Phase A - Alternatives Analysis Report - Urban Drainage and Flood ...

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PHASE A – ALTERNATIVES ANALYSIS REPORTMajor Drainageway Planning Update for Hidden Lake-Bates Lake5.5.2 Reach H-2This reach is dominated by Hidden Lake itself and extends from the intersection of Sheridan Boulevard and69 th Avenue to the outlet of Hidden Lake.Alternative 1: No Drainageway ImprovementsAs previously discussed, the purpose of this alternative is to maintain the existing channel and crossingstructures without implementing additional improvements to increase conveyance or improve flood proneareas. It does consider general routine, restorative and rehabilitation maintenance of the existing channel andfacilities. The annual costs of maintenance have been estimated based on the facilities within the reach.Alternative 4a: Water QualityThis alternative constructs a wetland east of Sheridan Blvd, south of 69 th Ave. This wetland will be locatedjust downstream of the two major outfalls to Hidden Lake from the west. This facility will trap trash, filterstormwater, and allow sediments to settle out of stormwater before the runoff enters Hidden Lake.Alternative PlanTable 5-3: Reach H-2 Alternative Cost EstimatesStructuralImprovementsTrafficControlUtilityRelocationsPropertyAcquisitionEngineering,CM, &ContingenciesOperation &MaintenanceAlternativeTotalREACH H-2: Hidden Lake1a Do nothing $0 $0 $0 $0 $0 $0 $04a Construct wetlandeast of SheridanBlvd, south of 69thAve.$200,272 $0 $0 $0 $70,095 $10,000 $280,3675-6
W 72ND AV273324W 70TH AV722760W 69TH AV36HiddenLake53TENNYSON STSHERIDAN BDW 64TH AV12151512483642BURLINGTON NORTHERN SANTA FE36018W 68TH AVLOWELL BD181512W 67TH AV181824W 66TH AV30X191212W 65TH AV36 48 18301818181521H-2: 4aWetlands eastof Sheridan21541836612360 300 600FeetLegendHEC-RAS CenterlineMajor BasinSecondary BasinCounty BoundaryExisting Storm PipeInundated Building FootprintProposed Water Quality100-Year FloodplainFIGURE 5-2HIDDEN LAKE REACH H-2ALTERNATIVES ANALYSIS5-7FILE: \\Tartarus\gis\gis_projects\UDFCD_Hidden_Lake\08.155.006\active\apps\HiddenLake_Reach_H-2_Map.mxd, 7/25/2008, chris_martin
Page 1 and 2: MAJOR DRAINAGEWAY PLANNINGUPDATE FO
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Page 9 and 10: P I E R C E S TW A D S W O R T H B
Page 17 and 18: CP I E R C E S TW A D S W O R T H B
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Page 25 and 26: Figure 3-3 Hidden Lake Peak Dischar
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Page 45 and 46: 1230TENNYSON ST9624SHERIDAN BDWOLFF
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Page 57 and 58: LegendHEC-RAS CenterlineMajor Basin
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Page 63 and 64: APPENDIX AMeeting MinutesPHASE A -
Page 73 and 74: APPENDIX BHydrologic AnalysisPHASE
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PHASE A - ALTERNATIVES ANALYSIS REP
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APPENDIX CHydraulic AnalysisPHASE A
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Table C-1 HEC-RAS Summary TablePHAS
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Jim Baker Reservoir SpillwayPHASE A
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APPENDIX DLegal OpinionPHASE A - AL
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APPENDIX EEnvironmental InventoryPH
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APPENDIX FDamage AnalysisPHASE A -
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