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 LakeA summarized input file from the EPA SWMM model is included in Table B-4 in Appendix B, whichincludes the physical attributes assigned to each conveyance element used in the EPA SWMM model.3.5 Previous StudiesUpdated flow rates within the study area have been modeled. The flows that were determined as part of thisstudy were compared to the flows determined in the 1975 study at similar design points. This comparisoncan be seen in Table 3-2.3.6 Results of AnalysisAs can be seen in Table 3-2, some of the current flow rates are smaller and some are larger than thosedetermined in the 1975 study. However, none of the flows determined in this study are drastically differentthan those determined in the 1975 study. These differences in flows were anticipated and can be attributedto the physical improvements within the study area such as storm sewer pipe improvements, sub basin redelineation,change in imperviousness for the future condition, the construction of the James BakerReservoir, and the use of newer computer modeling software programs: Colorado Urban HydrographProcedure (CUHP) 2005 and EPA Storm Water Management Model (SWMM) 5.0. The flows determinedas part of this study will be used to verify the capacity of existing facilities and plan proposed improvementswith in the study area.A summarized output file from the EPA SWMM model is included in Table b-5 in Appendix B. The 10-year and the 100-year inflow and outflow hydrographs for each of the detention basins modeled can be seenon Figure B-1 in Appendix B. The hydrographs for all of the storm evens modeled can be seen on Figure B-2 in Appendix B for several key design points.(1975)DesignPoint(2008)DesignPointLocationTable 3-2Comparison of Peak FlowsFuture Land Use Peak Flow (cfs)2-Year 10-Year 100-YearUDSWMM(1975)EPASWMM(2008)UDSWMM(1975)EPASWMM(2008)UDSWMM(1975)EPASWMM(2008)H-1 10268th, 69th & PierceStreet 120 173 367 405 500 826H-2 103 69th & Ingalls Street 180 239 548 525 755 924H-3 10469th & SheridanBlvd. 412 481 1,255 991 1,693 1,589H-4 110/111Hidden Lake at DamIn/Out 566 / 14 665/43 1,611 / 73 1,256/130 2,171 / 326 2,323/296H-6 112 64th & Lowell Blvd. 131 102 378 251 507 545H-7 113 Jim Baker Reservoir 173 146 500 358 671 807H-8 117Lake Sangraco atDam 195 97 522 217 709 553B-1 200/201Bates Lake at DamIn/Out 125 / 22 91/22 350 / 25 233/25 466 / 26 519/26B-3 204 Sheridan & Railroad 151 222 498 457 675 917C-2 118Clear Creek &Railroad 115 99 261 224 335 567C-3 C3Federal & ClearCreek 58 57 162 117 215 2573-2
184812P I E R C E S TW A D S W O R T H B DW 7 6 T H A V3648B R A D B U R N B D188Z U N I S TFranklinReservoir3024lh100418W 7 2 N D A V1216181004A15332118W 7 0 T H A V2142151002182772601002A480S H E R I D A N B D46153615E S T E S S T184HiddenLake1818P E C O S S T24A V1253C536P I E R C E S T36184830W 6 4 T H A V2421W 6 4 T H A V15GordonLake96422000C-4152000AW 6 2 N D A VC4111 95%AC24G A R R I S O N S TL A M A R S T2007A20074824C A R R S TLakeSangraco4836548W 6 0 T H A Vk181182001A200168X43c h3068X43e r D i tW 5 8 T H A V36DeweyLakei s hF12W A D S W O R T H B D763024hcW 5 6 T H A Va0X00X00BURLINGTON NORTHERN SANTA FET E N N Y S O N S T12780X01224152418T E J O N S TP E C O S S T06036W 5 3 R D A V24305 2 N D A V1548W 5 2 N D A V3630E L P A S O B Dr e e k C a n a lCrC l e aC r e e kC l e a rUNION PACIFIC RAILROADK S Tw e roLti n D iW 5 6 T H A VW 7 6 T H A V54W 6 8 T H A V0X08430603636R o c k y M o u n t1818F E D E R A L B D12141448L O W E L L B DW 7 4 T H A VW 7 2 N D A VW 6 8 T H A VW 6 2 N D A VO B E R O N R DG R A N D V I E W A VI N D E P E N D E N C E S TJ E F F E R S O N C O U N T Y2421A D A M S C O U N T Y24212415015271542544800181512303618211836018121512152115181818121830X1972Jim BakerReservoir48182761814181510184224012365466J E F F E R S O NC O U N T YA D A M SC O U N T Y20924365454D E N V E R C O U N T Y18301524188363015241812424663315123018818182412824181512181518183612301821244012B-7165 56%ACC-2162 56%AC181218360X00X0 0X0 0X00X0 0X00X00X068X431524600X00X0481836181212H-3157 49%H-2ACH3H-1H2111 43%ACH1H-796 38%ACH-4121 48%ACH-5111 47%ACB-2110 54%ACB-3121 72%ACH-9H-889 46%AC118 62%ACH-10117 53%ACB-4H-11156 78%ACH-15147 69%ACB-9133 72%ACC-5120 49%AC10051005A50 35%ACB-182 49%AC100110061001AH410031003AH5H7B1H-683 50%AC105 65%ACB-697 57%ACB-829 81%ACH-1358 48%ACH-1499 44%AC2010H-1683 75%ACH-1298 48%ACC-393 56%AC1013B3H6B2H8H9B4B8B6B710142006B-5200449 76%ACC-1200962 45%AC3624183012UNION PACIFIC RAILROAD482412183030200820032002B5B9C1C2C310001000A4242101102103200201203104204H10H11206110207H13114H14H16111113115112H12116H15117210205208287361015C r e e ka relCe erCh u rch Di18ht ci n e C a n a lF a r mr s H i ge12C a n a lC r o k e24OberonLakes2415OberonLakesBatesLake105101010111011A20051518151515a l s t o n CRBURLINGTON NORTHERN SANTA FE0 1,000 2,000FeetFIGURE 3-1SUB-BASIN ROUTING MAPHIDDEN LAKE AND BATES LAKE3-3LegendSubbasinArea % IMPDesign PointDetentionSplit FlowRouting ElementRouting LineMajor BasinSecondary BasinSubbasinCounty BoundaryExisting Storm MainFILE: \\Tartarus\gis\gis_projects\UDFCD_Hidden_Lake\08.155.006\active\apps\HiddenLake_Hydrology_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
Page 27 and 28: 450400350Sheriden Blvd.North of Rai
Page 35 and 36: 48121830X1948W 76TH AV2724818242415
Page 37 and 38: W 72ND AV273324W 70TH AV722760W 69T
Page 39 and 40: LegendHEC-RAS CenterlineMajor Basin
Page 41 and 42: 483618483624W 64TH AV24TENNYSON ST3
Page 43 and 44: 18HiddenLakeWADSWORTH BD1830X1953LA
Page 45 and 46: 1230TENNYSON ST9624SHERIDAN BDWOLFF
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Page 55 and 56: 48121830X1948W 76TH AV2724218182424
Page 57 and 58: LegendHEC-RAS CenterlineMajor Basin
Page 59 and 60: 18HiddenLake18WADSWORTH BD1830X1953
Page 63 and 64: APPENDIX AMeeting MinutesPHASE A -
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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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