A Lot Grading Plan (Surface Drainage Plan) has been a part of the approval process for commercial and multi-family properties since 1993. The plan is required for new developments and approved by Drainage Planning on behalf of City Council.
This plan specifies design elevations, surface gradients, swale locations, and other drainage information required for lot grading. The approval of this plan provides an effective basis for lot grading control which will establish the drainage relationship between adjacent properties.
Upon application for a development permit for any land zoned Commercial, Industrial, Multi-family, Apartment, Row Housing and Urban Services, the developer has to submit a proposed Lot Grading Plan to Drainage Planning for approval. This plan must be completed within 60 days of the issuance of the building permit.
- A scale drawing of the property in metric units, designed and certified by a Professional acceptable to the City Manager. For example, Professional Engineer, Registered Architect or Professional Technologist.
- Existing surface elevations, contours and surface grades of the property and adjacent properties based on geodetic datum
- Proposed geodetic surface elevations at the property corners and at intervals around the perimeter of the property
- Proposed directions of surface drainage flow, indicated by arrows
- Proposed geodetic surface elevations adjacent to the foundation walls or concrete slab-on-grade for each proposed building
- Proposed locations and gradients of swales with cross-section details
- Proposed surface conditions such as sod, asphalt, concrete, gravel
- Provisions for accommodating overland flows from adjacent undeveloped lands
- Private storm drainage system demonstrating compliance with the Drainage Bylaw including stormwater management locations and depths
- Information referring to Geotechnical Reports produced by a Geotechnical Engineer when unusual or special requirements are needed
- Facilities and means demonstrating compliance with the stormwater management controls and storage requirements.
- Property information of legal description, subdivision or neighbourhood, and property address (if applicable) or road names
- Project information including project name, applicant information, development boundary, revision box, legend, notes (if applicable), and north arrow
- Space near the bottom right corner of the plan for the approval stamp
Drainage Planning will send a letter to the applicant after reviewing the proposed Lot Grading Plan, notifying the applicant whether the plan is approved or needs revision. The applicant is responsible for revising and re-submitting the Lot Grading Plan for further review within 60 days.
Once the proposed Lot Grading Plan is approved, it will be stamped and signed and returned to the applicant for site construction.
If changes to the approved Lot Grading Plan are required, a revised drawing (red-line revision) must be sent to Drainage Planning along with the written consent of the affected property owners for review and approval. Once approved, this revised Lot Grading Plan will replace the previously approved one.