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 Lake5.5.6 Reach B-2This reach is immediately north and adjacent to the Union Pacific Railroad and extends from whereSheridan Boulevard crosses the railroad to where Tennyson Street crosses the railroad.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 3a: Improved ConveyanceThis alternative constructs an improved channel north of the Union Pacific Railroad tracks betweenSheridan Boulevard and Tennyson Street. This open channel will have the capacity to convey the 100-yearstorm flows that exceed the capacity of the proposed pipes under the railroad tracks, which will extend toClear Creek, at the extension of Depew Street and at Sheridan Boulevard.Alternative 3b: Improved ConveyanceThis alternative constructs a direct reinforced box culvert connection between the proposed open channelalong the north side of the Union Pacific Railroad tracks and Jim Baker Reservoir. Currently high flowspond up on the west side of Tennyson Street and ultimately overtop Tennyson Street and flow overland intoJim Baker Reservoir.Alternative PlanStructuralImprovementsTable 5-7: Reach B-2 Alternative Cost EstimatesTrafficControlUtilityRelocationsPropertyAcquisitionEngineering,CM, &ContingenciesOperation &MaintenanceAlternativeTotalReach B-2: Along Railroad Tracks from Sheridan Boulevard to Tennyson Street1a Do nothing $0 $0 $0 $0 $0 $0 $0Build an improvedchannel north ofthe railroad tracksand Construct a3adirect pipe3bconnection underTennyson St. toJames BakerReservoir.$489,225 $48,923 $48,923 $38,475 $171,229 $15,000 $811,7745-14
1230TENNYSON ST9624SHERIDAN BDWOLFF ST48W 60TH AV303668X433660h181818LOWELL BD72W 61ST PLJim BakerReservoir LakeSangraco2454363012B-2: 3a100-yr channelB-2: 3bBox culvert underneathTennyson481830303612UNION PACIFIC RAILROAD68X43keC r el e a rCi t cDreI-76s hiF361515082427BatesLake1824UNION PACIFIC RAILROADR a l st o n C r e e k3638X240 300 600FeetLegendHEC-RAS CenterlineMajor BasinSecondary BasinCounty BoundaryExisting Storm PipeInundated Building FootprintProposed Conveyance100-Year FloodplainFIGURE 5-6BATES LAKE REACH B-2ALTERNATIVES ANALYSIS5-15FILE: \\Tartarus\gis\gis_projects\UDFCD_Hidden_Lake\08.155.006\active\apps\HiddenLake_Reach_B-2_Map.mxd, 7/25/2008, chris_martin
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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
Page 91 and 92: Table C-1 HEC-RAS Summary TablePHAS
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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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