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HomeMy WebLinkAboutStorm Sewer Assessment Report Storm Sewer System Assessment Port Burwell and Vienna Municipality of Bayham s ;iiii - - _.. _ ii '4 '''..":-t *` tom! ,-,447, 3:40:4•414,1; ' tier % ,, kV- Port Burwell Beach MERIT ECH 1315 Bishop Street North, Suite 202 Cambridge, ON N1R 6Z2 t 519.623.1140 f 519.623.7334 www.meritech.ca Project No.: 4423 1 M H _ IT EU " J L October 30, 2015 Municipality of Bayham 9344 Plank Road Stradfordville, ON NO] 1Y0 Attention: Mr. Paul Shipway CAO,. Municipality of Bayham Dear Mr. Shipway, Re: Existing Conditions and Recommendations Report Port Burwell and Vienna Storm Sewer Assessment Municipality of Bayham The following report has been prepared in accordance with the requirements of the Municipality of Bayham as set out in our proposal from March 2015. Over the spring and summer of 2015, Meritech conducted structure investigations, CCTV inspections and GPS survey of the storm structures to determine the extent of the existing storm sewer systems in Port Burwell and Vienna. From this information along with any existing drawings made available a map of the networks was produced. ± u w Recommendations based on the conclusions of this investigation are included herein to E guide the Municipality in a program to rehabilitate the storm sewer systems within Port w Burwell and Vienna. "n f ,:. ) S .. v c) _ q'. .y� ,_ .f C -0.,f, -\\ „z, ( Yours very truly, ' -S) A.J. FROESE 0,-,1 ‘i,, �� cu _ -- ��� �' ` 100044355 `'- MERITECH ENGINEERING --- , \\,\ 4 Cit Ai)- F of of o Jason Tulumello Amanda J. Froese, P.Eng., FEC Construction Inspector Project Manager ]CT/mb Enclosures (1) Fnognisnuelting ,��rers ,,r Professional Engineers MEV2014 Storm Sewer System Assessment y of Ontario Ontario Meritech En ineerin 1315 St. North Suite 202 Cambrid e ON N1R 6Z2 t 519.623.1140 f 519.623.7334 Engineering Bishop 9 MERIT ECH Storm Sewer System Assessment Executive Summary The storm water management systems in the villages of Vienna and Port Burwell consist of roadside swales, ravines, culverts, and storm pipes ranging in diameter and length. The runoff catchment areas consist of grassed areas, asphalt pavement roads, parking lots, and residential areas. The purpose of this report is to describe the existing conditions of the storm systems within the villages of Port Burwell and Vienna and what is required of the municipality to establish an effective storm water management system in accordance with the Ministry of the Environment guidelines or as directed by Public Works. The identification of existing conditions began with a site examination with multiple pictures and inspections of manhole structure conditions and locations, storm sewer invert elevations, catchment areas, and outlet locations. Following the site inspections spanning over a period of 2 weeks, CCTV inspections were coordinated and carried out at storm sewer locations believed to be significant due to large pipe diameters, unknown outlets, and to identify deficient storm pipes. The results of the inspections were compiled, correlated and analyzed for use in developing the storm water network in AutoCAD as well as in the storm sewer hydraulic design analysis. In both Port Burwell and Vienna many of the sewers are cracked, deformed, or plugged with sediment resulting in inefficient drainage systems. Many of the areas drain through private properties through swales/ditches and culverts and possibly without easement rights. It is our opinion that the Municipality is best served by having their infrastructure within their own right of ways and replacing deficient storm sewers and structures thereby reducing liability risk to the Municipality. Recommendations include characteristics for the future design of the systems, replacement strategies and next steps. K:Projects\4423\60-Design\4423.ExistingConditionsReport 10/30/2015 Page i MERIT ECH Storm Sewer System Assessment Disclaimer This Existing Conditions report was prepared by Meritech Engineering for the Municipality of Bayham. The comments, recommendations and materials presented in this report reflect our best judgement in light of the information available at the time of preparation. Except for approval and commenting municipalities and agencies in their review and approval of this project, any use which a third party makes of this report, or any reliance upon, or decisions as a result of, are the responsibility of such third parties. Meritech Engineering accepts no responsibility for damages suffered by any third party, other than an approval or commenting municipality or agency, as a result of decisions made or actions taken based on this report. Use and Reproduction of This Document No part of this report may be reproduced, stored in a retrieval system, or transcribed in any form, or by means including electronic, mechanical, photocopying, recording and scanning without the prior written approval of the author. For Further Information For further information regarding this report please contact the author at the following address: Meritech Engineering Attention: Mr. Ian S. Robertson, P. Eng. Director of Engineering 1315 Bishop Street North, Suite 202 Cambridge, ON N1R 6Z2 t (519) 623-1140 f (519) 623-7334 email: ianr@meritech.ca K:Projects\4423\60-Design\4423.ExistingConditionsReport 10/30/2015 Page ii MERIT E C H Storm Sewer System Assessment Table of Contents Introduction 1 Background 1 Purpose 2 Scope 2 Approach 2 Findings 4 Port Burwell 4 Network One 5 Network Two 5 Network Three 5 Network Four 5 Network Five 5 Network Six 6 Network Seven 6 Unknown Networks 6 Vienna 7 Network One 8 Network Two 8 Network Three 8 Network Four 8 Network Five 8 Network Six 9 Unknown Networks 9 Conclusions 9 Recommendations 10 References 11 List of Figures Figure 1: Municipality of Bayham. (image from Google Maps. October 26, 2015) 1 Figure 2: Port Burwell Networks Areas 4 Figure 3: Vienna Catchment Areas 7 Appendices Appendix A: Sewer Structure Dip Sheets Appendix B: Storm Network Drawings Appendix C: CCTV Reports K:Projects\4423\60-Design\4423.ExistingConditionsReport October 2015 Page iii MERIT E C H Storm Sewer System Assessment Introduction This section will introduce the villages of Vienna and Port Burwell, the purpose of the existing conditions assessment, and the main scope of the report. Background These two villages are located within the Municipality of Bayham which is part of Elgin County (see Figure 1). The storm drainage flows to Big Otter Creek, and eventually to Lake Erie. These villages are small in size and population with large lots and rural street sections. 'W. Q �Eden ©' Q Richmond � pf 9 SlratloedviIle T _ Capon aa, I Vienna ±i i 19 PVrt 131el1w+;:71 U } ffi '44ay. Pert Burwell Figure 1: Municipality of Bayham. (image from Google Maps. October 26, 2015) K:Projects\4423\60-Design\4423.Storm Sewer Assessment.rpt.docx October 2015 Page 1 MERIT E C H Storm Sewer System Assessment Purpose The Municipality of Bayham sought assistance in assessing the existing storm sewer conditions for Port Burwell and Vienna in order to determine whether remedial work was required to improve efficiency and reliability of the storm drainage systems. The Municipality also sought to improve up to date records of the storm systems in Vienna and Port Burwell. Drainage systems provide the Municipality with a method to reduce liability and risk of flooding. Rainfall and runoff from municipal right of ways are carried to adequate outlets along with drainage from private lands. It is important for the Municipality of Bayham to understand the system and to make informed decisions on its maintenance and configuration. Scope This report includes how the existing conditions were determined and how that information was used to provide appropriate conclusions and recommendations based on the need of the Municipality. The findings include catchment areas, storm water networks flowing to each outlet, deficient storm sewers and structures. It will also include conclusions gathered from these finding and recommendations on how to improve the existing storm water systems. Approach This section provides what was required in the assessment of existing conditions and the techniques used to gather that information. It also describes how that information was used to determine the effectiveness of the existing drainage systems. The assessment began with an inspection of each individual manhole and catchbasin structure and the sewers entering at each location. Sewers on County Roads were excluded from the assessment; though some local sewers discharge into County sewers. Each structure was inspected for type, size, shape, material, condition and opening locations for each storm sewer. Within each structure, each storm sewer was inspected for direction, size, material, visible conditions, and 'dips' (distance from the invert of the pipe to the top of the lid). The Structure Dip Sheets are included in Appendix A. Surveyors then visited the site to determine the location of each structure and the elevation at the centre of each lid using GPS technologies. This information was used together with the 'dips' to determine the invert elevations and slopes of each pipe. After the invert elevations and slopes were determined, the information was input into the AutoCAD file along with the surveyed structure locations to develop the network. This is to be provided to the Municipality for inclusion in the GIS system. In order to determine the sewer condition, direction and connectivity to the network, a video inspection was required. CCTV (Closed Camera Television) inspections were then coordinated at specific locations including sewers with diameters 300mm and larger and sewers with unknown inlets or outlets. In order to perform the CCTV inspections, flushing of K:Projects\4423\60-Design\4423.Storm Sewer Assessment.rpt.docx October 2015 Page 2 MERIT E C H Storm Sewer System Assessment the sewers was required to allow the camera to pass through the sewers. Unfortunately, the CCTV inspections could not be completed in many areas due to large debris, blockages (silt) or pipe deformation. Many assumptions were made while developing the network and many of the sewer inlets and outlets remain unknown. The cost to flush these unknown pipes in order to facilitate further CCTV is high; therefore flushing and additional CCTV inspections is not recommended as these pipes are already not working and are recommended to be replaced. The storm pipe sizes, types, and slopes were used together with the catchment areas and runoff coefficients to determine whether the pipes can perform under the 5 year storm flow conditions. This was determined using storm sewer hydraulic design calculations. This part of the project shall be built upon with a proposed condition system with the detailed design of future systems. This report will provide the municipality with a guiding document for future work for a drainage system in Vienna and Port Burwell. K:Projects\4423\60-Design\4423.Storm Sewer Assessment.rpt.docx October 2015 Page 3 MERIT ECH Storm Sewer System Assessment Findings This section will provide the catchment areas and describe the conditions of each individual network in Port Burwell and Vienna using the information gathered described in the 'Approach' Section. Port Burwell Port Burwell is comprised of seven separate drainage networks. These networks have been created based on outlets. They each have a separate outlet to Big Otter Creek, the County ' Min" 116.. Illr r Road or the beach. =, *Ipso: . MOM , dtilliiikii lir II iiIw 11 �� �.. P , a I -fir'i. Aii, mom mei a„ ■ Vi411wtJr II imu—,,, ,,sm .. -,=-_--F,..._ i't pi ,millr 1. A ImEM --11Mill #0 =it- *Ism 1-, simi Iii!„..,Lii I Bilipm• iei .:417 NE a 6 . 91 LE oni NE MB iv Po 1111At ■ .11 ..dir,M IL, Mmi BIEN in" 116. En • il , . ,. . , 1 _11 -21 M % .$,T Ohl il. 1 limmiLli r — p It . .. , a,,,,,, , 4 im i .t MERU MI Nril 1 NMI In IP..et am 1 'ii*Ilk IIIIIPri ' rri-111 ft Ir I INE . 1 ; 11167 migli 41 Figure 2: Port Burwell Networks Areas K:Projects\4423\60-Design\4423.Storm Sewer Assessment.rpt.docx October 2015 Page 4 MERITECH Storm Sewer System Assessment Network One Network One has an outlet to Lake Erie located south of Brock Street with the network comprised of manhole and catchbasin structures on Robinson Street. This network takes a total catchment area of approximately 3.25 hectares and also takes additional flow from a County road network north of Wellington Street (see Figure 2 — Green). This section contains approximately 510m of pipe with approximately 50% of the pipe lengths assumed due to blind pipes to the main as well as deformed pipes, blockages and debris that could not be inspected. Approximately 290m of pipe is cracked, deformed and damaged which makes up approximately 70% of the network. Network Two Network Two has an outlet to Big Otter Creek located west of the intersection of Pitt and Robinson Streets with the network comprised of catchbasin structures on Pitt, Brock, and Robinson Streets (see Figure 2 — Yellow). This network takes a total catchment area of approximately 3.5 hectares. This section contains approximately 600m of pipe with approximately 75% of the pipe lengths assumed due to blind pipes to the main as well as deformed pipes, blockages and debris that could not be inspected. Approximately 140m of pipe is deformed and damaged which makes up approximately 25% of the network. Network Three Network Three has an outlet to Lake Erie located south from the Memorial Park Drain Extension with the network comprised of manhole and catchbasin structures on Strachan Street (see Figure 2 — Blue). This network takes a total catchment area of approximately 8.5 hectares and also takes additional flow from a culvert near the intersection of Brock Street and Strachan Street. This section contains approximately 730m of pipe with approximately 30% of the pipe lengths assumed due to blind pipes to the main as well as deformed pipes, blockages and debris that could not be inspected. Also, this network contains a 600mm diameter pipe with an assumed length of approximately 210m which is greater than the distance of 90m between structures recommended by the Ministry of the Environment. Approximately 90m of pipe is deformed and damaged which makes up approximately 15% of the network. Network Four Network Four has an assumed outlet to a 450mm culvert south of Wellington Street, along Elizabeth Street, with the network comprised of catchbasin structures on Elizabeth Street (see Figure 2 — Orange). This network takes a total catchment area of approximately 1.6 hectares. This section contains approximately 300m of pipe with approximately 85% of the pipe lengths assumed due to blind pipes to the main as well as deformed pipes, blockages and debris that could not be inspected. Approximately 110m of pipe is deformed and damaged which makes up approximately 40% of the network. Network Five Network Five has an outlet to Lake Erie south of Pitt Street with the network comprised of catchbasin structures on Pitt Street between Elizabeth and Victoria Streets (see Figure 2 — Red). This network takes a total assumed catchment area of 2.9 hectares from an assumed swale behind the homes between Victoria and Elizabeth Streets. This section contains approximately 70m of pipe with approximately 60% of the pipe lengths assumed due to an K:Projects\4423\60-Design\4423.Storm Sewer Assessment.rpt.docx October 2015 Page 5 MERIT ECH Storm Sewer System Assessment assumed inlet. Approximately 10m of pipe is damaged due to a displaced and offset pipe toward the outlet. Network Six Network Six has an outlet to Big Otter Creek located northeast of the Strachan Street and Robinson Street intersection with the network comprised of catchbasin structures on Elizabeth, William, Victoria, Newton, Milton, Shakespeare, Strachan and Robinson Streets (see Figure 2 — Turquois). This network takes a total catchment area of approximately 12 hectares and is the largest single network in Port Burwell. This section contains approximately 1400m of pipe with approximately 40% of the pipe lengths assumed due to blind pipes to the main as well as deformed pipes, blockages and debris that could not be inspected. Also, this network contains a 450mm and 300mm diameter pipe with assumed lengths exceeding the distance of 90m between structures recommended by the Ministry of the Environment. Approximately 200m of pipe is deformed, damaged, or collapsed which makes up approximately 15% of the network. Network Seven Network Seven has an outlet to a ravine located southwest of Burwell Street with the network comprised of manhole and catchbasin structures on Homer, Cowper, Tennyson, and Addison Streets (see Figure 2 — Pink). This network takes a total catchment area of approximately 4.6 hectares. This section contains approximately 800m of pipe with approximately 25% of the pipe lengths assumed due to blind pipes to the main as well as deformed pipes, blockages and debris that could not be inspected. Also, this network contains a 100mm and 300mm diameter pipe with assumed lengths exceeding the distance of 90m between structures recommended by the Ministry of the Environment. Approximately 200m of pipe is corroded or damaged which makes up approximately 25% of the network. Unknown Networks There are a number of pipes within Port Burwell that have unknown inlets and outlets. A total of approximately 1600m of pipes are unknown and assumed across all streets in Port Burwell. These pipes range from 100mm to 400mm in diameter and have not been inspected via CCTV. Also, much of the network on County roads is unknown and drainage areas to these networks remain unknown. K:Projects\4423\60-Design\4423.Storm Sewer Assessment.rpt.docx October 2015 Page 6 MER IT ECH Storm Sewer System Assessment Vienna il Illr.IIII.tll - 11111MirVik 001! min lb. 000.40 _ 4 4 1 1 s. 2 114 Z11111 JJ i fiLli _-_,Iii illorsitiop. *Iwo ow. wardik isi ......2,,Atimw -,Mil limigni vi..- - *IA eiftwiii---44 A (..... v-*--ili-0 MI .,‘4c. _ ;:..1-, PPo#!k:lrallr44;4111, . .7.4_11]- VI. 1 .i4 ii _________ Figure 3: Vienna Catchment Areas K:Projects\4423\60-Design\4423.Storm Sewer Assessment.rpt.docx October 2015 Page 7 MERITECH Storm Sewer System Assessment Network One Network One has an outlet to Big Otter Creek located north east of the intersection of Ann Street and Edison Road with the network comprised of catchbasin structures on Elm and Ann Streets(see Figure 3 — Green). This network takes a total catchment area of 2.1 hectares. This section contains approximately 350m of pipe with approximately 60% of the pipe lengths assumed due to blind pipes to the main as well as deformed pipes, blockages and debris that could not be inspected. Approximately 70m of pipe is deformed and damaged which makes up approximately 20% of the network. Network Two Network Two has an outlet to Big Otter Creek located east of the intersection of Edison Drive and Fulton Street with the network comprised of catchbasin structures on Edison Drive and Fulton Street (see Figure 3 — Yellow). This network takes a total catchment area of 1.8 hectares. This section contains approximately 200m of pipe with approximately 50% of the pipe lengths assumed due to blind pipes to the main as well as deformed pipes, blockages, and debris that could not be inspected. Approximately 70m of pipe is deformed and damaged which makes up approximately 35% of the network. Network Three Network Three has an outlet to Big Otter Creek located north of the intersection of Queen and Oak Street with the network comprised of catchbasin structures on Oak, Ann, Chestnut, and Queen Streets (see Figure 3 — Blue). This network takes a total catchment area of 4.1 hectares. This section contains approximately 800m of pipe with approximately 60% of the pipe lengths assumed due to blind pipes to the main as well as deformed pipes, blockages and debris that could not be inspected. Approximately 200m of pipe is cracked, deformed and damaged which makes up approximately 25% of the network. Network Four Network Four has an outlet to a culvert located southeast of the intersection of Fulton and Centre Street with the network comprised of catchbasin structures on Centre Street (see Figure 3 — Orange). This network takes a total catchment area of 4.9 hectares. This section contains approximately 550m of pipe with approximately 20% of the pipe lengths assumed due to blind pipes to the main as well as blockages and debris that could not be inspected. Also, this network contains a 100mm diameter pipe with an assumed length of approximately 100m which is greater than the distance of 90m between structures recommended by the Ministry of the Environment. Network Five Network Five has an outlet to Big Otter Creek located northeast of the intersection of Plank Road and Chapel Street with the network comprised of manhole and catchbasin structures on Chapel Street (see Figure 3 — Red). This network takes a total catchment area of 1.8 hectares. This section contains approximately 350m of pipe with approximately 15% of the pipe lengths assumed due to blind pipes to the main as well as deformed pipes, blockages and debris that could not be inspected. Approximately 40m of pipe is cracked, deformed and damaged which makes up approximately 10% of the network. K:Projects\4423\60-Design\4423.Storm Sewer Assessment.rpt.docx October 2015 Page 8 MERITECH Storm Sewer System Assessment Network Six Network Six has an outlet to Big Otter Creek located south of North Street with the network comprised of catchbasin structures on North Street (see Figure 3 — Turquois). This network takes a total catchment area of 1.2 hectares. This section contains approximately 350m of pipe with approximately 40% of the pipe lengths assumed due to blind pipes to the main as well as deformed pipes, blockages and debris that could not be inspected. Approximately 94m of pipe is cracked, deformed and damaged which makes up approximately 30% of the network. Also, this network contains a 600mm diameter pipe with an assumed length of approximately 130m which is greater than the distance of 90m between structures recommended by the Ministry of the Environment. Unknown Networks There are a number of pipes within Port Burwell that have unknown inlets and outlets. A total of approximately 2100m of pipes are unknown and assumed across all streets in Port Burwell. These pipes range from 40mm to 400mm in diameter and have not been inspected via CCTV. Also, much of the network on County roads is unknown and drainage areas to these networks remain unknown. Conclusions Both communities are serviced with road side swales and underground storm sewers for storm runoff. Properties are situated in some instances at grades lower than the road way. We have concluded that the existing storm sewer systems are not functioning as intended. Storm runoff is currently being conveyed predominately overland instead of within the sewer systems. Road drainage appears to be draining without proper outlets, or secured easements. Many of the installed sewers are of a size smaller than recommended by the Ministry of the Environment. In Port Burwell a total of approximately 6200m of storm sewers are present with approximately 25% of the networks assumed and approximately 25% of the networks unknown. Out of the known and assumed networks, the total percentage requiring replacement due to damage is approximately 25%. In Vienna a total of approximately 4400m of storm sewers are present with approximately 30% of the networks assumed and approximately 40% of the networks unknown. Out of the known and assumed networks, the total percentage requiring replacement due to damage is approximately 15%. Calculating the adequacy of the size of the sewers is of no advantage until such time as a proposed network can be properly determined. K:Projects\4423\60-Design\4423.Storm Sewer Assessment.rpt.docx October 2015 Page 9 MERIT E C H Storm Sewer System Assessment Recommendations In order to ensure success in the future of storm water management in the villages of Port Burwell and Vienna a number of recommendations can be made. All networks should be discretized, with catchment areas accurately measured, and each pipe sized accordingly using each network's existing outlet. Annual inspections and storm cleanout programs should be coordinated in order to maintain the effectiveness and reliability of the storm sewer systems. All of the manhole and catchbasin structures should be designed and installed using current (MOE or Elgin County) standards and all new developments should provide onsite stormwater management. The Municipality is best served by having their infrastructure moved within their own right of ways where possible in order to facilitate future maintenance if required. Remedial efforts should begin in Port Burwell as much more is known about the existing conditions in comparison to Vienna. The storm sewers in networks One, Two, and Three should be moved within the right of ways where possible. While doing so this will replace deficient sewers and will reduce liability risk to the Municipality. Networks One and Two drain to outlets in the beach that are subject to burial by the sand and waves from Lake Erie. Creating a new outlet for the Robinson Street storm sewer will require a Schedule C Class EA to be processed, complete with public consultation. It will be important to include Elgin County in this process as the storm systems intertwine. Port Burwell currently utilizes mostly roadside swale drainage systems without curb and gutter. It is recommended that curb and gutter be installed at any roadway equal to or greater than 18m in width per common municipal guidelines. In Vienna all of the deficient sewers should be replaced with an underground storm system as opposed to a roadside swale and culvert system. Culverts commonly cause frost heaving in the winter months which can cause damage to public and private driveways. The detailed design of the storm sewer systems should include: 1. Catchment areas based on drainage divides, 2. Geotechnical consideration for groundwater, 3. A 5-year return period and a lower run-off coefficient to accurately reflect the land use, 4. Consideration of sewer crossings, 5. Re-use of existing outlets, 6. Co-ordination with the County of Elgin, especially where local sewers discharge into the County sewer system and where County roads have sewers connecting into local sewers. K:Projects\4423\60-Design\4423.Storm Sewer Assessment.rpt.docx October 2015 Page 10 MERIT ECH Storm Sewer System Assessment References Bayham, ON. Google Maps. Retrieved October 26, 2015, from https://www.google.ca/maps. K:Projects\4423\60-Design\4423.Storm Sewer Assessment.rpt.docx October 2015 Page 11