Maplehurst Avenue Roadside Drainage

Open HouseJune 18, 2014

Purpose of Study• Investigate and assess the

existing roadside ditch drainage conditions along Maplehurst Avenue and adjacent streets

• Develop and assess alternatives to mitigate drainage issues

• Provide recommendations

Project Methodology1. Topographic survey of road and ditches2. Visual assessment of site3. Develop alternatives4. Estimate costs for each alternative5. Provide recommendations for the preferred alternative

Summary of Findings• North end of Maplehurst Avenue drains north

to a tributary of McCraney Creek• South end of Maplehurst Avenue, 125 m

south of Bridge Road, drains south to storm sewer at Rebecca Street

• Standing water is present in the majority of ditches in the study area indicating poor drainage conditions

• Relatively flat slope within the study area which averages at approximately 0.5%

• Previous attempts at culvert flushing and ditch cleanout have only temporarily solved the problem

Culvert at tributary McCraney Creek

Catchbasin at south end of Maplehurst Avenue

Summary of Findings

Existing Conditions – Maplehurst Avenue

Driveway Culvert at 465 Maplehurst Ave.

West Ditch Between 428 and 422 West Ditch Between 406 and 400

West Ditch South of Shelby Ave.West Ditch and Catchbasin at Rebecca St.

West Ditch at Winston Rd. Intersection

Existing Conditions – Maplehurst Avenue

East Ditch Between 317 and Rebecca St. East Ditch and Catchbasin at Rebecca St.

East Ditch Between 341 and 331East Ditch Between 407 and 401

East Ditch Between 455 and 451

East Ditch Between 445 and 441

Existing Conditions – Adjacent Streets

Culvert at Scott Avenue Culvert at Shaw Street Crossing on Smith Lane

Ditch at 1065 Selby Avenue Ditch at 1062 Shaw Street Winston Rd at Maplehurst Ave

Alternative #1: Do NothingApproximate Cost: $0

Typical ditch on Maplehurst Avenue Typical ditch near Maplehurst Avenue

Alternative #2: Ditch Re-grading and Culvert Cleanout

Approximate Cost: $90,000

Typical Culvert and Ditch Source: Town of Oakville

Culvert clogged with sediment in need of cleanout Typical Maplehurst Avenue Ditch

Alternative #3: Infiltration Trenches and Culvert CleanoutApproximate Cost: $385,000

Typical Infiltration Trench. Source: Credit Valley Conservation – Conestoga College

Typical Infiltration Trench Detail

Alternative #4: Install Storm Sewer and Ditch Inlet Catchbasins

Approximate Cost: $850,000

Storm sewer design plan

Road with storm sewer installedSource: Town of Oakville

Typical Storm Sewer Design

Road with storm sewers installedSource: Town of Oakville

Alternative Summary1. Do Nothing2. Ditch Re-grading and Culvert Cleanout:

– Grade new ditches, at maximum slope, clean out sediment and debris

3. Infiltration Trenches and Culvert Cleanout:– Install 1 m x 1 m infiltration trenches between driveways, clean

out sediment and debris

4. Install Storm Sewers and Ditch Inlet Catchbasins:– Install storm sewer along Maplehurst Avenue with ditch inlet

catchbasins to receive storm water from ditches and repave street

Advantages / DisadvantagesAlternative Cost Advantages Disadvantages

1 – Do Nothing $0 •No cost; and,•No disturbance to properties.

•Ongoing maintenance will continue to be required; and,

•Ditch drainage issues will not be resolved and resident complaints will not be addressed.

2– Ditch Re-grading and Culvert Cleanout

$90,000

•Improves conveyance of standing water;•Lowest cost; •Less maintenance is required;•Less intrusive than other alternatives; and•Driveways will not be affected.

•Short-term solution;•Ditch re-grading has been conducted in previous years and had varying results; and

•Disturb grassed areas.

3 – Infiltration Trenches and Culvert

Cleanout$385,000

•Mitigates standing water for problem areas; and

•Improves infiltration.

•High cost;•Driveways will be affected;•Moderately intrusive grading; •Ditch area will be filled and have a stone layer appearance; and

•Medium-term solution as stone layer will eventually fill up with sediment and decrease infiltration capacity. Reconstruction will be required to restore infiltration capacity.

4 – Install Storm Sewers and Ditch Inlet

Catchbasins $850,000

•Most effective, long-term solution to deal with drainage;

•Most effective solution to remove water from roadside ditches; and

•May be able to make ditches more shallow and remove some driveway culverts.

•Most expensive;•Road will be disturbed;•Longest construction disturbance duration; and•Some driveway aprons may need to be repaved.

• Preferred alternative is Alternative #4: Install Storm Sewer and Ditch Inlet Catchbasins– Best long-term solution to eliminate roadside ditch

standing water on Maplehurst Avenue and adjacent streets

– Try to make ditches as shallow as possible

– Eliminate driveway culverts where possible

– Repave street– No curb and gutter or sidewalks,

maintain shoulders and roadside ditches

Recommendations

Typical Storm Sewer with Ditch Inlets Source: Town of Oakville

• Continue culvert and ditch maintenance– Prevent blocked culverts with periodic cleaning of leaves and

debris– Remove sediments in and around culverts

Recommendations

Typical storm sewer design

• Propose that timing of Maplehurst Avenue storm sewer be advanced in capital budget from 5 to 10 year time frame to 3 to 5 year time frame, subject to council approval

• Complete detailed design based on preferred alternative (2016). Design Process will include public consultation

• Construction (2017)• Continue routine maintenance of cleaning culverts, ditches

and debris from ditches

Next Steps

• We have prepared a comment form that will facilitate the review of your concerns by the Project Team.

• Additional comments can be addressed to:Kasia Piskorz

Town of Oakville1225 Trafalgar Rd

Oakville, ON L6H 0H3905-845-6601 ext. 3533

kasia.piskorz@oakville.ca

• Please submit your comments no later than July 2, 2014.• These display boards will be uploaded to the Town of

Oakville website.

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