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 Lake5.5.4 Reach H-4This reach is dominated by Lake Sangraco itself and extends form where the existing 96-inch CMP stormsewer discharges to Aloha Beach Lake, through both Aloha Beach Lake and Lake Sangraco, and the openchannel east of the Lake Sangraco outlet to Clear Creek.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 revises the 96-inch CMP outlet to have low flows discharge into a forebay north of 62 ndAve. A connection between the forebay pond and Lake L’Nor will also need to be made.Alternative PlanTable 5-5: Reach H-4 Alternative Cost EstimatesStructuralImprovementsTrafficControlUtilityRelocationsPropertyAcquisitionEngineering,CM, &ContingenciesOperation &MaintenanceAlternativeTotalREACH H-4: Aloha Beach Lake to Clear Creek1a Do nothing $0 $0 $0 $0 $0 $0 $04aRevise the 96-inchRCP outlet to havelow flows dischargeinto a fore-bay northof 62 nd Ave.$189,000 $18,900 $9,450 $9,200 $66,150 $6,000 $298,7005-10
483618483624W 64TH AV24TENNYSON ST3096r e e kC368C l e a12I-76D i t c h68X4348F i s h e r24603636r14FEDERAL BDW 65TH AV8318LOWELL BD18W 61ST PLH-4: 4aLow flow diversionand water qualitypond2472Jim BakerReservoir LakeSangraco54UNION PACIFIC RAILROAD30124836303668X4321W 60TH AV0 300 600FeetFIGURE 5-4HIDDEN LAKE REACH H-4ALTERNATIVES ANALYSIS5-11LegendHEC-RAS CenterlineMajor BasinSecondary BasinCounty BoundaryExisting Storm PipeInundated Building FootprintProposed Water Quality100-Year FloodplainFILE: \\Tartarus\gis\gis_projects\UDFCD_Hidden_Lake\08.155.006\active\apps\HiddenLake_Reach_H-4_Map.mxd, 7/25/2008, chris_martin
Page 1 and 2: MAJOR DRAINAGEWAY PLANNINGUPDATE FO
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Page 25 and 26: Figure 3-3 Hidden Lake Peak Dischar
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Page 39: LegendHEC-RAS CenterlineMajor Basin
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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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Page 89 and 90: APPENDIX CHydraulic AnalysisPHASE A
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Table C-1 HEC-RAS Summary TablePHAS
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PHASE A - ALTERNATIVES ANALYSIS REP
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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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Phase A - Alternatives Analysis Report - Urban Drainage and Flood ...

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