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HomeMy WebLinkAbout017 - Appendix I - 2025 Flood Hazard StudyN89°31'09"E 1275.68'S1°13'56"W 1295.69' 10+00 0+001+002+003+00 4+00 5+00 6+00 7+00 8+00 9+00 4781.0 4780.0 4781.0 4780.0 4779.0 4779.0 4781. 0 4782. 0 4785 4782 4783 4784 4786 4787478 8 4780 4785 4781 47 8 2 47 8 3 4784 4785 4784 47864787 478847894791 4792 4793 4794 4785 47904786 4 7 8 7 478847894790.00 4787.17 4783.04784.04784.0 4785.0 -0+410+811+833 + 0 0 4 + 0 0 5+006+ 0 0 6+ 6 1 7+007+60 8+008+409+009+90LEGEND EXISTING MAJOR CONTOUR EXISTING MINOR CONTOUR PROPOSED MAJOR CONTOUR PROPOSED MINOR CONTOUR 100 YEAR FLOOD HAZARD LIMITS VERIFY SCALE! THESE PRINTS MAY BE REDUCED. LINE BELOW MEASURES ONE INCH ON ORIGINAL DRAWING. MODIFY SCALE ACCORDINGLY! 2026COPYRIGHT © MORRISON-MAIERLE, SHEET NUMBER PROJECT NUMBER DRAWING NUMBER DATEDESCRIPTIONNO.BY N:\10130\001.01 PREPLAT\ACAD\EXHIBITS\FLOOD HAZARD.DWGREVISIONS DRAWN BY: DSGN. BY: APPR. BY: DATE: Q.C. REVIEW DATE: BY: 2880 Technology Blvd West Bozeman, MT 59718 406.587.0721 www.m-m.net engineers surveyors planners scientists MorrisonMaierle PLOTTED BY:COOPER KRAUSE ON Mar/09/2026 LAUREL MEADOWS SUBDIVISION BOZEMAN MONTANA BAXTER CREEK FLOOD HAZARD MAP N10130.001 EX C EX-C BTB BTB JRN 03/2026 30 6015300 SCALE IN FEET   FUTUR E V A U G H N D R I V E PROPOSED GRAVEL TRAIL LAUREL MEADOWS SUBDIVISION RESTRICTED LOT 1 BAXTER CREEK PROPERTY BOUNDARY MITIGATED WETLAND BOUNDARY CITY P A R K CITY P A R K Worksheet for -0+41 Project Description Manning FormulaFriction Method Normal DepthSolve For Input Data ft/ft0.085Channel Slope cfs223.00Discharge Section Definitions Elevation(ft)Station(ft) 4,795.17-0+57 4,795.03-0+41 4,792.54-0+26 4,791.13-0+19 4,790.33-0+03 4,789.330+00 4,791.100+04 4,791.100+22 4,791.270+54 4,791.780+84 4,792.171+11 Roughness Segment Definitions Roughness CoefficientEnding StationStart Station 0.045(1+11, 4,792.17)(-0+57, 4,795.17) Options Pavlovskii's Method Current Roughness Weighted Method Pavlovskii's Method Open Channel Weighting Method Pavlovskii's Method Closed Channel Weighting Method Results in25.7Normal Depth 0.045Roughness Coefficient ft4,791.47Elevation 4,789.3 to 4,795.2 ftElevation Range ft²39.4Flow Area ft87.5Wetted Perimeter in5.4Hydraulic Radius ft86.88Top Width in25.7Normal Depth in27.5Critical Depth Page 1 of 227 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 3/4/2026 FlowMaster [10.03.00.03] Bentley Systems, Inc. Haestad Methods Solution CenterBaxter Creek Flood Plain-Revised.fm8 Worksheet for -0+41 Results ft/ft0.036Critical Slope ft/s5.66Velocity ft0.50Velocity Head ft2.64Specific Energy 1.482Froude Number SupercriticalFlow Type GVF Input Data in0.0Downstream Depth ft0.0Length 0Number Of Steps GVF Output Data in0.0Upstream Depth N/AProfile Description ft0.00Profile Headloss ft/sInfinityDownstream Velocity ft/sInfinityUpstream Velocity in25.7Normal Depth in27.5Critical Depth ft/ft0.085Channel Slope ft/ft0.036Critical Slope Page 2 of 227 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 3/4/2026 FlowMaster [10.03.00.03] Bentley Systems, Inc. Haestad Methods Solution CenterBaxter Creek Flood Plain-Revised.fm8 Cross Section for -0+41 Project Description Manning FormulaFriction Method Normal DepthSolve For Input Data ft/ft0.085Channel Slope in25.7Normal Depth cfs223.00Discharge Page 1 of 127 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 3/4/2026 FlowMaster [10.03.00.03]Bentley Systems, Inc. Haestad Methods Solution CenterBaxter Creek Flood Plain-Revised.fm8 Worksheet for 0+81.5 Project Description Manning FormulaFriction Method Normal DepthSolve For Input Data ft/ft0.016Channel Slope cfs223.00Discharge Section Definitions Elevation(ft)Station(ft) 4,794.76-0+77 4,790.46-0+60 4,789.44-0+46 4,787.84-0+22 4,788.14-0+03 4,787.320+00 4,788.640+06 4,789.340+24 4,789.640+59 4,789.660+72 4,790.451+04 Roughness Segment Definitions Roughness CoefficientEnding StationStart Station 0.045(1+04, 4,790.45)(-0+77, 4,794.76) Options Pavlovskii's Method Current Roughness Weighted Method Pavlovskii's Method Open Channel Weighting Method Pavlovskii's Method Closed Channel Weighting Method Results in23.5Normal Depth 0.045Roughness Coefficient ft4,789.28Elevation 4,787.3 to 4,794.8 ftElevation Range ft²58.1Flow Area ft65.8Wetted Perimeter in10.6Hydraulic Radius ft65.53Top Width in23.5Normal Depth in20.8Critical Depth Page 1 of 227 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 3/4/2026 FlowMaster [10.03.00.03] Bentley Systems, Inc. Haestad Methods Solution CenterBaxter Creek Flood Plain-Revised.fm8 Worksheet for 0+81.5 Results ft/ft0.032Critical Slope ft/s3.84Velocity ft0.23Velocity Head ft2.19Specific Energy 0.719Froude Number SubcriticalFlow Type GVF Input Data in0.0Downstream Depth ft0.0Length 0Number Of Steps GVF Output Data in0.0Upstream Depth N/AProfile Description ft0.00Profile Headloss ft/s0.00Downstream Velocity ft/s0.00Upstream Velocity in23.5Normal Depth in20.8Critical Depth ft/ft0.016Channel Slope ft/ft0.032Critical Slope Page 2 of 227 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 3/4/2026 FlowMaster [10.03.00.03] Bentley Systems, Inc. Haestad Methods Solution CenterBaxter Creek Flood Plain-Revised.fm8 Cross Section for 0+81.5 Project Description Manning FormulaFriction Method Normal DepthSolve For Input Data ft/ft0.016Channel Slope in23.5Normal Depth cfs223.00Discharge Page 1 of 127 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 3/4/2026 FlowMaster [10.03.00.03]Bentley Systems, Inc. Haestad Methods Solution CenterBaxter Creek Flood Plain-Revised.fm8 Worksheet for 1+82.47 Project Description Manning FormulaFriction Method Normal DepthSolve For Input Data ft/ft0.014Channel Slope cfs223.00Discharge Section Definitions Elevation(ft)Station(ft) 4,792.76-1+13 4,789.78-0+95 4,788.14-0+61 4,787.91-0+30 4,787.23-0+05 4,785.880+00 4,786.990+04 4,787.000+18 4,788.860+31 4,789.290+64 4,789.571+04 Roughness Segment Definitions Roughness CoefficientEnding StationStart Station 0.045(1+04, 4,789.57)(-1+13, 4,792.76) Options Pavlovskii's Method Current Roughness Weighted Method Pavlovskii's Method Open Channel Weighting Method Pavlovskii's Method Closed Channel Weighting Method Results in29.3Normal Depth 0.045Roughness Coefficient ft4,788.32Elevation 4,785.9 to 4,792.8 ftElevation Range ft²69.1Flow Area ft92.1Wetted Perimeter in9.0Hydraulic Radius ft91.68Top Width in29.3Normal Depth in26.8Critical Depth Page 1 of 227 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 3/4/2026 FlowMaster [10.03.00.03] Bentley Systems, Inc. Haestad Methods Solution CenterBaxter Creek Flood Plain-Revised.fm8 Worksheet for 1+82.47 Results ft/ft0.035Critical Slope ft/s3.23Velocity ft0.16Velocity Head ft2.61Specific Energy 0.655Froude Number SubcriticalFlow Type GVF Input Data in0.0Downstream Depth ft0.0Length 0Number Of Steps GVF Output Data in0.0Upstream Depth N/AProfile Description ft0.00Profile Headloss ft/s0.00Downstream Velocity ft/s0.00Upstream Velocity in29.3Normal Depth in26.8Critical Depth ft/ft0.014Channel Slope ft/ft0.035Critical Slope Page 2 of 227 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 3/4/2026 FlowMaster [10.03.00.03] Bentley Systems, Inc. Haestad Methods Solution CenterBaxter Creek Flood Plain-Revised.fm8 Cross Section for 1+82.47 Project Description Manning FormulaFriction Method Normal DepthSolve For Input Data ft/ft0.014Channel Slope in29.3Normal Depth cfs223.00Discharge Page 1 of 127 Siemon Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 3/4/2026 FlowMaster [10.03.00.03]Bentley Systems, Inc. Haestad Methods Solution CenterBaxter Creek Flood Plain-Revised.fm8