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Lot Grading and Drainage

Flooding caused by heavy precipitation, melting snow, or runoff may pose problems for all kinds of properties. Older and newer houses, residential and commercial developments may be at risk for flooding if proper precautions are not taken.

Property owners are responsible for their own lot grading. Contact the Public Works Department at 705-534-7248 ext. 230 to ensure that you are taking the right steps to prevent flooding on your property.

What is Lot Grading?

Lot grading involves sloping the land in a lot in order to direct the water flow away from a buildings foundation and towards a suitable location without affecting a neighboring property.

Types of Lot Grading:

One Way Drainage - All drainage flows toward the street.

Split Drainage - In split drainage the house is the high point and the lot is graded so that surface drainage flows toward the street and the rear lot line and catch basin.

Rear Yard Catch Basins are located at low points along the rear of the property lines to allow water to enter the storm drainage system which usually requires an easement. 

Swales are shallow grassed drainage channels to collect water and direct it away from the building foundation to a suitable location without affecting a neighboring property.

Lot Grading Process:

Prior to application for a building permit, an individual lot grading plan shall be prepared by a Professional Engineer or Ontario Land Surveyor for the lot on which the proposed building is to be built on.

The Lot Grading Plan shall be reviewed by the Township for approval prior to a building permit being issued.

Lot and house grading should be generally compatible to the existing and surrounding development.

The result of a well-planned lot grading plan and surface draining system is a lot free of ponding, with no adverse effects to adjacent properties.

Policy Lot Grading Plan Criteria:

1. Legend

2. Lot description including Registered Plan Number

3. Dimensioned property limits and house location

4. House type; normal, side split, back split, etc.

5. Finished floor elevation

6. Finished garage floor elevation

7. Finished and original elevations over lot and septic tile beds

8. Finished basement floor elevation

9. Top of foundation wall elevations (all locations)

10. Existing and proposed lot elevations

11. Existing trees to be maintained

12. Driveway location, width and proposed grades

13. The municipal boulevard shall be sodded by the building permit applicant from property line to the edge of the gravel shoulder, asphalt gutter or concrete curb and gutter.

14. The driveway shall be constructed to direct driveway drainage flows into the ditch and not onto the roadway.

15. The driveway shall be paved from the edge of the roadway to the property line when the driveway grade is greater than 6%.

16. The driveway shall be paved between the asphalt roadway and property when there is a sidewalk irregardless of the grade.

17. The Lot Grading Plan shall note item No. 13 and show area of driveway to be paved.

18. Arrows indicating the direction of all surface drainage and swales.

19. Location and elevation of swales

29. Location of decks, porches and patios

21. Location of Terraces and retaining walls

22. The Lot Grading Plan shall be compatible with the Certificate of Approval issued for the installation of the sewage system by the Simcoe County District Health Unit.

23. Prior to issuance of the Occupancy Permit a certificate from the applicant's engineer or Ontario Land Surveyor shall be submitted which shall indicate that the dwelling construction and the final grading of the lot is in conformity with the Grading Plan or that variance from the Plan has been approved by the Township, Simcoe County District Health Unit and the Ministry of Natural Resources.

Location and direction of flow for roof downspout and sump pump discharge must be outlined.

Lot grading deposits shall not be returned until all inspections have been completed and passed. 

Lot Grading & Drainage inspections address residential drainage as part of the residential subdivision process and private residential construction.