SECTION XIV - GRADING
14.1
General
Lot grading shall conform to the following specifications
subject to the requirements of the major drainage system
and limits on the depth of street flow and to the
standard detail drawings .
14 . 2
Grades
Lots are to be designed with a 5% grade for 1.5 to 3.0
m from the house foundation.
Yard areas shall be designed with
2% to 5% grades.
Non- yard areas shall have maximum grades of 20 % where
possible or 30% where necessary.
A soils stability
report is required if slopes steeper than 30% are
proposed.
Any lot with a 10% average grade may require split level
dwellings and cross sections may be required .
Swales shall be designed with 1%-5% grades depending on
flow and shall generally be 2% where possible.
Private lot catchbasins shall be eliminated wherever
possible, and only allowed where necessary and where all
structures are protected from flooding if the inlet is
blocked or surcharged by a major storm event and approved
by the Township Engineer.
connections for catchbasins serving a single lot shall
be regarded as service connections and shall be the
responsibility of the lot owner to maintain.
Where several lots drain to a catchbasin on private
property, an easement shall be provided . The catchbasin
drain lead and easement shall be located along the rear
yard lot line and have minimum easement width of 6 m,
3.0 m each side of the property line.
November 25, 1989
59
14.3
Lot Grading Plan
A lot grading plan, which may incorporate the information
required for the drainage plan, shall be submitted to and
approved by the Township Engineer.
The plan shall show existing elevations for each lot
corner along with contours plotted at 0.5 m intervals.
Contours should be extended 30.0 m outside of the
development area.
Proposed elevations for the street centreline at 20 m
intervals, lot corners, building lines, break points in
side yard swales and first floor of each house shall be
shown. Minimum specified house grades shall be s hown as
per the standard detail drawings.
14.4
Tree Planting
One tree per lot shall be planted in a location
stipulated or approved by the Township.
A minimum
separation of 3 m is required between the tree location
and any service to the lot.
Each tree shall have a minimum height of 2.4 m and
diameter of 50 rom measured 0.3 m above grade, and must
be planted in accordance with good nursery practices.
The trees selected may be any two or more varieties
chosen from the following:
Acre platanoides - Norway
Maple including Crimson King and Schwedleri; Ginkgo
biloba - staminate trees only; Moraine Locust; Quercus
Borealis - Red Oak; Tilia cosdata - Little Leaf Linden.
Other species and varieties may be planted subject to the
written approval of the Township.
14 . 5
Sodding and Seeding
Each lot is to receive 75 mm topsoil and b e sodded from
the street line to the rear building line of the
The remaining area is to be seeded and seed
dwelling.
and sod must be of a quality satisfactory to the
Township .
Nov embe r 25, 1989
60
14.6
Lot Development Plans
14.6.1
Basic Requirements
After approval of the general lot grading plan and prior
to the issuance of building permits, the Consulting
Engineer shall submit to the Township Engineer for
approval of 3 sets of the proposed lot development plan
for those particular lots for which a building permit is
desired.
That submission would be accompanied by a
letter which would express the Consulting Engineer's
approval. The details and content of the lot development
plan a-nd the design criteria for lot grading and drainage
are outlined in the following section.
It is expected that the majority of proposed lot
development plans would conform to the general lot
grading plan. All deviations which are certified by the
Consulting Engineer and subsequently approved by the
Township Engineer will require a revision to the general
lot grading plan .
14.6.2
House Plans
House plans shall be submitted with the lot development
plans to verify locations and elevations of the following
to be shown on the development plans:
Footing, first floor and garage floor;
Top of foundation wall;
window sills;
Doorways;
Patios and walkouts;
Retaining walls.
November 25, 1989
61
14.6.3
Grading and Detail
The lot development plans shall show the following
grading and miscellaneous detail at a scale of 1:250:
Existing and proposed elevations at lot corners,
Driveway location and elevations of sidewalk(s) and
percent grades;
Direction of surface flow;
Location, grade and inverts of swales;
Centre-line elevation of roadway adjacent to lot;
Location of all catchbasins and elevation of grates;
Hydrants,
streetlights, transformers,
pedestals, and sidewalks;
telephone
Proposed ground elevations adjacent to the building
and at corners.
Water and sewer service locations and elevations.
Limit of seeding and sodding .
November 2 5, 1989
62