Grand River Collegiate Institute Expansion, Kitchener

Address: 175 Indian Road, Kitchener, Ontario

Architect: Kingsland+ Architects Inc.

Photos of construction and completed work

MGM proudly worked as part of the consulting team led by Kingsland+ Architects Inc. to provide civil engineering design and contract administration services for the Grand River Collegiate Institute Expansion located at 175 Indian Road in Kitchener, Ontario.

The expansion project consisted of a 27,000 m2, two-storey addition to provide a new student entrance, study commons, science wing, administration offices, washrooms, and other ancillary spaces. To accomodate the building expansion, the surrounding vehicle parking areas were reconstructed and expanded.

Throughout the application process, MGM navigated through the City of Kichener’s unique and challenging stormwater management design and analysis requirements which included meeting a strict stormwater balance target and using software modelling in analysing quantity controls and sewer capacity. Our project engineers successfully satisfied the stringent water balance criterion through a creative infiltration gallery strategy that enabled our client to avoid the City’s costly cash in lieu fees.

MGM successfully delivered a practical and efficient site engineering and stormwater management system supported by software analysis, which ensured the satisfaction of governing agencies. Our dedicated team effectively managed the application process and reviewed construction works to ensure timely approvals and conformance to the approved plans.

Durham College Whitby Campus Phase 4

Address: 1610 Champlain Avenue, Whitby, Ontario

Architect: Barry Bryan Associates

Photos of project construction and completed work

This project is composed of the new Ontario Power Generation centre for Skilled Trades and Technology (CSTT) academic building, crane field training area, expansion to the campus parking lot, and modifications to the main entrance bus loop. The new 60,000 sq. ft. academic building and crane field provide dedicated space to increase Durham College’s skilled trades training capacity to create more opportunities for students and applied research projects.

MGM provided site grading and servicing design to support the new building and training area, as well as upgrades to the existing watermain system for the main campus to address water supply issues. To comply with the current site plan development guidelines, MGM provided floodplain analysis through the hydraulic modelling of the adjacent tributary in order to establish development limits. MGM also provided stormwater management analysis of the entire school property to design a system that could be constructed in-line with the existing infrastructure, bringing the entire school property in compliance with the latest municipal and conservation authority development requirements.

Newsletter Issue No. 4

Grand River Collegiate Institute Expansion, Kitchener

MGM proudly worked as part of the consulting team lead by Kingsland+ Architects Inc. to provide civil engineering design and contract administration services for the Grand River Collegiate Institute Expansion located at 175 Indian Road, Kitchener, Ontario.

The expansion project consisted of a 27,000 m2, two-storey addition to provide a new student entrance, study commons, science wing, administration offices, washrooms, and other ancillary spaces. To accommodate the building expansion, the surrounding vehicle parking areas were reconstructed and expanded.

Throughout the application process, MGM navigated through the City of Kitchener’s unique and challenging stormwater management design and analysis requirements, which included meeting a strict stormwater balance target and using software modelling in analysing quantity controls and sewer capacity. Our project engineers successfully satisfied the stringent water balance criterion through a creative infiltration gallery strategy that enabled our client to avoid the City’s costly cash in lieu fees.

MGM successfully delivered a practical and efficient site engineering and stormwater management system supported by software analysis, which ensured the satisfaction of governing agencies. Our dedicated team effecively managed the application process and reviewed construction works to ensure timely approvals and conformance to the approved plans.

“Kingsland+ Architects Inc. have worked with MGM Consulting Inc. for over 15 years. MGM is our go to consultant for all civil requirements and has proved to be a reliable, professional consultant we can trust to provide practical solutions in stickhandling the ever-increasing jurisdictional requirements we encounter for our educational, government and industrial projects. MGM provides timely responses and reasonably priced service that we rely on.”

Colin Kingsland, Principal of Kingsland+ Architects Inc.

Under Construction

Portland Commons, Toronto

Construction of the servicing infrastructure for the Portland Commons development in Toronto has been completed. When fully constructed, Portland Commons will be a 15-storey, 560,000 sq. ft. office building with retail and restaurant space at ground level. Designed by Sweeny &Co Architects and being built by EllisDon, the project team’s goal is to achieve LEED Platinum Certification.

6712 Fifth Line, Milton Stormwater Management (SWM) Pond

The SWM pond for one of MGM’s many industrial subdivision projects is being constructed at 6712 Fifth Line in Milton, Ontario. This pond will provide stormwater quality, quantity, erosion, and flood control for the entirety of the 24.6-hectare site which will be occupied by four industrial warehouse buildings. The SWM facility block is approximately 2.5-hectares and will be assumed by the Town of Milton through the subdivision process.

Medical Office Building, Mississauga

Construction of a new medical office building located at 5590 Tenth Line, Mississauga, is almost complete. MGM worked alongside NOOR Architects to design the new office building with surface and underground parking, which began construction in 2021.


In Design

Cashmere Avenue School Addition, Mississauga

A 700m2, one-storey building addition is being design in collaboration with Kingsland+ Architects Inc. for the Cashmere Avenue Public School to add much needed childcare space.

Petro Canada Redevelopment, Mississauga

The existing fuel site at 5835 Airport Road is being upgraded with a new and improved 6 channel gas bar and convenience store.

808 Mount Pleasant, Toronto

A 35-storey mixed-use condominium building is curently being designed for Streetwise Capital Partners Inc. in collaboration with Sweeny &Co Architects.

Newsletter Issue No. 3

Durham College Whitby Campus Phase 4

Photos of construction progress and finished development.

MGM was retained by Durham College, through Barry Bryan Associates, to provide civil engineering services for the construction of Durham College’s Phase 4 development project. This phase included the construction of the new Ontario Power Generation Centre for Skilled Trades and Technology (CSTT) academic building, crane field training area, expansion of the campus parking lot, and modifications to the main entrance bus loop on Champlain Avenue. The 60,000 sq. ft. new academic building, and 64,584 sq. ft. crane field, were designed to provide dedicated space to increase Durham College’s skilled trades training capacity to create more opportunities for students and applied research projects.

As part of the proposed development, MGM provided floodplain analysis through hydraulic modelling of the adjacent tributary of Corbett Creek to establish development limits, as well as provided stormwater management analysis of the entire school property with the aim of designing a system to be constructed in-line with the existing services that would bring the entire school property in compliance with latest conservation authority development requirements. MGM also provided servicing design to upgrade the existing watermain system for the main campus to address water supply issues noted by the school.

Caledon East Community Centre

Photos of construction progress.

MGM was retained by the Town of Caledon, through Barry Bryan Associate, to provide civil engineering services for the expansion of the Caledon East Community Centre located at 6215 Old Church Road in Caledon, Ontario. This expansion project includes the construction of the new 57,600 sq. ft. recreation building to house a library, gymnasium, workout room, pool, change rooms, warm viewing area into the arena, multi-purpose rooms, and a food service area to provide recreational amenities for all ages, abilities, and interests. Additionally, MGM has been retained to provide civil engineering services for the outdoor ice rink which has recently been approved by the Town and taken on by the firm. More news on this sub-project is forthcoming.

As part of the background review and investigation of the existing infrastructure, it was determined the existing stormwater management (SWM) pond did not provide the required quantity and quality control for the proposed expansion. In response to this, a massive underground storage system was designed to allow for a controlled rate of release into the SWM pond to ensure proper quantity control is achieved within the subject site. In terms of quality, a new treatment unit has been designed to treat the drainage coming from the new and existing parking lots prior to discharging to the SWM pond.

Gordon Food Service Distribution Centre, Ajax

Photos of construction progress and completed development.

MGM was retained by GFS Properties Ltd, through Maple Reinders Constructors Ltd., to provide civil engineering services for the design and construction of the Gordon Food Service Distribution centre located at 200 Salem Road North in Ajax, Ontario. This project included the construction of a new single-storey, 343,413 sq. ft. industrial building with loading docks and multiple parking lot areas. This development was designed to account for a potential 100,000 sq. ft. future expansion.

Stormwater management quality controls for a majority of the site were provided by both package treatment, in the form of a prefabricated treatment unit, and passive treatment features, such as bio-swale treatment areas which are encouraged by the local Conservation Authorities. Separate quality controls were required for the truck fueling station due to the potential gasolines, oils, heavy metals, and other contaminants surface runoff flows in this area. Discharged flows from the fueling station are directed towards an oil and water separator unit where it is processed prior to being routed into the main storm system for secondary treatment.

HeyRay Self Storage Facility, Georgetown

Photos of construction progress and completed development.

MGM was retained by Riepma Consultants Inc., to provide civil engineering services for the construction of the new HeyRay Self Storage Facility located at 13394 Highway 7 in Georgetown, Ontario. Developed in three phases, the site now holds five self storage units, one office, and paved access and parking areas including one driveway access off Highway 7.

Stormwater rate controls were achieved utilizing an orifice tube prior to outletting to the ditch on Highway 7. This orifice control ensures post development flow rates are controlled to be below the calculated allowable flow rates for major and minor storm events. A ponding area was designed in the northeast corner or the site to act both as on-site storage and quality control for flows from paved areas prior to outletting to the ditch along Highway 7.

KING Toronto

Address: 485-539 King Street West, Toronto, Ontario

Developer: Westbank Corp. and Allied Properties REIT

Architects: Bjarke Ingels Group (BIG) and Diamond Schmitt Architects

Renders and photos of KING Toronto development

This development includes the construction of a mixed-use development composed of a permitter block of residential, retail, and boutique office spaces, surrounding a central public plaza situated over four underground parking levels. The public plaza will include a hardscaped courtyard with a water feature, an intensive landscaped gathering and seating areas.

As this development is located within the heart of Toronto’s downtown King West neighbourhood, a vital design goal for the site engineering was to compliment the elegant architectural design while meeting the City’s stringent stormwater management requirements. Low-Impact Design (LID) principles were used throughout the design to focus on water retention and re-use. Specifically, drainage features were integrated into the landscaping and courtyard design, and rain garden planters and green roofs systems were included throughout the site to significantly increase stormwater retention and reduce runoff. Excess stormwater runoff will be collected and utilized for the building’s internal plumbing and external irrigation. The LID components enabled the site to achieve water retention objectives that far exceeded the City’s standards while ensuring the aesthetic, green-focused architecture and site design remained uncompromised.

This project is currently in the construction phase with MGM Consulting continuing to provide construction administration services including periodic site inspections. The estimated completion date for KING Toronto is set for Summer 2023.

Construction Inspector

MGM Consulting Inc. is a consulting firm of civil engineers and project managers providing site servicing, grading, and stormwater management services to the land development industry. We are a small firm of collaborative team members who work in an open and inclusive culture. Our firm is committed to ensuring a cohesive team working environment to provide our clients with innovative and cost effective site engineering solutions with professional excellence.

MGM Consulting Inc. is currently seeing a full-time Construction Inspector to provide inspection services for multiple sites located throughout Southern Ontario. A successful candidate will have experience in municipal sites located throughout Southern Ontario. A successful candidate will have experience in municipal servicing construction and perform well defined and sometimes difficult inspection tasks to ensure compliance with all applicable codes, standards, and specifications.

Responsibilities:

  • – Maintain communication with contractors, stakeholders, and project managers regarding projects,
  • – Gather field information during the construction process for translation into revised drawings, record drawings, and completion documentation,
  • – Manage field data records, safety records, drawing markups, and testing reports,
  • – Ability to interpret construction documents, accurately perform mathematical computations, review and interpret engineering data, and make sound decisions,
  • – Assist project managers with contract administration and budget tracking,
  • – Aid in the preparation of engineering documents including grading plans, servicing plans, municipal infrastructure plans, road design, and stormwater management designs.

Qualifications & Skills:

  • – An undergraduate degree in civil engineering from an accredited university OR a 3-year civil technology diploma from an accredited college,
  • – 2+ years of experience relating to municipal infrastructure project is preferred,
  • – Ability to travel to various project locations throughout Southern Ontario is required,
  • – Experience with Total Stations and GPS Units is required,
  • – Proficiency with AutoCAD and Civil3D is required,
  • – Knowledge in construction safety standards,
  • – Proficiency in Microsoft Applications including Word, Excel, Outlook, etc. is beneficial,
  • – Strong communication skills (written & verbal) and ability to maintain professional and effective working relationships with project Owner, Client, and teams from other disciplines,
  • Strong organizational, personnel, project tasks, and time management skills.

The successful candidate will be working out of our Milton office located at 555 Industrial Drive. We offer full benefits following a 3-month probationary period. MGM Consulting Inc. provides the freedom and opportunities to grow within your role as your career progresses within the firm.

MGM Consulting Inc. is proud to be an equal opportunity employer. We are committed to building an organization that empowers inclusion and diversity. We encourage candidates and employees to be true to themselves and express all aspects of their identities.

Should you wish to apply for this position, please email a cover letter summarizing your suitability for this position along with your resume to our Office Administrator at mgm@mgm.on.ca

Water Resource Engineer

MGM Consulting Inc. is a consulting firm of civil engineers and project managers providing site servicing, grading, and stormwater management services to the land development industry. We are a small firm of collaborative team members who work in an open and inclusive culture. Our firm is committed to ensuring a cohesive team working environment to provide our clients with innovative and cost-effective site engineering solutions with professional excellence.

MGM Consulting Inc. is currently seeking a full-time Water Resource Engineer. The successful candidate will lead all aspects of MGM’s water resource projects and provide technical leadership to junior staff. Ideally, the successful candidate will be involved in a variety of projects including watercourse engineering, stormwater management, floodplain analysis, sub-watershed studies, environmental impact studies, and erosion and sediment control design.

Responsibilities:

  • – Maintain communication with stakeholders and project managers regarding projects,
  • – Mentoring less experience staff,
  • – Assist in the preparation of proposals and work closely with clients,
  • – Work on multiple project simultaneously,
  • – Prepare and review engineering calculations, hydrologic, and hydraulic models using industry software,
  • – Complete detailed designs and provide contract administration relating to water resource.

Qualifications & Skills:

  • – An undergraduate degree in civil engineering from an accredited university,
  • – 3+ years of experience relating to water resource projects is preferred,
  • – Proficiency with AutoCAD and Civil3D required,
  • – Proficient in Microsoft applications including Word, Excel, Outlook, etc. highly beneficial,
  • – Strong communication skills (written and verbal) and ability to maintain professional and effective working relationships with project Owner, Client, and teams from other disciplines,
  • – Strong organizational, personnel, project task, and time management skills.

The successful candidate will be working in our Milton office located at 555 Industrial Drive. We offer full benefits following a 3-month probationary period. We provide the freedom and opportunities to grow within your role as your career with MGM Consulting progresses.

MGM Consulting Inc. is proud to be an equal opportunity employer. We are committed to building an organization that empowers inclusion and diversity. We encourage candidates and employees to be true to themselves and express all aspects of their identities.

Should you wish to apply for this position, please email a cover letter summarizing your suitability for this position along with your resume to our Office Administrator at mgm@mgm.on.ca

Design Engineer

MGM Consulting Inc. is a consulting firm of civil engineers and project manager providing site servicing, grading, and stormwater management services to the land development industry. We are a small firm of collaborative team members who work in an open and inclusive culture. Our firm is committed to ensuring a cohesive team working environment to provide our clients with innovative and cost-effective site engineering solutions with professional excellence.

MGM Consulting Inc. is currently seeking a full-time Design Engineer to join our team. A successful candidate will have experience in civil engineering and have significant understanding of grading, servicing, and stormwater management designs associated with approval processes throughout the GTA. Ideally, the successful candidate will be expected to work successfully within a team environment and be able to communicate effectively with other project team members and customers.

Responsibilities:

  • – Prepare conceptual engineering designs and Functional Servicing Reports,
  • – Prepare detailed grading, servicing, and sediment and erosion control drawings using AutoCAD,
  • – Prepare earthworks calculations,
  • – Pepare and review stormwater management calculations and hydrologic and hydraulic models using industry software,
  • – Prepare construction cost estimates,
  • – Track and coordinate the approval process with approval authorities,
  • – Ability to work on multiple projects simultaneously,
  • – Ensure the quality of engineering drawings while maintaining project deadlines,
  • – Ongoing monitoring of project budgets.

Qualifications & Skills:

  • – An undergraduate degree in civil engineering from an accredited university OR a 3-year civil technology diploma from an accredited college,
  • – 3+ years of experience and understanding of the engineering theory related to sanitary, storm, and watermain design,
  • – Proficiency with AutoCAD and Civil3D required,
  • – Proficient in Microsoft applications, including Word, Excel, Outlook, etc., is highly beneficial,
  • – Strong communication skills (written and verbal) and ability to maintain professional and effective working relationships with project Owner, Client, and teams from other discipline’s,
  • – Strong organizational, personnel, project task, and time management skills.

The successful candidate will be working in our Milton office located at 555 Industrial Drive. We offer full benefits following a 3-month probationary period. MGM Consulting Inc. provides the freedom and opportunities to grow within your role as your career progresses.

MGM Consulting Inc. is proud to be an equal opportunity employer. We are committed to building an organization that empowers inclusion and diversity. We encourage candidates and employees to be true to themselves and express all aspects of their identities.

Should you wish to apply for this position, please email a cover letter summarizing your suitability for this position along with your resume to our Office Administrator at mgm@mgm.on.ca

Newsletter Issue No. 2

University of Toronto Health Sciences Complex

Photos of completed building, SWM pond, and construction progress.

MGM was retained by the University of Toronto, through Kongats Architects to provide civil engineering services for the construction of the new Health Sciences Complex located on their Mississauga campus. This award-winning, 65,000 sq. ft. academic facility houses the Mississauga Academy of Medicine, the Department of Biomedical Communications, and the Department of Anthropology and Forensics. Since completion, this project has received LEED Gold Certification and numerous awards such as the 2012 OAA Design Excellence Award, the 2013 ARCHITIZER Special Medal in Architecture, and the 2012 Governor General’s Medal in Architecture.

Stormwater management quality controls for the site were provided by a centralized downstream wet pond that was designed by MGM. The design includes a diversion structure for maintenance operations and weir gates that allow researchers to control flows to the pond to examine the impacts of full flow through different scenarios. To assist in the project obtaining LEED Gold, MGM in collaboration with the project mechanical engineers, provided design of a rainwater harvesting and reuse system that uses collected stormwater for use in plumbing fixtures throughout the building. 

KING Toronto

Renders of proposed building and photos of construction progression.

KING Toronto Condos is a redevelopment project of 485- 539 King Street West by renowned designer Bjarke Ingels Group (BIG) for Westbank Corp. and Allied Properties REIT, currently under construction. MGM was retained to provide civil engineering services for this project, which includes the construction of a mixed-use development composed of a permitter block of residential, retail, and boutique office spaces, surrounding a central public plaza situated over four underground parking levels. The public plaza will include a hardscaped courtyard with a water feature, an intensive landscaped gathering and seating areas. 

As this development is located within the heart of Toronto’s downtown King West neighbourhood, a vital design goal for the site engineering was to compliment the elegant architectural design while meeting the City’s stringent stormwater management requirements. Low-Impact Design (LID) principles were used throughout the design to focus on water retention and re-use. Specifically, drainage features were integrated into the landscaping and courtyard design, and rain garden planters and green roofs systems were included throughout the site to significantly increase stormwater retention and reduce runoff. Excess stormwater runoff will be collected and utilized for the building’s internal plumbing and external irrigation. The LID components enabled the site to achieve water retention objectives that far exceeded the City’s standards while ensuring the aesthetic, green-focused architecture and site design remained uncompromised. 

Pheasant Run Park

Photos of completed splash pad and playground features within Pheasant Run Park.

MGM was retained by the City of Mississauga, through Baker Turner Inc., to provide civil engineering services for the redevelopment of Pheasant Run Park located at 4140 Pheasant Run, Mississauga. This project included the integration of a newly acquired section of land previously owned by the neighbouring school, and the construction of new park facilities that are geared to creating a functional, safe, and vibrant community park. Proposed site improvements included a spray pad, outdoor skating rink, soccer pitch, seating, reconstructed parking lot, open lawn areas, and landscaping throughout the park. 

MGM provided design of the water supply to the spray pad feature in accordance with Regional standards, as well as retrofit and decommissioning of existing on-site services to suit the proposed development. Within the design, grassed swale area was used as a bio-treatment and infiltration feature for water treatment and groundwater recharge for excess water run-off from the spray pad feature. 

Bronte Street & Main Street Professional Centre

Photos of finished building and construction progress.

MGM was retained by Green Propeller Design Inc. to provide civil engineering services for the design and construction of a 4-storey commercial building located at 6 Bronte Street, Milton, Ontario. The building is occupied by office and retail spaces, as well as a medical clinic, with an underground parking garage.

In order to maximize the development site area of 0.3 hectares, a high degree of coordination between architect and consultant team was required. Site grading was designed to accommodate the extended surface driveway and parking lot which is positioned through a portion of the building’s ground floor and to account for the access ramp to the underground parking area. The site design also was done to allow for the future turning lane expansion at the adjacent intersection. 

Toyota Parts Distribution Facility

Photos of completed building and truck bay.

MGM was retained by Leeswood Construction to provide civil engineering services for the design and construction of a new Toyota Parts Distribution Facility located on an undeveloped 12.1 hectare site located on the northwest corner of Baseline Road and Lambs Road in Clarington, Ontario. The development included the construction of a 32,894 sq.m. automotive parts depot and offices building, passenger vehicle parking, truck access and loading areas. This project received LEED Gold and Net Zero Carbon Certification.

MGM designed the stormwater management (SWM) pond for this industrial development to meet the Central Lake Ontario Conservation Authority stringent SWM design requirements including the requirement for stacked storage. To satisfy this requirement, the SWM pond was designed to capture and control successive rainfall events, providing both flood and water quality protection for the site. Additionally, Low-Impact Design (LIC) principles were utilized to reduce impact on the storm sewer system and SWM pond. This was done by directed surface flows towards bioswales and landscape features prior to collection into the storm sewer system which promoted pollutant removal and infiltration. A 25,000-litre cistern was also included within the design to supply the facility’s low-flow washroom features with runoff collected from the roof, saving more than 325,000 litres of water per year.

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Spectrum Square

 
Spectrum Square is a 1.3 million square foot LEED Gold office campus located in Mississauga’s Airport Corporate Centre north of Eglington Avenue West between Satellite Drive and Spectrum Way. MGM Consulting Inc. was retained to provide the site servicing, grading and stormwater management design in support of the Site Plan Approval process and to provide construction supervision during the servicing and grading component of the project. MGM Consulting was also retained to provide designs and construction related services as required for the upgrading of an existing un-assumed City roadway bordering the site as required to achieve current City of Mississauga standards.
 
 
The stormwater management design for the site was completed to achieve LEED standards and the City of Mississauga’s Green Development objectives. The water balance, quality and quantity requirements were met by employing a multi strategy design which included green roofs, internal stormwater cisterns, bioswales, permeable pavement, oil water separators and underground infiltration pits. Construction of this project as initiated in 2014 and scheduled to be completed in 2017/2018.

UTM Stormwater Management Pond

The Erindale Campus of the University of Toronto was originally constructed in the late 1960’s which preceded concerns over the control and treatment of stormwater runoff. With major expansions to the Campus since the completion of the 2000 Master Plan, there has been pressure on the University to implement a comprehensive Stormwater Management Plan, as opposed to relying on numerous development specific SWM measures.

The Master Drainage Plan for the Campus recommended an ‘end of pipe’ facility (pond) to accommodate the water quality and erosion control objectives for the site. This pond was to be located within existing parking areas near the location where the storm drains flow into the Credit River. As a result, the parking area required reconfiguration and the natural heritage ecology of the valley needed to be incorporated into the pond design.

MGM Consulting designed the pond to service the 54.51 ha of storm catchment. The Enhanced Level controls required the provision of 6,123 m3 of permanent pool and 2,180 m3 of extended storage to service the erosion control criteria. The design includes a diversion structure that allows diversion of storm flows during maintenance operations. The weir gate also allows researchers to control flows to the pond to examine the impacts of full flow through scenarios as opposed to flows limited to first flush events.

Reducing Site Costs By Going Green

 
In addition to the emergence of LEED Certification over the last number of years, municipalities and conservation agencies have set sustainable planning objectives for new developments with a push towards “Low Impact Development” (LID) requirements. LID strategies emphasize the use of natural or engineered stormwater controls to mimic the natural hydrological cycle. The main goals of the LID initiative is to reduce stormwater runoff volumes and rates, reduce pollutant loading to downstream municipal sewers and receiving waters, recharge groundwater and to provide water conservation.

 

There are several LID practices available which range in both cost and effectiveness. It is also important to note that some practices provide more than one benefit. For example, permeable pavers will reduce peak flows, reduce runoff volumes and trap sediments which improve the quality of stormwater runoff. A bio-swale and infiltration pit feature would provide the same benefits more cost effectively, but may not be appropriate due to space limitations or soils conditions. Selecting the appropriate LID practices can speed up approvals, and often reduce site servicing costs by eliminating portions of the traditional site drainage features (catchbasins and storm sewers). Combining LID practices and incorporating them into the overall stormwater design by working back from the most economical practice will reduce the overall cost associated with the servicing component of a project.

 

A recent Fire Station project completed by MGM included a centralized bio-swale surrounded by a strip of permeable pavers within the parking lot with an infiltration pit constructed below. These three separate LID practices constructed together achieved multiple stormwater objectives within a single footprint. The upper bio-swale area provided both a portion of the required storage volume during a 100 year storm event as well as a quality component for sediment and phosphorus removal. The infiltration pit below the bio-swale provided the majority of the required water balance component. The small strip of permeable pavers constructed along the edge of the bio-swale was installed to achieve the remaining water balance requirement. The philosophy was to maximize the design value of the less expensive infiltration pit and bio-swale while minimizing the required area of the more expensive permeable pavers to achieve the municipality and conservation authority objectives.

 

In some situations where site conditions are favourable, implementing LID practices can result in a more economical approach than the traditional site servicing designs that were required before sustainable planning objectives were introduced. These economies are only realized when the proper engineering principles are applied to optimize the design. For example, drainage swales were traditionally required to be graded with a minimum of a 2% slope while bio-swales and enhanced swales can be graded as low as 0.5%. The reduction in slope allows for a longer contact time for runoff which assists with pollutant removals. The slope reduction also provides more latitude in the grading design which could reduce earthwork costs as well as servicing costs by reducing the number of storm structures.

 

MGM recently reviewed a functional engineering report at the request of a developer due to unanticipated site work costs. The functional design was for a 17 hectare industrial development which included a traditional storm system for drainage conveyance. LID practices were not required for this particular development and as a result were not employed into the functional design. The report indicated that an extensive amount of engineered fill would be required due to grading constraints at the perimeter of the site. MGM redesigned the site by incorporating a bio-swale with an overflow storm system along the rear of the property. The redesign allowed for the majority of the rear parking lot to drain via sheet flow to a perimeter bio-swale therefore eliminating a large portion of the storm conveyance system. The decreased bio-swale grades reduced the grading constraints which allowed for the finished floor to be lowered by 1.0m eliminating the requirement to import fill. Incorporating LID strategies into this particular project drastically reduced servicing and grading costs, increased the marketability of the development and was supported by the approval authorities which assisted in expediting permits.

 

For more information on this topic and how it could relate to your project, contact MGM directly.