The purpose of this survey is to ensure that water drainage from your lot does not cause damage to your home or your neighbor's properties.It may be necessary to acquire a Design Lot Grading and Drainage Plan when you apply for a building permit.Also If you are intending to sever a portion of your property it may be a condition of the Planning Act Approvals that a Lot Grading Agreement be registered on title to your property and the Design Plan will form part of the agreement. Depending on the specifications of the Municipality or other agency requesting the Design Lot Grading Plan, the survey could be related to a local value or may be tied into a Geodetic datum. A field crew attends the property to measure the existing elevations and features on the subject and abutting lots. This information is then used to determine the grading of the lot to control water drainage on the property once construction is completed, and this is illustrated on the plan. There may also be requirements to install culverts, or construct retaining walls, swales and/or other features that will control the drainage. The plan is forwarded to the Municipality for review and approval prior to final submission.