At all changes of street grades where the algebraic difference
exceeds 1%, vertical curves shall be provided to permit the following
minimum sight distance:
B. Collector streets: 300 feet.
The length, width and shape of blocks shall be determined with
due regard to:
A. Provision of adequate sites for buildings of the type proposed.
C. Topography and other natural features.
D. Requirements for safe and convenient vehicular and pedestrian circulation,
including the reduction of intersections with major streets.
Residential blocks shall be of sufficient depth to accommodate
two tiers of lots, except:
A. Where reverse frontage lots are required along a major traffic street;
or
B. Where prevented by the size, topographical conditions or other inherent
conditions of property, in which case the Borough Planning Commission
may approve a single tier of lots.
Driveways constructed
within street rights-of-way shall be subject to the following requirements:
A. Private driveways on corner lots shall be located at least 25 feet
from the point of intersection of the nearest street right-of-way
lines.
B. In order to provide a safe and convenient means of access, grades
on private driveways should not exceed 14%. In addition, driveways
should be paved where grades exceed 7%.
C. In order to provide safe and convenient ingress and egress, private
driveway entrances should be rounded at a minimum radius of five feet,
or should have a flare constructed that is equivalent to this radius,
at the point of intersection with the cartway edge (curbline).
All applications for land development or subdivision shall include
stormwater management data in a form acceptable to Borough Council
in conformance with the criteria for stormwater management as described
in the Lancaster County Subdivision and Land Development Ordinance
of 1991, as amended. In addition to the provisions of said ordinance,
the following additional provisions shall apply:
A. Stormwater management facilities shall be provided so that the peak
discharge of the calculated post-development runoff to an adjacent
property does not exceed 50% of the peak discharge of the calculated
predevelopment runoff, and so as to:
[Amended 12-7-1998 by Ord. No. 315]
(1)
Permit unimpeded flow of natural watercourses.
(2)
Ensure adequate drainage of all low points along the line of
streets.
(3)
Intercept stormwater runoff along streets at intervals related
to the extent and grade of the area drained.
(4)
Provide positive drainage away from on-site sewage disposal
facilities.
B. The calculated peak discharge for stormwater originating on the project
site must meet the following conditions for all watersheds flowing
from the project site:
[Amended 12-7-1998 by Ord. No. 315]
(1)
The two-year post-development peak discharge must be less than
or equal to 50% of the two-year predevelopment peak discharge;
(2)
The ten-year post-development peak discharge must be less than
or equal to 50% of the ten-year predevelopment peak discharge;
(3)
The twenty-five-year post-development peak discharge must be
less than or equal to 50% of the twenty-five-year predevelopment peak
discharge;
(4)
The fifty-year post-development peak discharge must be less
than or equal to 50% of the fifty-year predevelopment peak discharge;
(5)
The one-hundred-year post-development peak discharge must be
less than or equal to 50% of the one-hundred-year predevelopment peak
discharge.
C. Storm sewers and related installations shall be required only when
the runoff stormwater cannot be satisfactorily handled within the
street cartway.
D. Where existing storm sewers are reasonably accessible, proposed subdivisions
shall be required, if necessary, to connect therewith.
E. In the design of storm drainage facilities, special consideration
shall be given to avoidance of problems that may arise from the concentration
of stormwater runoff onto adjacent developed or undeveloped properties.
F. Storm drainage facilities should be designed not only to handle the
anticipated peak discharge from the property being subdivided, but
also the anticipated increase in runoff that will occur when all the
property at a higher elevation in the same watershed is fully developed.
G. Where a subdivision is traversed by a watercourse, drainageway, channel,
or stream, there shall be provided a drainage easement conforming
substantially with the line of such watercourse, adequate to preserve
the unimpeded flow of natural drainage, or for the purpose of widening,
deepening, relocating, improving or protecting such drainage facilities.
Any changes in the existing drainage way shall be subject to the approval
of the Pennsylvania Water and Power Resources Board.
H. All streets shall be so designed as to provide for the discharge
of surface water from their rights-of-way.
I. The slope of the crown on proposed streets shall not be less than
1/8 inch per foot and not more than 1/3 inch per foot.
J. Adequate facilities shall be provided at low points along streets
and where necessary to intercept runoff.
Consideration shall be shown for all natural features, such
as large trees, watercourses, historic areas and structures, and similar
community assets that, if preserved, will add attractiveness and value
to the remainder of the subdivision. Trees shall be preserved wherever
possible.