <strong>and</strong> Adams County.The enclosed text <strong>and</strong> exhibits present the alternatives analyses that were completed for the Hidden Lake-Bates Lake <strong>Drainage</strong>way. <strong>Alternatives</strong> were explored that will either: reduce flooding, improve stormwaterconveyance, or improve water quality.Thank you for the opportunity to complete this phase of the project.Regards,Matrix Design Group, Inc.________________________________________________________________Stu Williams, P.E.Principal-In-Charge________________________________________________________________Robert Krehbiel, P.E.Project Manager________________________________________________________________Tim Fairbank, P.E.Project Engineer________________________________________________________________Jennifer Newby, E.I.EngineerThis study will supersede the alternatives evaluation that was done for the “Major <strong>Drainage</strong>way Planning:Hidden Lake – Bates Lake” by Hydro-Triad, Ltd., dated November 1975.3
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