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HomeMy WebLinkAbout18G Aajker Flood Analysis Page 1 of 2 The Lakes at Valley West Flood Analysis for Aajker Creek January 27, 2015 Part 1 Introduction This report provides hydrologic and hydraulic calculations to delineate the Aajker Creek floodplain, in support of The Lakes at Valley West subdivision. The site is a 65-acre residential development located south of Durston Road, between Gooch Hill Road and Cottonwood Road. Aajker Creek exists along and just west of the project boundary, flowing due north under Durston Road. The majority of runoff in Aajker Creek comes from areas south of Huffine Lane; the 100-year flow was conservatively estimated to match the capacity of the two culverts under Huffine. Refer to the attached Figure 1. In addition, approximately 163 acres south of the site historically drained across the site to Durston Road, then west to Aajker Creek. The western 110 acres of this “run-on” water will be intercepted at the south property line and directed west to Aajker Creek in a new ditch, called the “South Cutoff Ditch” in the attached calculations. The remaining 53 acres of run-on water will be intercepted at the south property line and directed east to the onsite constructed wetlands, through the East Lake and then the West Lake, and eventually back into Aajker Creek (refer to Section 27 of this Preliminary Plat submittal). Part 2 Major Drainage (Flood) Routing USGS topography and project-specific (i.e., surveyed) topography between Huffine Lane and Durston Road both indicate drainage generally flows to the north-northwest. This would direct any streambank overflow to the west side of the stream, and away from the project site. Surveyed cross-sections and existing, surveyed culvert overflow points also indicate overflow would occur to the west (offsite) rather than to the east, and would not re-enter Aajker Creek downstream of the point(s) of overflow. This means that when the stream is at flood stage, much of the runoff spills out the west side of the stream and flows overland to Durston Road, without re-entering Aajker Creek. The 100-year peak runoff in Aajker Creek at the project site was conservatively estimated to match the capacity of the two existing culverts under Huffine Lane. Because of the length of the basin, the direct runoff from the much smaller area north of Huffine Lane will have passed under Durston Road before much runoff from the upper basin reaches the site. The existing culvert capacities are: 1. Primary: in-stream 48” CMP, 400 feet east of Gooch Hill Road, Q = 134.44 cfs 2. Secondary: contributing 36” CMP, 1,200 feet east of Gooch Hill Road, Q = 56.44 cfs The total of the above two runoff sources is approximately 191 cfs, which represents the 100-year peak runoff in Aajker Creek between Huffine Road and Durston Road. Hydraulic calculations are attached. Page 2 of 2 Part 3 100-Year Floodplain Delineation The flow in Aajker Creek along the project’s west boundary is made up of two components: 1. Existing 36” CMP Stream Culvert: This culvert is under a small dirt road near the project’s southwest corner. Just upstream of the culvert, the stream channel’s capacity is 45.66 cfs. However, the culvert’s capacity at the surveyed overtopping elevation (4759.0) is only 20.45 cfs; the excess, up to 25.21 cfs, overtops and runs downslope to the northwest, away from Aajker Creek. Hydraulic calculations are attached. 2. Direct Runoff: Direct runoff entering Aajker Creek between the above-described 36” CMP culvert and Durston Road was calculated as sub-basin D1.1(A+B) in the onsite drainage report (Section 27 of this Preliminary Plat submittal), and is primarily “run-on” water from offsite areas to the south. The 100-year peak runoff was calculated to be 17.46 cfs. This runoff currently flows overland and in an existing swale to Aajker Creek, through the existing West Pond on the project site. The proposed South Cutoff Ditch will intercept 110 acres of offsite runoff and discharge into Aajker Creek just downstream of the existing 36” CMP stream culvert. The total of the above two runoff sources is 37.91 cfs, which represents the 100-year peak runoff in the stream channel adjacent to the project site. This flow was routed through 10 representative cross-sections using FlowMaster software, and the resulting water surface elevations were transferred to a plan view using surveyed spot elevations and elevation contours. The 100-year peak runoff will not overtop either streambank of Aajker Creek adjacent to the proposed project. Hydraulic calculations for open channel flow through the stream channel are attached. The 100-year flood limits are shown on the attached Figure 2, and also on Figure A preceding the Baxter Creek calculations in this Section. N:\5352\002\Design Docs\Reports\Storm\Aajker floodplain\Aajker 100-yr flood report.doc (this page left blank intentionally) MAJOR DRAINAGE (FLOOD) ROUTING HYDRAULIC CALCULATIONS (this page left blank intentionally) Culvert Calculator Report 48" CMP (Huffine) Title: The Lakes at Valley West - Aajker flood limits n:\...\storm\aajker floodplain\culverts.cvm 01/22/15 09:14:19 PM Morrison Maierle Inc © Bentley Systems, Inc. Haestad Methods Solution Center Watertown, CT 06795 USA +1-203-755-1666 Project Engineer: mhickman CulvertMaster v3.3 [03.03.00.04] Page 1 of 1 Solve For: Discharge Culvert Summary Allowable HW Elevation 10.74 ft Headwater Depth/Height 2.25 Computed Headwater Elevation 10.74 ft Discharge 134.44 cfs Inlet Control HW Elev. 8.81 ft Tailwater Elevation 2.55 ft Outlet Control HW Elev. 10.74 ft Control Type Outlet Control Grades Upstream Invert 1.74 ft Downstream Invert 0.00 ft Length 145.00 ft Constructed Slope 1.20 % Hydraulic Profile Profile CompositeM2PressureProfile Depth, Downstream 3.46 ft Slope Type Mild Normal Depth N/A ft Flow Regime Subcritical Critical Depth 3.46 ft Velocity Downstream 11.64 ft/s Critical Slope 2.75 % Section Section Shape Circular Mannings Coefficient 0.024 Section Material CMP Span 4.00 ft Section Size 48 inch Rise 4.00 ft Number Sections 1 Outlet Control Properties Outlet Control HW Elev. 10.74 ft Upstream Velocity Head 1.78 ft Ke 0.50 Entrance Loss 0.89 ft Inlet Control Properties Inlet Control HW Elev. 8.81 ft Flow Control N/A Inlet Type Headwall Area Full 12.6 ft² K 0.00780 HDS 5 Chart 2 M 2.00000 HDS 5 Scale 1 C 0.03790 Equation Form 1 Y 0.69000 Project Description Friction Method Manning Formula Solve For Normal Depth Input Data Roughness Coefficient 0.035 Channel Slope 1.10 % Left Side Slope 3.00 ft/ft (H:V) Right Side Slope 3.00 ft/ft (H:V) Bottom Width 2.00 ft Discharge 134.44 ft³/s Results Normal Depth 2.55 ft Flow Area 24.62 ft² Wetted Perimeter 18.13 ft Hydraulic Radius 1.36 ft Top Width 17.31 ft Critical Depth 2.32 ft Critical Slope 1.74 % Velocity 5.46 ft/s Velocity Head 0.46 ft Specific Energy 3.01 ft Froude Number 0.81 Flow Type Subcritical GVF Input Data Downstream Depth 0.00 ft Length 0.00 ft Number Of Steps 0 GVF Output Data Upstream Depth 0.00 ft Profile Description Profile Headloss 0.00 ft Downstream Velocity Infinity ft/s Upstream Velocity Infinity ft/s Normal Depth 2.55 ft Critical Depth 2.32 ft Channel Slope 1.10 % 48" TW calc (Huffine) 1/22/2015 9:15:14 PM Bentley Systems, Inc. Haestad Methods Solution CenterBentley FlowMaster V8i (SELECTseries 1) [08.11.01.03] 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 2of1Page Culvert Calculator Report 36" CMP (Huffine) Title: The Lakes at Valley West - Aajker flood limits n:\...\storm\aajker floodplain\culverts.cvm 01/22/15 09:16:31 PM Morrison Maierle Inc © Bentley Systems, Inc. Haestad Methods Solution Center Watertown, CT 06795 USA +1-203-755-1666 Project Engineer: mhickman CulvertMaster v3.3 [03.03.00.04] Page 1 of 1 Solve For: Discharge Culvert Summary Allowable HW Elevation 112.40 ft Headwater Depth/Height 3.12 Computed Headwater Elevation 112.40 ft Discharge 56.44 cfs Inlet Control HW Elev. 107.51 ft Tailwater Elevation 101.77 ft Outlet Control HW Elev. 112.40 ft Control Type Outlet Control Grades Upstream Invert 103.04 ft Downstream Invert 99.93 ft Length 339.00 ft Constructed Slope 0.92 % Hydraulic Profile Profile CompositeM2PressureProfile Depth, Downstream 2.44 ft Slope Type Mild Normal Depth N/A ft Flow Regime Subcritical Critical Depth 2.44 ft Velocity Downstream 9.18 ft/s Critical Slope 2.48 % Section Section Shape Circular Mannings Coefficient 0.024 Section Material CMP Span 3.00 ft Section Size 36 inch Rise 3.00 ft Number Sections 1 Outlet Control Properties Outlet Control HW Elev. 112.40 ft Upstream Velocity Head 0.99 ft Ke 0.50 Entrance Loss 0.50 ft Inlet Control Properties Inlet Control HW Elev. 107.51 ft Flow Control N/A Inlet Type Headwall Area Full 7.1 ft² K 0.00780 HDS 5 Chart 2 M 2.00000 HDS 5 Scale 1 C 0.03790 Equation Form 1 Y 0.69000 Project Description Friction Method Manning Formula Solve For Normal Depth Input Data Roughness Coefficient 0.035 Channel Slope 0.90 % Left Side Slope 3.00 ft/ft (H:V) Right Side Slope 3.00 ft/ft (H:V) Bottom Width 2.00 ft Discharge 56.44 ft³/s Results Normal Depth 1.84 ft Flow Area 13.87 ft² Wetted Perimeter 13.65 ft Hydraulic Radius 1.02 ft Top Width 13.05 ft Critical Depth 1.56 ft Critical Slope 1.95 % Velocity 4.07 ft/s Velocity Head 0.26 ft Specific Energy 2.10 ft Froude Number 0.70 Flow Type Subcritical GVF Input Data Downstream Depth 0.00 ft Length 0.00 ft Number Of Steps 0 GVF Output Data Upstream Depth 0.00 ft Profile Description Profile Headloss 0.00 ft Downstream Velocity Infinity ft/s Upstream Velocity Infinity ft/s Normal Depth 1.84 ft Critical Depth 1.56 ft Channel Slope 0.90 % 36" TW calc (Huffine) 1/22/2015 9:15:55 PM Bentley Systems, Inc. Haestad Methods Solution CenterBentley FlowMaster V8i (SELECTseries 1) [08.11.01.03] 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 2of1Page 100-YEAR RUNOFF CALCULATIONS (this page left blank intentionally) Project Description Friction Method Manning Formula Solve For Discharge Input Data Channel Slope 0.73 % Normal Depth 2.37 ft Section Definitions Station (ft)Elevation (ft) 0+00.0 59.95 0+45.7 59.94 0+49.0 58.69 0+49.7 57.63 0+54.5 57.77 0+57.3 57.82 0+58.5 59.08 0+61.6 59.87 0+65.2 60.20 1+01.7 60.02 Roughness Segment Definitions Start Station Ending Station Roughness Coefficient (0+00.0, 59.95) (1+01.7, 60.02)0.035 Options Current Roughness Weighted Method Pavlovskii's Method Open Channel Weighting Method Pavlovskii's Method Closed Channel Weighting Method Pavlovskii's Method Results Discharge 54.31 ft³/s Elevation Range 57.63 to 60.20 ft Flow Area 26.86 ft² sta. 14+59 (to overflow) 1/22/2015 9:18:16 PM Bentley Systems, Inc. Haestad Methods Solution CenterBentley FlowMaster V8i (SELECTseries 1) [08.11.01.03] 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 2of1Page Results Wetted Perimeter 64.51 ft Hydraulic Radius 0.42 ft Top Width 63.02 ft Normal Depth 2.37 ft Critical Depth 1.23 ft Critical Slope 2.05 % Velocity 2.02 ft/s Velocity Head 0.06 ft Specific Energy 2.43 ft Froude Number 0.55 Flow Type Subcritical GVF Input Data Downstream Depth 0.00 ft Length 0.00 ft Number Of Steps 0 GVF Output Data Upstream Depth 0.00 ft Profile Description Profile Headloss 0.00 ft Downstream Velocity Infinity ft/s Upstream Velocity Infinity ft/s Normal Depth 2.37 ft Critical Depth 1.23 ft Channel Slope 0.73 % Critical Slope 2.05 % sta. 14+59 (to overflow) 1/22/2015 9:18:16 PM Bentley Systems, Inc. Haestad Methods Solution CenterBentley FlowMaster V8i (SELECTseries 1) [08.11.01.03] 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 2of2Page Project Description Friction Method Manning Formula Solve For Discharge Input Data Channel Slope 0.87 % Normal Depth 2.34 ft Section Definitions Station (ft)Elevation (ft) 0+00.0 59.21 0+43.7 59.17 0+48.0 58.23 0+49.1 56.86 0+52.5 56.94 0+55.7 56.99 0+57.0 58.70 0+64.4 59.20 0+66.8 59.33 1+02.6 59.10 Roughness Segment Definitions Start Station Ending Station Roughness Coefficient (0+00.0, 59.21) (1+02.6, 59.10)0.035 Options Current Roughness Weighted Method Pavlovskii's Method Open Channel Weighting Method Pavlovskii's Method Closed Channel Weighting Method Pavlovskii's Method Results Discharge 45.66 ft³/s Elevation Range 56.86 to 59.33 ft Flow Area 23.82 ft² stream sta. 13+86 (to overflow) 1/22/2015 9:17:40 PM Bentley Systems, Inc. Haestad Methods Solution CenterBentley FlowMaster V8i (SELECTseries 1) [08.11.01.03] 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 2of1Page Results Wetted Perimeter 70.77 ft Hydraulic Radius 0.34 ft Top Width 69.04 ft Normal Depth 2.34 ft Critical Depth 1.16 ft Critical Slope 2.11 % Velocity 1.92 ft/s Velocity Head 0.06 ft Specific Energy 2.40 ft Froude Number 0.58 Flow Type Subcritical GVF Input Data Downstream Depth 0.00 ft Length 0.00 ft Number Of Steps 0 GVF Output Data Upstream Depth 0.00 ft Profile Description Profile Headloss 0.00 ft Downstream Velocity Infinity ft/s Upstream Velocity Infinity ft/s Normal Depth 2.34 ft Critical Depth 1.16 ft Channel Slope 0.87 % Critical Slope 2.11 % stream sta. 13+86 (to overflow) 1/22/2015 9:17:40 PM Bentley Systems, Inc. Haestad Methods Solution CenterBentley FlowMaster V8i (SELECTseries 1) [08.11.01.03] 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 2of2Page Culvert Calculator Report 36" CMP (Sta. 13+40) Title: The Lakes at Valley West - Aajker flood limits n:\...\storm\aajker floodplain\culverts.cvm 01/22/15 09:20:13 PM Morrison Maierle Inc © Bentley Systems, Inc. Haestad Methods Solution Center Watertown, CT 06795 USA +1-203-755-1666 Project Engineer: mhickman CulvertMaster v3.3 [03.03.00.04] Page 1 of 1 Solve For: Discharge Culvert Summary Allowable HW Elevation 59.00 ft Headwater Depth/Height 0.77 Computed Headwater Elevation 59.00 ft Discharge 20.45 cfs Inlet Control HW Elev. 58.76 ft Tailwater Elevation 57.20 ft Outlet Control HW Elev. 59.00 ft Control Type Entrance Control Grades Upstream Invert 56.70 ft Downstream Invert 56.28 ft Length 25.00 ft Constructed Slope 1.68 % Hydraulic Profile Profile S2 Depth, Downstream 1.39 ft Slope Type Steep Normal Depth 1.39 ft Flow Regime Supercritical Critical Depth 1.45 ft Velocity Downstream 6.40 ft/s Critical Slope 1.43 % Section Section Shape Circular Mannings Coefficient 0.024 Section Material CMP Span 3.00 ft Section Size 36 inch Rise 3.00 ft Number Sections 1 Outlet Control Properties Outlet Control HW Elev. 59.00 ft Upstream Velocity Head 0.57 ft Ke 0.50 Entrance Loss 0.28 ft Inlet Control Properties Inlet Control HW Elev. 58.76 ft Flow Control N/A Inlet Type Headwall Area Full 7.1 ft² K 0.00780 HDS 5 Chart 2 M 2.00000 HDS 5 Scale 1 C 0.03790 Equation Form 1 Y 0.69000 Project Description Friction Method Manning Formula Solve For Normal Depth Input Data Roughness Coefficient 0.035 Channel Slope 3.33 % Left Side Slope 3.00 ft/ft (H:V) Right Side Slope 3.00 ft/ft (H:V) Bottom Width 2.00 ft Discharge 20.45 ft³/s Results Normal Depth 0.87 ft Flow Area 4.01 ft² Wetted Perimeter 7.50 ft Hydraulic Radius 0.53 ft Top Width 7.22 ft Critical Depth 0.96 ft Critical Slope 2.23 % Velocity 5.10 ft/s Velocity Head 0.40 ft Specific Energy 1.27 ft Froude Number 1.21 Flow Type Supercritical GVF Input Data Downstream Depth 0.00 ft Length 0.00 ft Number Of Steps 0 GVF Output Data Upstream Depth 0.00 ft Profile Description Profile Headloss 0.00 ft Downstream Velocity Infinity ft/s Upstream Velocity Infinity ft/s Normal Depth 0.87 ft Critical Depth 0.96 ft Channel Slope 3.33 % 36" TW calc (Sta. 13+40) 1/22/2015 9:19:02 PM Bentley Systems, Inc. Haestad Methods Solution CenterBentley FlowMaster V8i (SELECTseries 1) [08.11.01.03] 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 2of1Page Project Description Friction Method Manning Formula Solve For Normal Depth Input Data Roughness Coefficient 0.035 Channel Slope 0.30 % Left Side Slope 3.00 ft/ft (H:V) Right Side Slope 3.00 ft/ft (H:V) Discharge 33.46 ft³/s Results Normal Depth 2.17 ft Flow Area 14.12 ft² Wetted Perimeter 13.72 ft Hydraulic Radius 1.03 ft Top Width 13.02 ft Critical Depth 1.51 ft Critical Slope 2.11 % Velocity 2.37 ft/s Velocity Head 0.09 ft Specific Energy 2.26 ft Froude Number 0.40 Flow Type Subcritical GVF Input Data Downstream Depth 0.00 ft Length 0.00 ft Number Of Steps 0 GVF Output Data Upstream Depth 0.00 ft Profile Description Profile Headloss 0.00 ft Downstream Velocity Infinity ft/s Upstream Velocity Infinity ft/s Normal Depth 2.17 ft Critical Depth 1.51 ft Channel Slope 0.30 % Critical Slope 2.11 % South Cutoff Ditch (100-yr) 1/22/2015 9:21:32 PM Bentley Systems, Inc. Haestad Methods Solution CenterBentley FlowMaster V8i (SELECTseries 1) [08.11.01.03] 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 1of1Page Project Description Friction Method Manning Formula Solve For Normal Depth Input Data Roughness Coefficient 0.035 Channel Slope 0.30 % Normal Depth 2.17 ft Left Side Slope 3.00 ft/ft (H:V) Right Side Slope 3.00 ft/ft (H:V) Discharge 33.46 ft³/s Cross Section Image South Cutoff Ditch (100-yr) 1/22/2015 9:22:05 PM Bentley Systems, Inc. Haestad Methods Solution CenterBentley FlowMaster V8i (SELECTseries 1) [08.11.01.03] 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 1of1Page 100-YEAR FLOODPLAIN DELINEATION CROSS-SECTION CALCULATIONS (this page left blank intentionally) Project Description Friction Method Manning Formula Solve For Normal Depth Input Data Channel Slope 1.16 % Discharge 37.91 ft³/s Section Definitions Station (ft)Elevation (ft) 0+00.0 43.27 0+09.2 42.91 0+13.4 42.68 0+20.4 41.33 0+22.8 42.86 0+30.1 43.74 0+58.7 43.39 0+63.7 45.00 Roughness Segment Definitions Start Station Ending Station Roughness Coefficient (0+00.0, 43.27) (0+63.7, 45.00)0.035 Options Current Roughness Weighted Method Pavlovskii's Method Open Channel Weighting Method Pavlovskii's Method Closed Channel Weighting Method Pavlovskii's Method Results Normal Depth 1.77 ft Elevation Range 41.33 to 45.00 ft Flow Area 12.02 ft² Wetted Perimeter 20.98 ft Hydraulic Radius 0.57 ft stream sta. 0+29 1/22/2015 4:04:44 PM Bentley Systems, Inc. Haestad Methods Solution CenterBentley FlowMaster V8i (SELECTseries 1) [08.11.01.03] 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 2of1Page Results Top Width 20.38 ft Normal Depth 1.77 ft Critical Depth 1.55 ft Critical Slope 2.20 % Velocity 3.15 ft/s Velocity Head 0.15 ft Specific Energy 1.92 ft Froude Number 0.72 Flow Type Subcritical GVF Input Data Downstream Depth 0.00 ft Length 0.00 ft Number Of Steps 0 GVF Output Data Upstream Depth 0.00 ft Profile Description Profile Headloss 0.00 ft Downstream Velocity Infinity ft/s Upstream Velocity Infinity ft/s Normal Depth 1.77 ft Critical Depth 1.55 ft Channel Slope 1.16 % Critical Slope 2.20 % stream sta. 0+29 1/22/2015 4:04:44 PM Bentley Systems, Inc. Haestad Methods Solution CenterBentley FlowMaster V8i (SELECTseries 1) [08.11.01.03] 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 2of2Page Project Description Friction Method Manning Formula Solve For Normal Depth Input Data Channel Slope 1.16 % Normal Depth 1.77 ft Discharge 37.91 ft³/s Cross Section Image stream sta. 0+29 1/22/2015 4:05:30 PM Bentley Systems, Inc. Haestad Methods Solution CenterBentley FlowMaster V8i (SELECTseries 1) [08.11.01.03] 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 1of1Page Project Description Friction Method Manning Formula Solve For Normal Depth Input Data Channel Slope 0.91 % Discharge 37.91 ft³/s Section Definitions Station (ft)Elevation (ft) 0+00.0 43.79 0+15.0 42.81 0+18.0 42.21 0+20.5 43.22 0+24.6 44.08 0+44.7 44.02 0+54.0 46.00 Roughness Segment Definitions Start Station Ending Station Roughness Coefficient (0+00.0, 43.79) (0+54.0, 46.00)0.035 Options Current Roughness Weighted Method Pavlovskii's Method Open Channel Weighting Method Pavlovskii's Method Closed Channel Weighting Method Pavlovskii's Method Results Normal Depth 1.52 ft Elevation Range 42.21 to 46.00 ft Flow Area 13.25 ft² Wetted Perimeter 22.31 ft Hydraulic Radius 0.59 ft Top Width 21.97 ft stream sta. 1+38 1/22/2015 4:06:00 PM Bentley Systems, Inc. Haestad Methods Solution CenterBentley FlowMaster V8i (SELECTseries 1) [08.11.01.03] 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 2of1Page Results Normal Depth 1.52 ft Critical Depth 1.32 ft Critical Slope 2.28 % Velocity 2.86 ft/s Velocity Head 0.13 ft Specific Energy 1.65 ft Froude Number 0.65 Flow Type Subcritical GVF Input Data Downstream Depth 0.00 ft Length 0.00 ft Number Of Steps 0 GVF Output Data Upstream Depth 0.00 ft Profile Description Profile Headloss 0.00 ft Downstream Velocity Infinity ft/s Upstream Velocity Infinity ft/s Normal Depth 1.52 ft Critical Depth 1.32 ft Channel Slope 0.91 % Critical Slope 2.28 % stream sta. 1+38 1/22/2015 4:06:00 PM Bentley Systems, Inc. Haestad Methods Solution CenterBentley FlowMaster V8i (SELECTseries 1) [08.11.01.03] 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 2of2Page Project Description Friction Method Manning Formula Solve For Normal Depth Input Data Channel Slope 0.91 % Normal Depth 1.52 ft Discharge 37.91 ft³/s Cross Section Image stream sta. 1+38 1/22/2015 4:06:28 PM Bentley Systems, Inc. Haestad Methods Solution CenterBentley FlowMaster V8i (SELECTseries 1) [08.11.01.03] 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 1of1Page Project Description Friction Method Manning Formula Solve For Normal Depth Input Data Channel Slope 0.58 % Discharge 37.91 ft³/s Section Definitions Station (ft)Elevation (ft) 0+00.0 45.97 0+05.3 44.84 0+08.3 43.92 0+14.9 44.69 0+35.8 45.92 0+42.7 46.06 0+50.8 48.00 Roughness Segment Definitions Start Station Ending Station Roughness Coefficient (0+00.0, 45.97) (0+50.8, 48.00)0.035 Options Current Roughness Weighted Method Pavlovskii's Method Open Channel Weighting Method Pavlovskii's Method Closed Channel Weighting Method Pavlovskii's Method Results Normal Depth 1.50 ft Elevation Range 43.92 to 48.00 ft Flow Area 15.89 ft² Wetted Perimeter 25.07 ft Hydraulic Radius 0.63 ft Top Width 24.81 ft stream sta. 3+15 1/22/2015 4:06:56 PM Bentley Systems, Inc. Haestad Methods Solution CenterBentley FlowMaster V8i (SELECTseries 1) [08.11.01.03] 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 2of1Page Results Normal Depth 1.50 ft Critical Depth 1.20 ft Critical Slope 2.27 % Velocity 2.39 ft/s Velocity Head 0.09 ft Specific Energy 1.59 ft Froude Number 0.53 Flow Type Subcritical GVF Input Data Downstream Depth 0.00 ft Length 0.00 ft Number Of Steps 0 GVF Output Data Upstream Depth 0.00 ft Profile Description Profile Headloss 0.00 ft Downstream Velocity Infinity ft/s Upstream Velocity Infinity ft/s Normal Depth 1.50 ft Critical Depth 1.20 ft Channel Slope 0.58 % Critical Slope 2.27 % stream sta. 3+15 1/22/2015 4:06:56 PM Bentley Systems, Inc. Haestad Methods Solution CenterBentley FlowMaster V8i (SELECTseries 1) [08.11.01.03] 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 2of2Page Project Description Friction Method Manning Formula Solve For Normal Depth Input Data Channel Slope 0.58 % Normal Depth 1.50 ft Discharge 37.91 ft³/s Cross Section Image stream sta. 3+15 1/22/2015 4:07:27 PM Bentley Systems, Inc. Haestad Methods Solution CenterBentley FlowMaster V8i (SELECTseries 1) [08.11.01.03] 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 1of1Page Project Description Friction Method Manning Formula Solve For Normal Depth Input Data Channel Slope 1.60 % Discharge 37.91 ft³/s Section Definitions Station (ft)Elevation (ft) 0+00.0 48.58 0+07.2 47.16 0+10.0 45.84 0+15.2 47.01 0+20.0 48.76 0+40.1 48.45 0+50.0 48.34 0+57.5 50.00 Roughness Segment Definitions Start Station Ending Station Roughness Coefficient (0+00.0, 48.58) (0+57.5, 50.00)0.035 Options Current Roughness Weighted Method Pavlovskii's Method Open Channel Weighting Method Pavlovskii's Method Closed Channel Weighting Method Pavlovskii's Method Results Normal Depth 1.61 ft Elevation Range 45.84 to 50.00 ft Flow Area 8.50 ft² Wetted Perimeter 11.23 ft Hydraulic Radius 0.76 ft stream sta. 5+36 1/22/2015 4:07:59 PM Bentley Systems, Inc. Haestad Methods Solution CenterBentley FlowMaster V8i (SELECTseries 1) [08.11.01.03] 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 2of1Page Results Top Width 10.70 ft Normal Depth 1.61 ft Critical Depth 1.53 ft Critical Slope 2.09 % Velocity 4.46 ft/s Velocity Head 0.31 ft Specific Energy 1.92 ft Froude Number 0.88 Flow Type Subcritical GVF Input Data Downstream Depth 0.00 ft Length 0.00 ft Number Of Steps 0 GVF Output Data Upstream Depth 0.00 ft Profile Description Profile Headloss 0.00 ft Downstream Velocity Infinity ft/s Upstream Velocity Infinity ft/s Normal Depth 1.61 ft Critical Depth 1.53 ft Channel Slope 1.60 % Critical Slope 2.09 % stream sta. 5+36 1/22/2015 4:07:59 PM Bentley Systems, Inc. Haestad Methods Solution CenterBentley FlowMaster V8i (SELECTseries 1) [08.11.01.03] 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 2of2Page Project Description Friction Method Manning Formula Solve For Normal Depth Input Data Channel Slope 1.60 % Normal Depth 1.61 ft Discharge 37.91 ft³/s Cross Section Image stream sta. 5+36 1/22/2015 4:11:21 PM Bentley Systems, Inc. Haestad Methods Solution CenterBentley FlowMaster V8i (SELECTseries 1) [08.11.01.03] 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 1of1Page Project Description Friction Method Manning Formula Solve For Normal Depth Input Data Channel Slope 1.37 % Discharge 37.91 ft³/s Section Definitions Station (ft)Elevation (ft) 0+00.0 49.40 0+07.0 47.14 0+11.6 46.79 0+14.2 47.91 0+35.6 49.57 0+43.1 49.45 0+58.1 49.24 0+73.1 49.20 Roughness Segment Definitions Start Station Ending Station Roughness Coefficient (0+00.0, 49.40) (0+73.1, 49.20)0.035 Options Current Roughness Weighted Method Pavlovskii's Method Open Channel Weighting Method Pavlovskii's Method Closed Channel Weighting Method Pavlovskii's Method Results Normal Depth 1.38 ft Elevation Range 46.79 to 49.57 ft Flow Area 9.78 ft² Wetted Perimeter 14.19 ft Hydraulic Radius 0.69 ft stream sta. 6+09 1/22/2015 4:11:53 PM Bentley Systems, Inc. Haestad Methods Solution CenterBentley FlowMaster V8i (SELECTseries 1) [08.11.01.03] 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 2of1Page Results Top Width 13.77 ft Normal Depth 1.38 ft Critical Depth 1.24 ft Critical Slope 2.11 % Velocity 3.88 ft/s Velocity Head 0.23 ft Specific Energy 1.62 ft Froude Number 0.81 Flow Type Subcritical GVF Input Data Downstream Depth 0.00 ft Length 0.00 ft Number Of Steps 0 GVF Output Data Upstream Depth 0.00 ft Profile Description Profile Headloss 0.00 ft Downstream Velocity Infinity ft/s Upstream Velocity Infinity ft/s Normal Depth 1.38 ft Critical Depth 1.24 ft Channel Slope 1.37 % Critical Slope 2.11 % stream sta. 6+09 1/22/2015 4:11:53 PM Bentley Systems, Inc. Haestad Methods Solution CenterBentley FlowMaster V8i (SELECTseries 1) [08.11.01.03] 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 2of2Page Project Description Friction Method Manning Formula Solve For Normal Depth Input Data Channel Slope 1.37 % Normal Depth 1.38 ft Discharge 37.91 ft³/s Cross Section Image stream sta. 6+09 1/22/2015 4:12:23 PM Bentley Systems, Inc. Haestad Methods Solution CenterBentley FlowMaster V8i (SELECTseries 1) [08.11.01.03] 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 1of1Page Project Description Friction Method Manning Formula Solve For Normal Depth Input Data Channel Slope 1.27 % Discharge 37.91 ft³/s Section Definitions Station (ft)Elevation (ft) 0+00.0 52.85 0+03.3 50.68 0+09.0 49.92 0+13.4 51.30 0+17.5 52.55 0+36.2 52.86 0+44.2 52.84 0+59.6 52.76 0+75.0 52.72 Roughness Segment Definitions Start Station Ending Station Roughness Coefficient (0+00.0, 52.85) (0+75.0, 52.72)0.035 Options Current Roughness Weighted Method Pavlovskii's Method Open Channel Weighting Method Pavlovskii's Method Closed Channel Weighting Method Pavlovskii's Method Results Normal Depth 1.40 ft Elevation Range 49.92 to 52.86 ft Flow Area 9.22 ft² Wetted Perimeter 11.58 ft stream sta. 8+49 1/22/2015 4:12:52 PM Bentley Systems, Inc. Haestad Methods Solution CenterBentley FlowMaster V8i (SELECTseries 1) [08.11.01.03] 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 2of1Page Results Hydraulic Radius 0.80 ft Top Width 11.13 ft Normal Depth 1.40 ft Critical Depth 1.26 ft Critical Slope 2.07 % Velocity 4.11 ft/s Velocity Head 0.26 ft Specific Energy 1.66 ft Froude Number 0.80 Flow Type Subcritical GVF Input Data Downstream Depth 0.00 ft Length 0.00 ft Number Of Steps 0 GVF Output Data Upstream Depth 0.00 ft Profile Description Profile Headloss 0.00 ft Downstream Velocity Infinity ft/s Upstream Velocity Infinity ft/s Normal Depth 1.40 ft Critical Depth 1.26 ft Channel Slope 1.27 % Critical Slope 2.07 % stream sta. 8+49 1/22/2015 4:12:52 PM Bentley Systems, Inc. Haestad Methods Solution CenterBentley FlowMaster V8i (SELECTseries 1) [08.11.01.03] 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 2of2Page Project Description Friction Method Manning Formula Solve For Normal Depth Input Data Channel Slope 1.27 % Normal Depth 1.40 ft Discharge 37.91 ft³/s Cross Section Image stream sta. 8+49 1/22/2015 4:13:17 PM Bentley Systems, Inc. Haestad Methods Solution CenterBentley FlowMaster V8i (SELECTseries 1) [08.11.01.03] 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 1of1Page Project Description Friction Method Manning Formula Solve For Normal Depth Input Data Channel Slope 1.26 % Discharge 37.91 ft³/s Section Definitions Station (ft)Elevation (ft) 0+00.0 56.73 0+12.5 54.10 0+15.0 53.41 0+17.3 54.95 0+21.2 55.93 0+41.0 55.95 0+53.0 55.74 0+68.6 55.74 0+84.6 55.72 Roughness Segment Definitions Start Station Ending Station Roughness Coefficient (0+00.0, 56.73) (0+84.6, 55.72)0.035 Options Current Roughness Weighted Method Pavlovskii's Method Open Channel Weighting Method Pavlovskii's Method Closed Channel Weighting Method Pavlovskii's Method Results Normal Depth 1.83 ft Elevation Range 53.41 to 56.73 ft Flow Area 9.40 ft² Wetted Perimeter 12.09 ft stream sta. 11+26 1/22/2015 4:02:41 PM Bentley Systems, Inc. Haestad Methods Solution CenterBentley FlowMaster V8i (SELECTseries 1) [08.11.01.03] 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 2of1Page Results Hydraulic Radius 0.78 ft Top Width 11.37 ft Normal Depth 1.83 ft Critical Depth 1.66 ft Critical Slope 2.13 % Velocity 4.03 ft/s Velocity Head 0.25 ft Specific Energy 2.08 ft Froude Number 0.78 Flow Type Subcritical GVF Input Data Downstream Depth 0.00 ft Length 0.00 ft Number Of Steps 0 GVF Output Data Upstream Depth 0.00 ft Profile Description Profile Headloss 0.00 ft Downstream Velocity Infinity ft/s Upstream Velocity Infinity ft/s Normal Depth 1.83 ft Critical Depth 1.66 ft Channel Slope 1.26 % Critical Slope 2.13 % stream sta. 11+26 1/22/2015 4:02:41 PM Bentley Systems, Inc. Haestad Methods Solution CenterBentley FlowMaster V8i (SELECTseries 1) [08.11.01.03] 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 2of2Page Project Description Friction Method Manning Formula Solve For Normal Depth Input Data Channel Slope 1.26 % Normal Depth 1.83 ft Discharge 37.91 ft³/s Cross Section Image stream sta. 11+26 1/22/2015 4:03:58 PM Bentley Systems, Inc. Haestad Methods Solution CenterBentley FlowMaster V8i (SELECTseries 1) [08.11.01.03] 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 1of1Page Project Description Friction Method Manning Formula Solve For Normal Depth Input Data Channel Slope 2.43 % Discharge 37.91 ft³/s Section Definitions Station (ft)Elevation (ft) 0+00.0 58.28 0+32.5 57.89 0+44.4 56.52 0+47.1 55.76 0+49.7 56.86 0+69.7 58.44 0+88.1 58.58 0+93.5 58.55 1+08.0 58.56 Roughness Segment Definitions Start Station Ending Station Roughness Coefficient (0+00.0, 58.28) (1+08.0, 58.56)0.035 Options Current Roughness Weighted Method Pavlovskii's Method Open Channel Weighting Method Pavlovskii's Method Closed Channel Weighting Method Pavlovskii's Method Results Normal Depth 1.50 ft Elevation Range 55.76 to 58.58 ft Flow Area 8.89 ft² Wetted Perimeter 17.18 ft stream sta. 13+11 1/22/2015 4:14:07 PM Bentley Systems, Inc. Haestad Methods Solution CenterBentley FlowMaster V8i (SELECTseries 1) [08.11.01.03] 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 2of1Page Results Hydraulic Radius 0.52 ft Top Width 16.80 ft Normal Depth 1.50 ft Critical Depth 1.52 ft Critical Slope 2.27 % Velocity 4.26 ft/s Velocity Head 0.28 ft Specific Energy 1.78 ft Froude Number 1.03 Flow Type Supercritical GVF Input Data Downstream Depth 0.00 ft Length 0.00 ft Number Of Steps 0 GVF Output Data Upstream Depth 0.00 ft Profile Description Profile Headloss 0.00 ft Downstream Velocity Infinity ft/s Upstream Velocity Infinity ft/s Normal Depth 1.50 ft Critical Depth 1.52 ft Channel Slope 2.43 % Critical Slope 2.27 % stream sta. 13+11 1/22/2015 4:14:07 PM Bentley Systems, Inc. Haestad Methods Solution CenterBentley FlowMaster V8i (SELECTseries 1) [08.11.01.03] 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 2of2Page Project Description Friction Method Manning Formula Solve For Normal Depth Input Data Channel Slope 2.43 % Normal Depth 1.50 ft Discharge 37.91 ft³/s Cross Section Image stream sta. 13+11 1/22/2015 4:14:46 PM Bentley Systems, Inc. Haestad Methods Solution CenterBentley FlowMaster V8i (SELECTseries 1) [08.11.01.03] 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 1of1Page Project Description Friction Method Manning Formula Solve For Normal Depth Input Data Channel Slope 0.87 % Discharge 37.91 ft³/s Section Definitions Station (ft)Elevation (ft) 0+00.0 59.21 0+43.7 59.17 0+48.0 58.23 0+49.1 56.86 0+52.5 56.94 0+55.7 56.99 0+57.0 58.70 0+64.4 59.20 0+66.8 59.33 1+02.6 59.10 Roughness Segment Definitions Start Station Ending Station Roughness Coefficient (0+00.0, 59.21) (1+02.6, 59.10)0.035 Options Current Roughness Weighted Method Pavlovskii's Method Open Channel Weighting Method Pavlovskii's Method Closed Channel Weighting Method Pavlovskii's Method Results Normal Depth 1.34 ft Elevation Range 56.86 to 59.33 ft Flow Area 9.68 ft² stream sta. 13+86 1/22/2015 4:15:25 PM Bentley Systems, Inc. Haestad Methods Solution CenterBentley FlowMaster V8i (SELECTseries 1) [08.11.01.03] 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 2of1Page Results Wetted Perimeter 9.85 ft Hydraulic Radius 0.98 ft Top Width 8.60 ft Normal Depth 1.34 ft Critical Depth 1.04 ft Critical Slope 2.16 % Velocity 3.92 ft/s Velocity Head 0.24 ft Specific Energy 1.58 ft Froude Number 0.65 Flow Type Subcritical GVF Input Data Downstream Depth 0.00 ft Length 0.00 ft Number Of Steps 0 GVF Output Data Upstream Depth 0.00 ft Profile Description Profile Headloss 0.00 ft Downstream Velocity Infinity ft/s Upstream Velocity Infinity ft/s Normal Depth 1.34 ft Critical Depth 1.04 ft Channel Slope 0.87 % Critical Slope 2.16 % stream sta. 13+86 1/22/2015 4:15:25 PM Bentley Systems, Inc. Haestad Methods Solution CenterBentley FlowMaster V8i (SELECTseries 1) [08.11.01.03] 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 2of2Page Project Description Friction Method Manning Formula Solve For Normal Depth Input Data Channel Slope 0.87 % Normal Depth 1.34 ft Discharge 37.91 ft³/s Cross Section Image stream sta. 13+86 1/22/2015 4:15:47 PM Bentley Systems, Inc. Haestad Methods Solution CenterBentley FlowMaster V8i (SELECTseries 1) [08.11.01.03] 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 1of1Page Project Description Friction Method Manning Formula Solve For Normal Depth Input Data Channel Slope 0.73 % Discharge 37.91 ft³/s Section Definitions Station (ft)Elevation (ft) 0+00.0 59.95 0+45.7 59.94 0+49.0 58.69 0+49.7 57.63 0+54.5 57.77 0+57.3 57.82 0+58.5 59.08 0+61.6 59.87 0+65.2 60.20 1+01.7 60.02 Roughness Segment Definitions Start Station Ending Station Roughness Coefficient (0+00.0, 59.95) (1+01.7, 60.02)0.035 Options Current Roughness Weighted Method Pavlovskii's Method Open Channel Weighting Method Pavlovskii's Method Closed Channel Weighting Method Pavlovskii's Method Results Normal Depth 1.35 ft Elevation Range 57.63 to 60.20 ft Flow Area 10.78 ft² stream sta. 14+59 1/22/2015 4:16:25 PM Bentley Systems, Inc. Haestad Methods Solution CenterBentley FlowMaster V8i (SELECTseries 1) [08.11.01.03] 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 2of1Page Results Wetted Perimeter 11.29 ft Hydraulic Radius 0.95 ft Top Width 10.17 ft Normal Depth 1.35 ft Critical Depth 0.99 ft Critical Slope 2.16 % Velocity 3.52 ft/s Velocity Head 0.19 ft Specific Energy 1.54 ft Froude Number 0.60 Flow Type Subcritical GVF Input Data Downstream Depth 0.00 ft Length 0.00 ft Number Of Steps 0 GVF Output Data Upstream Depth 0.00 ft Profile Description Profile Headloss 0.00 ft Downstream Velocity Infinity ft/s Upstream Velocity Infinity ft/s Normal Depth 1.35 ft Critical Depth 0.99 ft Channel Slope 0.73 % Critical Slope 2.16 % stream sta. 14+59 1/22/2015 4:16:25 PM Bentley Systems, Inc. Haestad Methods Solution CenterBentley FlowMaster V8i (SELECTseries 1) [08.11.01.03] 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 2of2Page Project Description Friction Method Manning Formula Solve For Normal Depth Input Data Channel Slope 0.73 % Normal Depth 1.35 ft Discharge 37.91 ft³/s Cross Section Image stream sta. 14+59 1/22/2015 4:16:51 PM Bentley Systems, Inc. Haestad Methods Solution CenterBentley FlowMaster V8i (SELECTseries 1) [08.11.01.03] 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 1of1Page