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Home My WebLink About208-WestPark-FloodHazardEval FLOOD HAZARD REPORT FOR WEST PARK SUBDIVISION BOZEMAN GALLATIN COUNTY MONTANA Prepared By: Morrison-Maierle, Inc. .� �orrison 2880 Technology Blvd. West � Maierle P.O. Box 1113 engineers srrveyors p(anners scientests Bozeman, Montana 59771-1113 ,�:,., - �„r, ��' - �_,. � ` � "�a Engineer: James Nickelson, PE � -'�# :,�r �., ,_.., ;;� Date: May 2, 2022 �Y� J �, g��t . '�� ,�'A t.rt :i � S' .t::�.1•.� e . . •�,. �` File: 10130.001 ' , <;4 . << � I1 ��2 (J`LL_ INTRODUCTION This report provides an analysis of the flood hazard for the proposed West Park Subdivision. The 40-acre development has one waterway, Baxter Creek, that runs south to north through the property. Baxter Creek runs through the eastern portion of the property and is classified as stream/ditch because it is fed by natural drainage and irrigation. Wetland plants surround the creek which meanders through cultivated pasture. METHOD Morrison-Maierle surveyed the 40-acre property, including the water ways with GPS survey equipment. Cross sections were developed approximately every 100 ft along each water way in AutoCAD. Bentley Flowmaster V10.02 was used to analyze each cross section to determine the water surface elevation for the given flow rate. The water surface elevation was then mapped in AutoCAD to show the extents of flooding in the current condition and areas that will require grading to contain flood waters. BAXTER CREEK Baxter Creek flows through the easterly portion of the proposed subdivision. There is not a defined floodplain associated with Baxter Creek as it has not been mapped as part of the FEMA process. The Baxter Creek corridor will be located in a proposed park as part of the subdivision. As part of the original Norton East Ranch Annexation and Phase 1 of Norton East Ranch Subdivision, the owner of the property at that time placed a covenant on the Baxter Creek corridor which limits almost all activity within the corridor and as such the floodplain impacts on the developable land within the proposed subdivision will be limited. Numerous engineering reports have been completed for Baxter Creek as part of the numerous development projects that exist above and below this project. The Valley West Subdivision identified the 100-year, 24 hour peak flow rate at Durston Road to be 114 cubic feet per second, that analysis reviewed upstream flow paths and looked at limiting restrictions, such as road crossing culverts. This value is documented in the Drainage Plan for the Valley West Subdivision. As part of Phase 1 of the Norton East Ranch Subdivision, Sanderson Stewart prepared a flood hazard evaluation of Baxter Creek which utilized a different approach in estimating the 100- year, 24 hour peak flow event. The methodology utilized the SCS method to determine the flow based on the area of the drainage basin. Based on that, the 100-year flow at Babcock was estimated to be 223 cubic feet per second. In the same report Sanderson Stewart describe the determination of n-values used to estimate channel flow rates. The value of 0.0045 used by Sanderson Stewart is also appropriate for the Baxter Creek reach flowing through the West Park subdivision, which is a winding natural channel with pools and shoals. The attached Exhibit C shows the limits of the 100-year flood hazard area. 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' Y 'O�1 ISO� � 2880T2Chf1010 BIVdWESI DSGN.BY: BTB WESTPARKSUBDIVISION LINE BELOW MEASURES ONE INCH 9Y SHEET NUMBER oN oRiciNn�orznwiNc. Bozeman,MT 59718 APPR.BY: JRN , � M a i e r I e BOZEMAN MONTANA ex c �_� � DATE: DRAWING NUMBER mooiFvscn�enccoRoiNc�v�, � www.m-m.net Q.C.REVIEW BAXTER CREEK FLOOD HAZARD MAP engineers surveyors planners scientists gy. Z PLOTTEO BV'.BEN BERRV ON Apr/29/2022 COPVRIGHT�OMORRISON-MAIERLE,2022 DATE: 3+00 Flood Elevation Project Description Friction Method Manning Formula Solve For Normal Depth Input Data Channel Slope 0.085 ft/ft Discharge 223.00 cfs Section Definitions Station Elevation �ft) �ft) -0+62 4,788.10 -0+30 4,787.00 0+00 4,785.50 0+21 4,786.39 0+42 4,787.99 0+56 4,787.39 Roughness Segment Definitions Start Station Ending Station Roughness Coefficient (-0+62,4,788.10) (0+56,4,787.39) 0.045 Options Current Roughness Weighted Pavlovskii's Method Method Open Channel Weighting Pavlovskii's Method Method Closed Channel Weighting Pavlovskii's Method Method Results Normal Depth 14.5 in Elevation Range 4,785.5 to 4,788.1 ft Flow Area 31.3 ft2 Wetted Perimeter 49.4 ft Hydraulic Radius 7.6 in Top Width 49.32 ft Normal Depth 14.5 in Critical Depth 17.5 in Critical Slope 0.032 ft/ft Velocity 7.12 ft/s Velocity Head 0.79 ft Specific Energy 2.00 ft Froude Number 1.576 Flow Type Supercritical Bentley Systems,Inc. Haestad Methods Solution FlowMaster Baxter Creek Flood Plain.fm8 Center [10.02.00.01] 4/20/2022 27 Siemon Company Drive Suite 200 W Page 1 of 2 Watertown,CT 06795 USA +1- 3+00 Flood Elevation GVF Input Data Downstream Depth 0.0 in Length 0.0 ft Number Of Steps 0 GVF Output Data Upstream Depth 0.0 in Profile Description N/A Profile Headloss 0.00 ft Downstream Velocity Infinity ft/s Upstream Velocity Infinity ft/s Normal Depth 14.5 in Critical Depth 17.5 in Channel Slope 0.085 ft/ft Critical Slope 0.032 ft/ft Bentley Systems,Inc. Haestad Methods Solution FlowMaster Baxter Creek Flood Plain.fm8 Center [10.02.00.01] 4/20/2022 27 Siemon Company Drive Suite 200 W Page 2 of 2 Watertown,CT 06795 USA +1- Baxter Creek Cross Section for 3+00 Project Description Friction Method Manning Formula Solve For Normal Depth Input Data Channel Slope 0.085 ft/ft Normal Depth 14.5 in Discharge 223.00 cfs 4788.40 473Q.��i 4735.�� 4787.80 ' 4,87.6u 4787.40 , ----- � 4787.20 � � , _ 0 478i.00 Y ; a,s6.so °' 4736.6U w . 4786.40 � i 4786.20 1 �_ �- 4786.OG � 4785.80 � � � 4735.5�� 4735.�3�� 4?35.2�1 -0+50 O+On 0+50 Station FlowMaster Baxter Creek Flood Plain.fm8 Bentley Systems,Inc. Haestad Methods Solution Center [10.02.00.01] 4/26/2022 27 Siemon Company Drive Suite 200 W Watertown,CT 06795 USA Page 1 of 1 +1- Worksheet for 4+00 Project Description Friction Method Manning Formula Solve For Normal Depth Input Data Channel Slope 0.085 ft/ft Discharge 223.00 cfs Section Definitions Station Elevation �ft) �ft) -0+95 4,788.53 -0+30 4,786.13 0+00 4,784.67 0+14 4,785.63 0+27 4,785.20 0+43 4,787.67 Roughness Segment Definitions Start Station Ending Station Roughness Coefficient (-0+95,4,788.53) (0+43,4,787.67) 0.045 Options Current Roughness Weighted Pavlovskii's Method Method Open Channel Weighting Pavlovskii's Method Method Closed Channel Weighting Pavlovskii's Method Method Results Normal Depth 14.6 in Elevation Range 4,784.7 to 4,788.5 ft Flow Area 33.0 ft2 Wetted Perimeter 56.3 ft Hydraulic Radius 7.0 in Top Width 56.19 ft Normal Depth 14.6 in Critical Depth 17.2 in Critical Slope 0.033 ft/ft Velocity 6.76 ft/s Velocity Head 0.71 ft Specific Energy 1.92 ft Froude Number 1.554 Flow Type Supercritical Bentley Systems,Inc. Haestad Methods Solution FlowMaster Baxter Creek Flood Plain.fm8 Center [10.02.00.01] 4/20/2022 27 Siemon Company Drive Suite 200 W Page 1 of 2 Watertown,CT 06795 USA +1- Worksheet for 4+00 GVF Input Data Downstream Depth 0.0 in Length 0.0 ft Number Of Steps 0 GVF Output Data Upstream Depth 0.0 in Profile Description N/A Profile Headloss 0.00 ft Downstream Velocity Infinity ft/s Upstream Velocity Infinity ft/s Normal Depth 14.6 in Critical Depth 17.2 in Channel Slope 0.085 ft/ft Critical Slope 0.033 ft/ft Bentley Systems,Inc. Haestad Methods Solution FlowMaster Baxter Creek Flood Plain.fm8 Center [10.02.00.01] 4/20/2022 27 Siemon Company Drive Suite 200 W Page 2 of 2 Watertown,CT 06795 USA +1- Cross Section for 4+00 Project Description Friction Method Manning Formula Solve For Normal Depth Input Data Channel Slope 0.085 ft/ft Normal Depth 14.6 in Discharge 223.00 cfs 4788.5u 4788.00 4787.50 � 4787.�i�i 0 Y � �i > �3786.5i i m w ' 4786.00 4785.5i i 4785.00 473�3.5U -0+50 0+00 Station FlowMaster Baxter Creek Flood Plain.fm8 Bentley Systems,Inc. Haestad Methods Solution Center [10.02.00.01] 4/29/2022 27 Siemon Company Drive Suite 200 W Watertown,CT 06795 USA Page 1 of 1 +1- Worksheet for 5+00 Project Description Friction Method Manning Formula Solve For Normal Depth Input Data Channel Slope 0.085 ft/ft Discharge 223.00 cfs Section Definitions Station Elevation �ft) �ft) -0+85 4,786.87 -0+61 4,785.90 -0+42 4,785.11 0+00 4,783.11 0+13 4,784.60 0+26 4,784.69 0+42 4,784.70 0+54 4,784.80 0+65 4,786.34 0+79 4,786.44 Roughness Segment Definitions Start Station Ending Station Roughness Coefficient (-0+85,4,786.87) (0+79,4,786.44) 0.045 Options Current Roughness Weighted Pavlovskii's Method Method Open Channel Weighting Pavlovskii's Method Method Closed Channel Weighting Pavlovskii's Method Method Results Normal Depth 16.8 in Elevation Range 4,783.1 to 4,786.9 ft Flow Area 29.4 ft2 Wetted Perimeter 42.0 ft Hydraulic Radius 8.4 in Top Width 41.90 ft Normal Depth 16.8 in Critical Depth 21.0 in Critical Slope 0.036 ft/ft Velocity 7.59 ft/s Velocity Head 0.90 ft Bentley Systems,Inc. Haestad Methods Solution FlowMaster Baxter Creek Flood Plain.fm8 Center [10.02.00.01] 4/20/2022 27 Siemon Company Drive Suite 200 W Page 1 of 2 Watertown,CT 06795 USA +1- Worksheet for 5+00 Results Specific Energy 2.30 ft Froude Number 1.599 Flow Type Supercritical GVF Input Data Downstream Depth 0.0 in Length 0.0 ft Number Of Steps 0 GVF Output Data Upstream Depth 0.0 in Profile Description N/A Profile Headloss 0.00 ft Downstream Velocity Infinity ft/s Upstream Velocity Infinity ft/s Normal Depth 16.8 in Critical Depth 21.0 in Channel Slope 0.085 ft/ft Critical Slope 0.036 ft/ft Bentley Systems,Inc. Haestad Methods Solution FlowMaster Baxter Creek Flood Plain.fm8 Center [10.02.00.01] 4/20/2022 27 Siemon Company Drive Suite 200 W Page 2 of 2 Watertown,CT 06795 USA +1- Baxter Creek Cross Section for 5+00 Project Description Friction Method Manning Formula Solve For Normal Depth Input Data Channel Slope 0.085 ft/ft Normal Depth 16.8 in Discharge 223.00 cfs 4787,�ii i �3786.50 -----i 4786.00 --- i � 4785.5i i I o , y y 4785.�iii m "' 473�1.5�� 478d.�iii 4783.50 ! � 47g;,pr� -0+50 O+OQ 0+517 Station FlowMaster Baxter Creek Flood Plain.fm8 Bentley Systems,Inc. Haestad Methods Solution Center [10.02.00.01] 4/29/2022 27 Siemon Company Drive Suite 200 W Watertown,CT 06795 USA Page 1 of 1 +1- Worksheet for 6+00 Project Description Friction Method Manning Formula Solve For Normal Depth Input Data Channel Slope 0.085 ft/ft Discharge 223.00 cfs Section Definitions Station Elevation �ft) �ft) -0+80 4,789.80 -0+68 4,786.21 -0+56 4,785.02 -0+46 4,784.98 -0+32 4,784.41 0+00 4,782.74 0+10 4,783.02 0+34 4,783.51 0+49 4,783.39 0+63 4,783.09 0+80 4,784.29 0+93 4,784.25 Roughness Segment Definitions Start Station Ending Station Roughness Coefficient (-0+80,4,789.80) (0+93,4,784.25) 0.045 Options Current Roughness Weighted Pavlovskii's Method Method Open Channel Weighting Pavlovskii's Method Method Closed Channel Weighting Pavlovskii's Method Method Results Normal Depth 11.5 in Elevation Range 4,782.7 to 4,789.8 ft Flow Area 39.7 ft2 Wetted Perimeter 89.6 ft Hydraulic Radius 5.3 in Top Width 89.53 ft Normal Depth 11.5 in Critical Depth 13.2 in Critical Slope 0.036 ft/ft Bentley Systems,Inc. Haestad Methods Solution FlowMaster Baxter Creek Flood Plain.fm8 Center [10.02.00.01] 4/20/2022 27 Siemon Company Drive Suite 200 W Page 1 of 2 Watertown,CT 06795 USA +1- Worksheet for 6+00 Results Velocity 5.61 ft/s Velocity Head 0.49 ft Specific Energy 1.45 ft Froude Number 1.484 Flow Type Supercritical GVF Input Data Downstream Depth 0.0 in Length 0.0 ft Number Of Steps 0 GVF Output Data Upstream Depth 0.0 in Profile Description N/A Profile Headloss 0.00 ft Downstream Velocity Infinity ft/s Upstream Velocity Infinity ft/s Normal Depth 11.5 in Critical Depth 13.2 in Channel Slope 0.085 ft/ft Critical Slope 0.036 ft/ft Bentley Systems,Inc. Haestad Methods Solution FlowMaster Baxter Creek Flood Plain.fm8 Center [10.02.00.01] 4/20/2022 27 Siemon Company Drive Suite 200 W Page 2 of 2 Watertown,CT 06795 USA +1- Baxter Creek Cross Section for 6+00 Project Description Friction Method Manning Formula Solve For Normal Depth Input Data Channel Slope 0.085 ft/ft Normal Depth 11.5 in Discharge 223.00 cfs 4790.i70 4789.50 4789.00 4788.5p --- — - — — 4788.On _ -- - — — 4787.5p --- - — — � 4787.Op --- - — — � - — � 4786.50 -- - — � 4?85.��i - � 1_ w 4?85.5�� 4735.i]ii � 4784.5i i 478�3.Oi i ' 4733.50 a�s�.no 478�.5�i -0+50 0+00 0+50 Station FlowMaster Baxter Creek Flood Plain.fm8 Bentley Systems,Inc. Haestad Methods Solution Center [10.02.00.01] 4/29/2022 27 Siemon Company Drive Suite 200 W Watertown,CT 06795 USA Page 1 of 1 +1- Worksheet for 6+61 Project Description Friction Method Manning Formula Solve For Normal Depth Input Data Channel Slope 0.085 ft/ft Discharge 223.00 cfs Section Definitions Station Elevation �ft) �ft) -0+45 4,787.34 -0+35 4,784.10 -0+29 4,785.73 -0+06 4,783.15 0+00 4,782.20 0+16 4,783.25 0+46 4,783.50 0+60 4,783.46 0+88 4,782.97 1+00 4,783.47 1+05 4,783.99 1+12 4,784.30 Roughness Segment Definitions Start Station Ending Station Roughness Coefficient (-0+45,4,787.34) (1+12,4,784.30) 0.045 Options Current Roughness Weighted Pavlovskii's Method Method Open Channel Weighting Pavlovskii's Method Method Closed Channel Weighting Pavlovskii's Method Method Results Normal Depth 16.7 in Elevation Range 4,782.2 to 4,787.3 ft Flow Area 43.4 ft2 Wetted Perimeter 111.3 ft Hydraulic Radius 4.7 in Top Width 111.13 ft Normal Depth 16.7 in Critical Depth 18.1 in Critical Slope 0.037 ft/ft Bentley Systems,Inc. Haestad Methods Solution FlowMaster Baxter Creek Flood Plain.fm8 Center [10.02.00.01] 4/20/2022 27 Siemon Company Drive Suite 200 W Page 1 of 2 Watertown,CT 06795 USA +1- Worksheet for 6+61 Results Velocity 5.14 ft/s Velocity Head 0.41 ft Specific Energy 1.80 ft Froude Number 1.451 Flow Type Supercritical GVF Input Data Downstream Depth 0.0 in Length 0.0 ft Number Of Steps 0 GVF Output Data Upstream Depth 0.0 in Profile Description N/A Profile Headloss 0.00 ft Downstream Velocity Infinity ft/s Upstream Velocity Infinity ft/s Normal Depth 16.7 in Critical Depth 18.1 in Channel Slope 0.085 ft/ft Critical Slope 0.037 ft/ft Bentley Systems,Inc. Haestad Methods Solution FlowMaster Baxter Creek Flood Plain.fm8 Center [10.02.00.01] 4/20/2022 27 Siemon Company Drive Suite 200 W Page 2 of 2 Watertown,CT 06795 USA +1- Baxter Creek Cross Section for 6+61 Project Description Friction Method Manning Formula Solve For Normal Depth Input Data Channel Slope 0.085 ft/ft Normal Depth 16.7 in Discharge 223.00 cfs 4787.50 4787.00 �3786.5n 4786.i70 ' --- � 4785.50 y 4785.iiii — +c m 478450 w 4734.�ii i 478.;.50 4783.i ip 4,32.5�! 478�.00 0+0� 0+50 1+00 Station FlowMaster Baxter Creek Flood Plain.fm8 Bentley Systems,Inc. Haestad Methods Solution Center [10.02.00.01] 4/29/2022 27 Siemon Company Drive Suite 200 W Watertown,CT 06795 USA Page 1 of 1 +1- Worksheet for 7+00 Project Description Friction Method Manning Formula Solve For Normal Depth Input Data Channel Slope 0.085 ft/ft Discharge 223.00 cfs Section Definitions Station Elevation �ft) �ft) -0+59 4,787.04 -0+48 4,784.48 -0+36 4,784.01 -0+24 4,782.87 -0+13 4,782.63 0+00 4,782.14 0+03 4,781.95 0+10 4,782.63 0+48 4,783.36 0+75 4,782.99 0+90 4,782.90 1+00 4,783.18 1+10 4,783.93 Roughness Segment Definitions Start Station Ending Station Roughness Coefficient (-0+59,4,787.04) (1+10,4,783.93) 0.045 Options Current Roughness Weighted Pavlovskii's Method Method Open Channel Weighting Pavlovskii's Method Method Closed Channel Weighting Pavlovskii's Method Method Results Normal Depth 15.1 in Elevation Range 4,782.0 to 4,787.0 ft Flow Area 43.1 ft2 Wetted Perimeter 109.6 ft Hydraulic Radius 4.7 in Top Width 109.48 ft Normal Depth 15.1 in Critical Depth 16.7 in Bentley Systems,Inc. Haestad Methods Solution FlowMaster Baxter Creek Flood Plain.fm8 Center [10.02.00.01] 4/20/2022 27 Siemon Company Drive Suite 200 W Page 1 of 2 Watertown,CT 06795 USA +1- Worksheet for 7+00 Results Critical Slope 0.038 ft/ft Velocity 5.18 ft/s Velocity Head 0.42 ft Specific Energy 1.68 ft Froude Number 1.454 Flow Type Supercritical GVF Input Data Downstream Depth 0.0 in Length 0.0 ft Number Of Steps 0 GVF Output Data Upstream Depth 0.0 in Profile Description N/A Profile Headloss 0.00 ft Downstream Velocity Infinity ft/s Upstream Velocity Infinity ft/s Normal Depth 15.1 in Critical Depth 16.7 in Channel Slope 0.085 ft/ft Critical Slope 0.038 ft/ft Bentley Systems,Inc. Haestad Methods Solution FlowMaster Baxter Creek Flood Plain.fm8 Center [10.02.00.01] 4/20/2022 27 Siemon Company Drive Suite 200 W Page 2 of 2 Watertown,CT 06795 USA +1- Baxter Creek Cross Section for 7+00 Project Description Friction Method Manning Formula Solve For Normal Depth Input Data Channel Slope 0.085 ft/ft Normal Depth 15.1 in Discharge 223.00 cfs 4787.00 4786.50 4786.00 47855�i � 4785.U0 -� Y y 4784.50 � m w �3784.i��i 4733.5�� 4783.Oi i 478250 . , 4782.u0 -0+50 O+ul7 0+50 1+00 Station FlowMaster Baxter Creek Flood Plain.fm8 Bentley Systems,Inc. Haestad Methods Solution Center [10.02.00.01] 4/29/2022 27 Siemon Company Drive Suite 200 W Watertown,CT 06795 USA Page 1 of 1 +1- Worksheet for 7+60 Project Description Friction Method Manning Formula Solve For Normal Depth Input Data Channel Slope 0.085 ft/ft Discharge 223.00 cfs Section Definitions Station Elevation �ft) �ft) -0+39 4,786.88 -0+25 4,784.67 -0+12 4,782.73 0+00 4,781.70 0+30 4,781.98 0+43 4,781.85 0+57 4,783.22 0+96 4,783.26 1+00 4,783.17 Roughness Segment Definitions Start Station Ending Station Roughness Coefficient (-0+39,4,786.88) (1+00,4,783.17) 0.045 Options Current Roughness Weighted Pavlovskii's Method Method Open Channel Weighting Pavlovskii's Method Method Closed Channel Weighting Pavlovskii's Method Method Results Normal Depth 9.7 in Elevation Range 4,781.7 to 4,786.9 ft Flow Area 33.6 ft2 Wetted Perimeter 58.9 ft Hydraulic Radius 6.8 in Top Width 58.82 ft Normal Depth 9.7 in Critical Depth 12.2 in Critical Slope 0.033 ft/ft Velocity 6.64 ft/s Velocity Head 0.68 ft Specific Energy 1.49 ft Bentley Systems,Inc. Haestad Methods Solution FlowMaster Baxter Creek Flood Plain.fm8 Center [10.02.00.01] 4/20/2022 27 Siemon Company Drive Suite 200 W Page 1 of 2 Watertown,CT 06795 USA +1- Worksheet for 7+60 Results Froude Number 1.548 Flow Type Supercritical GVF Input Data Downstream Depth 0.0 in Length 0.0 ft Number Of Steps 0 GVF Output Data Upstream Depth 0.0 in Profile Description N/A Profile Headloss 0.00 ft Downstream Velocity Infinity ft/s Upstream Velocity Infinity ft/s Normal Depth 9.7 in Critical Depth 12.2 in Channel Slope 0.085 ft/ft Critical Slope 0.033 ft/ft Bentley Systems,Inc. Haestad Methods Solution FlowMaster Baxter Creek Flood Plain.fm8 Center [10.02.00.01] 4/20/2022 27 Siemon Company Drive Suite 200 W Page 2 of 2 Watertown,CT 06795 USA +1- Baxter Creek Cross Section for 7+60 Project Description Friction Method Manning Formula Solve For Normal Depth Input Data Channel Slope 0.085 ft/ft Normal Depth 9.7 in Discharge 223.00 cfs 4787.00 4786.5�J 4786.00 4785.50 � 4785.00 -- — 0 y a�sa.s�� , _ — — � a�sa.ou w 4783.50 4783.�i�i 4782.50 4,3?.�ii i 4781.5�i 0+00 0+50 1+0 Station FlowMaster Baxter Creek Flood Plain.fm8 Bentley Systems,Inc. Haestad Methods Solution Center [10.02.00.01] 4/29/2022 27 Siemon Company Drive Suite 200 W Watertown,CT 06795 USA Page 1 of 1 +1- Worksheet for 8+00 Project Description Friction Method Manning Formula Solve For Normal Depth Input Data Channel Slope 0.085 ft/ft Discharge 223.00 cfs Section Definitions Station Elevation �ft) �ft) -0+62 4,785.72 -0+55 4,786.26 -0+52 4,784.90 -0+41 4,784.34 -0+18 4,782.90 0+00 4,781.20 0+11 4,781.20 0+24 4,781.70 0+35 4,781.77 0+49 4,782.82 0+66 4,783.46 Roughness Segment Definitions Start Station Ending Station Roughness Coefficient (-0+62,4,785.72) (0+66,4,783.46) 0.045 Options Current Roughness Weighted Pavlovskii's Method Method Open Channel Weighting Pavlovskii's Method Method Closed Channel Weighting Pavlovskii's Method Method Results Normal Depth 11.9 in Elevation Range 4,781.2 to 4,786.3 ft Flow Area 31.8 ft2 Wetted Perimeter 51.4 ft Hydraulic Radius 7.4 in Top Width 51.34 ft Normal Depth 11.9 in Critical Depth 14.7 in Critical Slope 0.032 ft/ft Velocity 7.01 ft/s Bentley Systems,Inc. Haestad Methods Solution FlowMaster Baxter Creek Flood Plain.fm8 Center [10.02.00.01] 4/20/2022 27 Siemon Company Drive Suite 200 W Page 1 of 2 Watertown,CT 06795 USA +1- Worksheet for 8+00 Results Velocity Head 0.76 ft Specific Energy 1.75 ft Froude Number 1.569 Flow Type Supercritical GVF Input Data Downstream Depth 0.0 in Length 0.0 ft Number Of Steps 0 GVF Output Data Upstream Depth 0.0 in Profile Description N/A Profile Headloss 0.00 ft Downstream Velocity Infinity ft/s Upstream Velocity Infinity ft/s Normal Depth 11.9 in Critical Depth 14.7 in Channel Slope 0.085 ft/ft Critical Slope 0.032 ft/ft Bentley Systems,Inc. Haestad Methods Solution FlowMaster Baxter Creek Flood Plain.fm8 Center [10.02.00.01] 4/20/2022 27 Siemon Company Drive Suite 200 W Page 2 of 2 Watertown,CT 06795 USA +1- Baxter Creek Cross Section for 8+00 Project Description Friction Method Manning Formula Solve For Normal Depth Input Data Channel Slope 0.085 ft/ft Normal Depth 11.9 in Discharge 223.00 cfs 4786.5i i 4786.00 �3785.5�! I I 47 3 5.�i i i ' ------i � 4784.50 1 - � y 4784.iiii , I +c 1 -- m 4783.50 w I a;s�.�� , , a�sz.sn � a�s2.uo I � 4,31.5�! 4781.0�i -0+50 0+�]n 0+5�7 Station FlowMaster Baxter Creek Flood Plain.fm8 Bentley Systems,Inc. Haestad Methods Solution Center [10.02.00.01] 4/29/2022 27 Siemon Company Drive Suite 200 W Watertown,CT 06795 USA Page 1 of 1 +1- Worksheet for 8+40 Project Description Friction Method Manning Formula Solve For Normal Depth Input Data Channel Slope 0.085 ft/ft Discharge 223.00 cfs Section Definitions Station Elevation �ft) �ft) -0+63 4,785.66 -0+50 4,783.56 -0+39 4,782.59 -0+16 4,781.32 -0+03 4,780.50 0+00 4,780.65 0+13 4,780.30 0+29 4,781.80 0+49 4,782.40 0+66 4,782.70 0+78 4,783.10 0+91 4,783.40 Roughness Segment Definitions Start Station Ending Station Roughness Coefficient (-0+63,4,785.66) (0+91,4,783.40) 0.045 Options Current Roughness Weighted Pavlovskii's Method Method Open Channel Weighting Pavlovskii's Method Method Closed Channel Weighting Pavlovskii's Method Method Results Normal Depth 13.9 in Elevation Range 4,780.3 to 4,785.7 ft Flow Area 29.8 ft2 Wetted Perimeter 43.7 ft Hydraulic Radius 8.2 in Top Width 43.56 ft Normal Depth 13.9 in Critical Depth 17.3 in Critical Slope 0.031 ft/ft Bentley Systems,Inc. Haestad Methods Solution FlowMaster Baxter Creek Flood Plain.fm8 Center [10.02.00.01] 4/20/2022 27 Siemon Company Drive Suite 200 W Page 1 of 2 Watertown,CT 06795 USA +1- Worksheet for 8+40 Results Velocity 7.48 ft/s Velocity Head 0.87 ft Specific Energy 2.03 ft Froude Number 1.594 Flow Type Supercritical GVF Input Data Downstream Depth 0.0 in Length 0.0 ft Number Of Steps 0 GVF Output Data Upstream Depth 0.0 in Profile Description N/A Profile Headloss 0.00 ft Downstream Velocity Infinity ft/s Upstream Velocity Infinity ft/s Normal Depth 13.9 in Critical Depth 17.3 in Channel Slope 0.085 ft/ft Critical Slope 0.031 ft/ft Bentley Systems,Inc. Haestad Methods Solution FlowMaster Baxter Creek Flood Plain.fm8 Center [10.02.00.01] 4/20/2022 27 Siemon Company Drive Suite 200 W Page 2 of 2 Watertown,CT 06795 USA +1- Baxter Creek Cross Section for 8+40 Project Description Friction Method Manning Formula Solve For Normal Depth Input Data Channel Slope 0.085 ft/ft Normal Depth 13.9 in Discharge 223.00 cfs 4786.00 4785.50 4?85.00 ---- � 4734.5�� j � 4,84.�ii i 0 473;.5�i --- ---- Y '� 4783.Vii I > m ---- ;_ w 4782.5i i i 478200 478150 4781.00 — 4780.50 4;g0,Uu -0+50 iJ+00 0+50 Station FlowMaster Baxter Creek Flood Plain.fm8 Bentley Systems,Inc. Haestad Methods Solution Center [10.02.00.01] 4/29/2022 27 Siemon Company Drive Suite 200 W Watertown,CT 06795 USA Page 1 of 1 +1- Worksheet for 9+00 Project Description Friction Method Manning Formula Solve For Normal Depth Input Data Channel Slope 0.085 ft/ft Discharge 223.00 cfs Section Definitions Station Elevation �ft) �ft) -0+59 4,784.08 -0+33 4,783.07 -0+10 4,780.09 0+00 4,780.09 0+12 4,780.40 0+24 4,780.88 0+49 4,781.85 Roughness Segment Definitions Start Station Ending Station Roughness Coefficient (-0+59,4,784.08) (0+49,4,781.85) 0.045 Options Current Roughness Weighted Pavlovskii's Method Method Open Channel Weighting Pavlovskii's Method Method Closed Channel Weighting Pavlovskii's Method Method Results Normal Depth 12.1 in Elevation Range 4,780.1 to 4,784.1 ft Flow Area 30.9 ft2 Wetted Perimeter 47.7 ft Hydraulic Radius 7.8 in Top Width 47.62 ft Normal Depth 12.1 in Critical Depth 15.2 in Critical Slope 0.032 ft/ft Velocity 7.22 ft/s Velocity Head 0.81 ft Specific Energy 1.82 ft Froude Number 1.580 Flow Type Supercritical Bentley Systems,Inc. Haestad Methods Solution FlowMaster Baxter Creek Flood Plain.fm8 Center [10.02.00.01] 4/20/2022 27 Siemon Company Drive Suite 200 W Page 1 of 2 Watertown,CT 06795 USA +1- Worksheet for 9+00 GVF Input Data Downstream Depth 0.0 in Length 0.0 ft Number Of Steps 0 GVF Output Data Upstream Depth 0.0 in Profile Description N/A Profile Headloss 0.00 ft Downstream Velocity Infinity ft/s Upstream Velocity Infinity ft/s Normal Depth 12.1 in Critical Depth 15.2 in Channel Slope 0.085 ft/ft Critical Slope 0.032 ft/ft Bentley Systems,Inc. Haestad Methods Solution FlowMaster Baxter Creek Flood Plain.fm8 Center [10.02.00.01] 4/20/2022 27 Siemon Company Drive Suite 200 W Page 2 of 2 Watertown,CT 06795 USA +1- Baxter Creek Cross Section for 9+00 Project Description Friction Method Manning Formula Solve For Normal Depth Input Data Channel Slope 0.085 ft/ft Normal Depth 12.1 in Discharge 223.00 cfs 4734.i ii i 4783.50 4783.00 0 4782.5i i y � > �%$�,IIII N W I 4731.50 4781.i i�i 478�i.5�i 47gii.iiii -0+50 n+00 0+5 Station FlowMaster Baxter Creek Flood Plain.fm8 Bentley Systems,Inc. Haestad Methods Solution Center [10.02.00.01] 4/29/2022 27 Siemon Company Drive Suite 200 W Watertown,CT 06795 USA Page 1 of 1 +1- Worksheet for 9+90 Project Description Friction Method Manning Formula Solve For Normal Depth Input Data Channel Slope 0.085 ft/ft Discharge 223.00 cfs Section Definitions Station Elevation �ft) �ft) -0+82 4,782.44 -0+72 4,781.93 -0+14 4,779.20 0+00 4,778.61 0+14 4,779.42 0+23 4,779.89 0+32 4,779.92 0+44 4,779.96 0+63 4,780.00 0+75 4,780.00 0+87 4,779.68 1+00 4,779.94 1+17 4,780.77 Roughness Segment Definitions Start Station Ending Station Roughness Coefficient (-0+82,4,782.44) (1+17,4,780.77) 0.045 Options Current Roughness Weighted Pavlovskii's Method Method Open Channel Weighting Pavlovskii's Method Method Closed Channel Weighting Pavlovskii's Method Method Results Normal Depth 16.9 in Elevation Range 4,778.6 to 4,782.4 ft Flow Area 46.5 ft2 Wetted Perimeter 132.5 ft Hydraulic Radius 4.2 in Top Width 132.39 ft Normal Depth 16.9 in Critical Depth 18.0 in Bentley Systems,Inc. Haestad Methods Solution FlowMaster Baxter Creek Flood Plain.fm8 Center [10.02.00.01] 4/20/2022 27 Siemon Company Drive Suite 200 W Page 1 of 2 Watertown,CT 06795 USA +1- Worksheet for 9+90 Results Critical Slope 0.039 ft/ft Velocity 4.80 ft/s Velocity Head 0.36 ft Specific Energy 1.76 ft Froude Number 1.428 Flow Type Supercritical GVF Input Data Downstream Depth 0.0 in Length 0.0 ft Number Of Steps 0 GVF Output Data Upstream Depth 0.0 in Profile Description N/A Profile Headloss 0.00 ft Downstream Velocity Infinity ft/s Upstream Velocity Infinity ft/s Normal Depth 16.9 in Critical Depth 18.0 in Channel Slope 0.085 ft/ft Critical Slope 0.039 ft/ft Bentley Systems,Inc. Haestad Methods Solution FlowMaster Baxter Creek Flood Plain.fm8 Center [10.02.00.01] 4/20/2022 27 Siemon Company Drive Suite 200 W Page 2 of 2 Watertown,CT 06795 USA +1- Baxter Creek Cross Section for 9+90 Project Description Friction Method Manning Formula Solve For Normal Depth Input Data Channel Slope 0.085 ft/ft Normal Depth 16.9 in Discharge 223.00 cfs 4782.5U �3782.iiii 4781.50 � 4781.Oii o _ yr r y 478ii.5�� , � � � � w 47gii.iiii 4774.5�! 477g,iip � ' , 4778.5u -0+50 iJ+00 0+50 1+00 Station FlowMaster Baxter Creek Flood Plain.fm8 Bentley Systems,Inc. Haestad Methods Solution Center [10.02.00.01] 4/29/2022 27 Siemon Company Drive Suite 200 W Watertown,CT 06795 USA Page 1 of 1 +1-