Hydraulic Report. County Road 595 Bridge over Yellow Dog River. Prepared By AECOM Brian A. Hintsala, P.E
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1 Prepared for: Prepared by: Marquette County Road Commission AECOM Ishpeming, MI Marquette, MI December 9, 2011 Hydraulic Report County Road 595 Bridge over Yellow Dog River Prepared By AECOM Brian A. Hintsala, P.E
2 AECOM i Contents 1.0 Introduction Method of Analysis Variables and Coefficients Starting Point Discussion Conclusion... 2 List of Appendices Appendix A HEC-RAS Computations Appendix B Profile Sheets Appendix C Topographic Map HEC-RAS River Sections Appendix D Bridge Plans Appendix E Cross Sections Appendix F Damage Waivers Appendix G Flow Rates Appendix H Site Photographs Appendix I USGS Topographical Map and River Gradient Calculations
3 AECOM Introduction This hydraulic report is being prepared for the Marquette County Road Commission concerning the proposed County Road 595 crossing of the Yellow Dog River. The site is located in Section 13 of T50N, R29W, Quad Map Name Silver Lake Basin (Lat /Long ) in Michigamme Township, Marquette County. Multiple road alignments were investigated. The chosen alignment crosses the river at the site of an existing bridge. The existing bridge, however, is both structurally and geometrically inadequate for the projected road traffic and requires replacement. 2.0 Method of Analysis The hydraulic analysis was performed using the HEC-RAS River Analysis System computer program, Version developed by the U.S. Army Corps of Engineers Hydraulic Engineering Center. The steady flow data for the flood events were obtained from the Michigan Department of Environmental Quality (MDEQ). Flood flow events with reoccurrence intervals up to 500 years were modeled and checked against the low chord elevation of the bridge. 3.0 Variables and Coefficients The river sections near the bridge use an expansion coefficient of 0.30 and contraction coefficient of 0.50 which are suitable for a typical bridge per Table 3.3 of the HEC-RAS Hydraulic Reference Manual. The Manning s n-values for friction loss were selected using Table 3.1 of the HEC-RAS Hydraulic Reference Manual. The main channel is fairly uniform with some weeds and rocks so a value of was chosen. The overbanks are swampy areas covered with heavy brush so a value of was chosen. Representative photographs of the site are included in Appendix H. 4.0 Starting Point The starting point of the analysis was a surveyed river section about 2140 feet downstream of the proposed road. This location was chosen because it was far enough downstream to be outside of the influence of the proposed bridge. The starting water surface elevation was calculated by HEC-RAS using the slope-conveyance method. An average channel slope of was estimated from a USGS quadrangle map and used for the normal depth boundary condition. The calculations are included in Appendix I. 5.0 Discussion The main channel of the Yellow Dog River is well defined and at the 10-year flood event conveys the bulk of the flow. At the 100-year flood event the main channel generally conveys more than 70% of the flow with the rest being carried by the overbank floodplains. The river gradient is relatively flat and the flow regime is sub-critical for all flood events. The existing bridge has a 12 foot wide timber deck supported by steel beams which span 40 feet. There are no abutments with the bridge founded directly on the river banks. The banks have been built-up to raise the bridge and have some stone riprap protecting the front slopes. The built-up banks
4 AECOM 2 form an artificial constriction on the original channel and will be removed as part of the proposed bridge project. This is indicated on the bridge plans in Appendix D. The proposed bridge includes a pre-cast concrete beam super structure with a span of 55 feet. The box beams will be placed directly adjacent to each other and also form the bridge deck. The concrete abutments are supported by driven steel piles. The restored stream banks will be protected with heavy riprap which is sized and placed in accordance with the Michigan Department of Transportation 2003 Standard Specifications for Construction. The proposed bridge will be placed directly over the location of the existing bridge (after is removed). The river cross sections are placed in HEC-RAS at the distances measured along the center line of the channel. In some cases the surveyed sections on each side of the bridge were adjusted up or downstream as required to model the bridge using the standard bridge/culvert input section of HEC- RAS. This is required because the actual location of the bridge was not known when the survey was performed. The final positions of the sections are shown in the plan view in Appendix C. The proposed road approach on the right side of the bridge cuts off a portion of the overbank flow during the higher flow events. Ineffective flow areas were included in the right overbank portions of the cross sections upstream and downstream of the bridge as suggested in chapter 5 of the HEC- RAS Hydraulic Reference Manual. The left overbank near the bridge is higher than all the flood water elevations, so ineffective flow areas were not required on the left side. Ineffective flow areas were not used for the existing condition because the existing road is relatively low and there is potential for overbank flow. Since the existing bridge encroaches on the main channel, the proposed bridge has a larger span. This reduces the water velocity and upstream water elevation for the proposed bridge. Table 1 on the following page summarizes the key model results for two configurations: 1. The existing 40 span bridge. 2. The proposed 55 span bridge. 6.0 Conclusion Analysis results indicate that the proposed bridge decreases water surface elevations and channel velocities for all of the flow events compared to the existing bridge.
5 Hydraulic Comparison of Various Bridge Options 3 County Road 595 Bridge Design Yellow Dog River 4/3/2010 Table 1 HEC-RAS Analysis Results Velocity in Channel at Bridge River Station 4.5 Flow thru Bridge Water Surface Elevation at Upstream Face of Bridge River Station 5 Energy Gradient Elev at Upstream Face of Bridge River Station 5 Energy Gradient Elevation at 1560' Upstream of Bridge River Station 9 (ft/sec) (cfs) (feet) (feet) (feet) Model Configuration 100 Year 10 Year 100 Year 100 Year 500 Year 100 Year 100 Year (600 cfs) (170 cfs) (600 cfs) (600 cfs) (1100 cfs) (600 cfs) Change (600 cfs) Change Existing Bridge Proposed Bridge
6 AECOM Appendix A HEC-RAS Computations
7 AECOM Computations The HEC-RAS data files are included in a separate electronic folder named: HEC-RAS_Yellow Dog.zip In order to provide a brief summary of the analysis results, a Profile Output Table for the existing and proposed conditions are included on the following pages.
8 HEC-RAS Plan: Original Str River: Yellow Dog Reach: Yellow Dog Reach River Sta Profile Q Total Min Ch El W.S. Elev Crit W.S. E.G. Elev E.G. Slope Vel Chnl Flow Area Top Width Froude # Chl (cfs) (ft) (ft) (ft) (ft) (ft/ft) (ft/s) (sq ft) (ft) Yellow Dog 9 10 Year Yellow Dog 9 50 Year Yellow Dog Year Yellow Dog Year Yellow Dog 8 10 Year Yellow Dog 8 50 Year Yellow Dog Year Yellow Dog Year Yellow Dog 7 10 Year Yellow Dog 7 50 Year Yellow Dog Year Yellow Dog Year Yellow Dog 6 10 Year Yellow Dog 6 50 Year Yellow Dog Year Yellow Dog Year Yellow Dog 5 10 Year Yellow Dog 5 50 Year Yellow Dog Year Yellow Dog Year Yellow Dog 4.5 BR U 10 Year Yellow Dog 4.5 BR U 50 Year Yellow Dog 4.5 BR U 100 Year Yellow Dog 4.5 BR U 500 Year Yellow Dog 4.5 BR D 10 Year Yellow Dog 4.5 BR D 50 Year Yellow Dog 4.5 BR D 100 Year Yellow Dog 4.5 BR D 500 Year Yellow Dog 4 10 Year Yellow Dog 4 50 Year Yellow Dog Year Yellow Dog Year Yellow Dog 3 10 Year Yellow Dog 3 50 Year Yellow Dog Year Yellow Dog Year Yellow Dog 2 10 Year Yellow Dog 2 50 Year Yellow Dog Year Yellow Dog Year Yellow Dog 1 10 Year Yellow Dog 1 50 Year Yellow Dog Year Yellow Dog Year
9 HEC-RAS Plan: 55 Br at 4.5 River: Yellow Dog Reach: Yellow Dog Reach River Sta Profile Q Total Min Ch El W.S. Elev Crit W.S. E.G. Elev E.G. Slope Vel Chnl Flow Area Top Width Froude # Chl (cfs) (ft) (ft) (ft) (ft) (ft/ft) (ft/s) (sq ft) (ft) Yellow Dog 9 10 Year Yellow Dog 9 50 Year Yellow Dog Year Yellow Dog Year Yellow Dog 8 10 Year Yellow Dog 8 50 Year Yellow Dog Year Yellow Dog Year Yellow Dog 7 10 Year Yellow Dog 7 50 Year Yellow Dog Year Yellow Dog Year Yellow Dog 6 10 Year Yellow Dog 6 50 Year Yellow Dog Year Yellow Dog Year Yellow Dog 5 10 Year Yellow Dog 5 50 Year Yellow Dog Year Yellow Dog Year Yellow Dog 4.5 BR U 10 Year Yellow Dog 4.5 BR U 50 Year Yellow Dog 4.5 BR U 100 Year Yellow Dog 4.5 BR U 500 Year Yellow Dog 4.5 BR D 10 Year Yellow Dog 4.5 BR D 50 Year Yellow Dog 4.5 BR D 100 Year Yellow Dog 4.5 BR D 500 Year Yellow Dog 4 10 Year Yellow Dog 4 50 Year Yellow Dog Year Yellow Dog Year Yellow Dog 3 10 Year Yellow Dog 3 50 Year Yellow Dog Year Yellow Dog Year Yellow Dog 2 10 Year Yellow Dog 2 50 Year Yellow Dog Year Yellow Dog Year Yellow Dog 1 10 Year Yellow Dog 1 50 Year Yellow Dog Year Yellow Dog Year
10 AECOM Appendix B Profile Sheets
11 Kennecott Eagle Mine - Yellow Dog Plan: Original Structure 4/3/2010 Yellow Dog Yellow Dog Legend EG 500 Year WS 500 Year EG 100 Year WS 100 Year EG 50 Year WS 50 Year Crit 500 Year Crit 100 Year EG 10 Year WS 10 Year Elevation (ft) 1414 Crit 50 Year Crit 10 Year Ground Main Channel Distance (ft)
12 Kennecott Eagle Mine - Yellow Dog Plan: NEW BRDG 55 FT, Located over existing br 4/3/2010 Yellow Dog Yellow Dog Legend EG 500 Year WS 500 Year EG 100 Year WS 100 Year EG 50 Year WS 50 Year Crit 500 Year Crit 100 Year EG 10 Year WS 10 Year Elevation (ft) 1414 Crit 50 Year Crit 10 Year Ground Main Channel Distance (ft)
13 AECOM Appendix C Topographic Map HEC-RAS River Sections
14 Project Map Figure 1a Yellow Dog River Crossing November 21, 2007 Lake Superior Marquette Ishpeming Negaunee Symbol Legend Final Route Section Lines Stream Location Key Map (Marquette County, Michigan) 0 I 200 Page 1 of inch equals 400 feet
15 AECOM Appendix D Bridge Plans
16
17
18 AECOM Appendix E Cross Sections
19 AECOM Cross Section Cross sections are included for the existing condition and the proposed bridge condition.
20 AECOM Existing Channel Condition
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22
23
24
25
26
27
28
29
30
31 AECOM Proposed Bridge Condition
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33
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35
36
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39
40
41
42 AECOM Appendix F Damage Waivers
43 AECOM No Damage Waivers Required
44 AECOM Appendix G Flow Rates
45 DEQ - Flood Frequency Discharges Page 1 of 1 12/12/2011 Joint Permit Application DEQ Home CIWPIS Online Services Permits Programs Site Map Contact DEQ Flood Discharge Request Record /12/2011 Home Water Management Lowflows Discharge Requests Watersheds Map Discharge Information Watercourse: YELLOW DOG RIVER Location: Clowery Road Drainage Area: mi 2 Basin Name: 48L - Falls (Lake) Contributing Area: mi 2 County: Marquette Tn/Rng/Sec: 50N29W/13 Township: Michigamme Latitude: Quad Name: Silver Lake Basin Longitude: Quad ID: D11NE Requested By: Sheila Meier (DEQ-LWM- Received Date: 11/23/2011 Ishpeming) Request Type: Trans. - County Issued Date: 12/5/2011 File Number: Reference Number: Discharge Frequencies: Volume Frequencies: 10%: 170 cfs 2%: 420 cfs 1%: 600 cfs 1%: 2200 acre-ft 0.5%: 750 cfs 0.5%: 2800 acre-ft 0.2%: 1100 cfs Access to the Flood Flow Database is provided as a service to allow you to check the status of your flood flow requests or to view discharges from previous requests for preliminary design purposes. The discharges values are only valid for the original requestor and for one year after the original request date. To obtain discharge information from the Hydrologic Studies Program, a flood flow discharge request form may be submitted electronically to the DEQ. A written or response to your request will be returned to you and must accompany your permit application. Michigan.gov Home DEQ_Home Online Services Permits Programs Site Map Contact_DEQ State Web Sites Privacy Policy Link Policy Accessibility Policy Security Policy Copyright 2011 State of Michigan
46 AECOM Appendix H Photos
47 County Road 595 over the Yellow Dog River.DOC Existing Bridge Looking NE Looking Upstream from Existing Bridge
48 County Road 595 over the Yellow Dog River.DOC Looking Upstream from Existing Bridge Looking Upstream from Existing Bridge
49 County Road 595 over the Yellow Dog River.DOC Looking Downstream from Existing Bridge Looking Downstream from Existing Bridge
50 County Road 595 over the Yellow Dog River.DOC Existing Bridge Looking Downstream Approach to Existing Bridge
51 AECOM Appendix I USGS Topographical Map and River Gradient Calculations Map includes portions of Quadrangle maps: Bulldog Lake Silver Lake Basin
52 087 54' 0.00" W ' 0.00" W ' 0.00" W ' 0.00" W ' 0.00" N ' 0.00" N ' 0.00" N ' 0.00" N ' 0.00" N ' 0.00" N Proposed bridge location Yellow Dog River 5m Intv 5m diff =16.4' = 16.4/13,497'= or 0.12% W ' 0.00" W ' 0.00" W ' 0.00" W ' 0.00" W Copyright (C) 1999, Maptech, Inc.
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