The Corporation of the City of Pickering
Planning & Development Department
Engineering Design Criteria
Lot Grading Plans
1.
All plans are to be drawn in metric.
2.
All plans must be drawn at a scale of 1:500.
3.
Show the Title Block in the lower right-hand corner of the drawing. The
Title Block must include the following information:
a) Revision Block
b) Subdivision Name and Street or Easement Limits
c) “Approved” - Provide a line for signature and date. The following
note must be placed under the signature; "Approval to works
required by City of Pickering and as defined in the Subdivision
Agreement."
d) Consultant's Name and Engineer's Stamp
e) Scale
f) Designed by, Drawn by and Checked by
g) Date Issued
h) Draft Plan of Subdivision No. 18T-________ and / or SP-________
i) Registered Plan No. 40M-________
j) Drawing Number
4.
Show a Key Plan in the upper right-hand corner of the drawing. The Key
Plan should include a North arrow and scale.
5.
Indicate the North arrow on all plans.
6.
Refer all datum to a City of Pickering Bench Mark.
7.
Show existing contour lines at 0.5 metre intervals to a point beyond the
limits of the subdivision, sufficient to determine existing drainage
patterns.
8.
No front yard catch basins shall be allowed without approval from the
Director, Planning & Development.
9.
Storm drainage is to be self-contained within the subdivision limits.
LG-1
10.
The Standard Notes for all lot grading plans are to be shown on the
right-hand side of the drawing above the Title Block and are as follows:
a) All rear yard catch basins are to be fitted with a raised catch basin
cover or a beehive catch basin cover (City Standard Drawing
P-214 or P-215).
b) An undisturbed strip and/or flat area having a width of 0.6 metres
shall be provided within the boundary limits adjacent to other
properties, developed or undeveloped, in order to maintain the
existing boundary elevations. No filling up to, or on private lands
shall be tolerated unless the abutting owner furnishes written
permission.
11.
Show all existing services, above ground utilities, sidewalks, curbs, etc.,
and abutting property limits in broken lines, indicating them as such.
12.
Show all proposed above ground services, sidewalks, curbs, road
allowances, street names, etc.
13.
Show all existing and proposed lot numbers, blocks, easements and
phases if applicable.
14.
Show all existing and proposed maintenance holes and catch basins,
indicating them as such.
15.
Show all proposed rear yard catch basins, leads, inverts, top of grate
elevations and easements.
16.
Show the existing and proposed elevations at the lot corners with the
proposed elevation over the existing elevation.
17.
Show the grade at the front of the proposed house and/or garage. The
grade at the rear of the proposed house must be shown if it differs from
the elevations at the front, and the house type must be indicated.
18.
Show the proposed road grades, lengths and elevations on all streets,
with symbols at grade changes indicating direction of slope.
19.
All property lines for multiple unit lots to be indicated on the plan with a
dashed line.
20.
Show the proposed elevations along the boundary of all blocks abutting
single family and semi-detached lots in the subdivision.
21.
All lots with a frontage 12.0 metres or less must have their downspouts
connected to the storm sewer unless otherwise directed by the
Director, Planning & Development.
LG-2
22.
Driveways shall have a minimum slope of 2.0% and a maximum slope of
8.0% towards the road. Reverse driveways sloping towards the garage
are not permitted.
23.
Front Lot Drainage - The front house grade is to be a minimum of
0.5 metres higher than the high lot corner at the street line.
24.
Back Lot Drainage - The front house grade is to be a minimum of
0.5 metres higher than the high lot corner at the street line.
25.
Drainage flows shall be directed away from the house.
26.
Yard surfaces shall have a minimum slope of 2.0%.
27. a) The maximum average slope of yard surfaces shall be 15.0%. The
average slope shall be measured:
(i)
from the rear of the house to the rear of the lot; or
(ii) from the rear of the house to the centre line of the rear swale;
and
(iii) from the side lot line to side lot line.
b) The maximum yard surface slope at any location shall be 5.0% and a
slope of 3 parts horizontal to 1 part vertical shall be used to take up the
grade differentials in excess of this 5.0% slope. Failing this, a retaining
wall shall be constructed to the satisfaction of the Director,
Planning & Development. Provide type of wall with details, and top and
bottom of wall elevations. (Pressure treated timber is not acceptable).
Any retaining wall, which meets or exceeds 1.0 metre in height must be
designed by and the installation certified by, a professional engineer.
Also, a minimum 1.2 metre high chain link fence or approved equivalent
shall be erected on top of the wall.
c)
Terraces between lots shall be located in the lower lot with the top of the
slope at the lot line. Terraces within the lot shall maintain 1.0 metre
clearance at a grade of 2.0% - 5.0% from the toe of the slope to the
property line.
d) Where the lot is irregular in shape, the shortest distance calculated in
27(a) shall be used.
(e) Where the backyard is over 30.0 metres in depth, 27(a)(i) or (ii) cannot
be applied.
LG-3
28.
Lot grading aprons at the rear of the house shall extend a minimum of
5.0 metres from the rear of the house and have a slope between 2.0%
and 5.0% away from the house. Aprons not meeting the minimum
requirements are not permitted without approval from the
Director, Planning & Development.
29.
Drainage flows, which are carried around the houses, are to be confined
in defined swales located as far from the house as possible.
30.
Desirable swale depth is to be 250 mm. Minimum swale depth is to be
150 mm. Maximum swale depth is variable, and depends on location
and safety considerations, but must not exceed 450 mm.
31.
Swales shall have a minimum slope of 2.0%.
32.
The flow in a side yard swale shall be that from three backyards or
550 square metres whichever is less.
33.
The flow in rear yard swales shall be that from a maximum of ten
backyards depending on lot size and grade. The maximum length of
rear yard swales shall be 60.0 metres. The maximum area contributing
to the rear yard swale shall be 0.4 hectares. The maximum flow in rear
yard swales, which may be discharged onto the road allowance, shall be
that from three backyards or 550 square metres whichever is less.
34.
The maximum side slope for any swale shall be 3 parts horizontal to 1
part vertical.
35.
Swales located more than 1.5 metres from the rear lot line will not be
permitted without approval from the Director, Planning & Development.
36.
There shall be a 0.6 metre wide path at a 2.0% slope away from the
house, except where side-yard setbacks from lot lines do not permit.
37.
Where the side-yard distance between buildings is 1.2 metres or less the
area shall be graded with a swale, at a minimum grade of 2.0% and a
minimum depth of 150 mm, to be covered with 20 mm Clear Stone to a
depth of 100 mm. This standard may be applied where the sideyard distances exceed 1.2 metres at the discretion of the Director,
Planning & Development.
38.
An undisturbed strip and/or flat area having a width of 0.6 metres shall
be provided within the boundary limits adjacent to other properties,
developed or undeveloped, in order that the existing boundary elevations
shall be maintained. Swales will not be permitted in this area. No filling
up to, or onto private lands shall be tolerated unless the abutting owner
furnishes written permission.
LG-4
39.
Rear yard catch basins are to be constructed in a minimum 3.0 metre
wide easement. Easements less than 3.0 metres will require the
approval of the Director, Planning & Development. The centre line of the
catch basin top is to be a minimum of 0.9 metres from any lot line and/or
line up with the centre line of the rear yard swale. All catch basin leads
are to be constructed entirely within the easement and no bends in the
leads will be permitted under any circumstances.
40.
If the plans are amended or altered after the Director,
Planning & Development has approved them; the date of the revision
shall be noted in the Revision Block and resubmitted to the
Director, Planning & Development for approval.
41.
The approved Tree Preservation Plan must be incorporated into the Lot
Grading Plans in order to facilitate approval of Lot Grading Plans. All
grading revisions that affect the tree preservation require prior approval
from the departments of Planning & Development and Community
Services.
42.
Provide "as built" hard copy drawing(s) showing the “as built” grading
elevations compared to the proposed grading elevations. The
drawing(s) must be supplied to the City within the six months
immediately following the sodding of the lot(s).
43.
Prior to assumption provide "as constructed" hard copy drawings on
mylar, indicating any variations from the “Approved Drawings”, and an
Autocad .dwg file on a compact disk in a current version of AutoCAD and
all digital supporting files related to the project (i.e., Softdesk Project
Files, Excel Spreadsheets, Access Databases, etc.).
Date of Original Issue:
January 1993
Date of Last Revision:
June 2012
LG-5