The following minimum subdivision principles, standards, and requirements will be applied by the Planning Commission, the Borough Council, Borough staff and consultants hired to provide comment in evaluating applications for preliminary and final plat approval.
A. 
Land shall be suited for the purpose for which it is to be subdivided.
B. 
Land subject to hazards of life, health, and safety, such as strip- or surface-mined land, quarry land, open ditches and land subject to flooding or subsidence, shall not be subdivided for residential purposes until all such hazards have been eliminated or unless guarantee is given that adequate safeguards against such hazards are provided by the subdivision plat.
A. 
Proposed streets shall be properly related to Borough, county and state road and highway plans which have been prepared and officially adopted and/or filed as prescribed by law.
B. 
Streets shall be logically related to the topography so as to produce usable lots and reasonable grades.
C. 
Local streets shall be so laid out in curvilinear fashion where practical, so as to discourage through traffic, but provisions for street connections into and from adjacent areas will be generally required.
D. 
Where a subdivision plat abuts or contains an existing or proposed arterial street, the Planning Commission and Borough Council may require local access streets, reverse frontage lots, or such other treatment which will provide protection for abutting properties, reduction in the number of intersections with arterial streets, and separation of local and through traffic.
E. 
New half or partial streets will not be permitted, except where essential to reasonable subdivision of a tract in conformance with the other requirements and standards of this chapter and where, in addition, satisfactory assurance for dedication of the remaining part of the street can be secured.
F. 
Wherever a tract to be subdivided borders an existing half or partial street, the unimproved part of the street shall be plotted within such tract. The cost of said improvements shall be borne equally by the developer/subdivider and the Borough.
G. 
Cul-de-sac end streets may be permitted when it is clear that through traffic at such a street end is not essential to the street system in that district, or to the development of adjacent properties in the area, or the topography of the ground prohibits the future extension of the streets. The maximum length of a cul-de-sac street shall be 800 lineal feet, exclusive of the turnaround portion.
(1) 
A turnaround with a cartway diameter of 80 feet, with a right-of-way diameter of 100 feet, shall be required at the end of all streets.
(2) 
Unless future extension is clearly impracticable or undesirable, the turnaround right-of-way shall be placed adjacent to a property line, and a right-of-way of the same width as the street shall be carried to the property line in such a way as to permit future extension of the street into an adjoining tract.
H. 
If lots resulting from original subdivision are large enough to permit resubdivision, or if a portion of the tract is not subdivided, adequate street right-of-way to permit further resubdivision shall be provided as necessary.
I. 
Reserve strips, restricting or controlling access to adjacent streets or properties, shall be prohibited.
J. 
Maximum allowable grades, center line of streets:
(1) 
Arterial streets: 6%.
(2) 
Collector streets: 10%.
(3) 
Local streets: 12%.
K. 
Culs-de-sac. The maximum grade of the turnaround pavement portion of the cul-de-sac shall be 5%.
L. 
Minimum grades on all streets shall not be less than 1%.
M. 
Vertical curves of proper and adequate length shall be installed on all street grade changes exceeding 1% and provide a minimum sight distance as follows:
Design speed = 60 mph
Arterial streets
500 feet
Design speed = 40 mph
Collector streets
275 feet
Design speed = 30 mph
Local streets
200 feet
A. 
Whenever street lines are deflected in excess of 2°, connection shall be made by horizontal curves.
B. 
To ensure adequate sight distance, minimum center-line radii for horizontal curves shall be as follows:
Design speed = 60 mph
Arterial streets
1,000 feet
Design speed = 40 mph
Collector streets
400 feet
Design speed = 30 mph
Local streets
100 feet
A. 
Minimum street right-of-way widths and cartway (roadway) widths shall be as follows:
Type of Street
Cartway
(feet)
Right-of-Way
(feet)
Arterial
40
60
Collector
26
50
Local
24
50
B. 
Additional right-of-way and cartway widths may be required by the Borough Council for the following purposes:
(1) 
To promote public safety and convenience.
(2) 
To provide parking space in commercial districts and in areas of high-density residential development.
(3) 
Where a subdivision abuts or contains an existing street of inadequate right-of-way width, additional right-of-way width in conformation with above standards may be required.
(4) 
Where anticipated traffic flows and vehicle size warrants additional widths, increases in base material and cartway widths will be established by the Planning Commission and the Borough Engineer.
A. 
Curbs, where required, shall be installed by the subdivider along the streets or where deemed necessary for public safety as determined by the Borough Council. The curbs shall be of the type and material as specified and approved by the Borough Council. All curbs at intersections shall be rounded by a minimum radius of 25 feet for local streets, 30 feet for collector streets, and 40 feet for arterial streets.
B. 
Where the grade of any street at the approach to an intersection exceeds 5%, a leveling area shall be provided with a transitional grade not to exceed 2% for a distance of 25 feet from the nearest right-of-way line of the intersection.
C. 
Multiple intersection of more than four roads shall be prohibited.
D. 
Street offsets. Street offsets of less than 125 feet shall be avoided.
E. 
Reverse curves. Reverse curves shall be designed to accommodate anticipated volumes of traffic at designed speeds.
A. 
Alleys are not permitted in residential areas.
B. 
Alleys are permitted in commercial and industrial areas, subject to design approval of the Planning Commission and Borough Council.
A. 
Driveways shall be located to provide the best visibility possible within the limits of the property that each driveway serves and shall be designed and constructed in accordance with the requirements of the Borough.
B. 
Private driveways which function as local streets providing access to individual residential lots shall be designed in accordance with this article and in compliance with the minimum standards for public streets.
A. 
Residential lots shall be subdivided in accordance with the terms of Chapter 375, Zoning, of the Code of the Borough of Slippery Rock and the provisions contained herein.
B. 
Subdivision and development of land other than for residential purposes shall be subject to review by the Planning Commission and the Borough Council insofar as size, depth, width of lots, access to public roads and parking are concerned.
C. 
The frontage width of lots fronting a cul-de-sac shall be a minimum of 50 feet at the right-of-way line. The side yard setback requirements will be calculated from the front of the structure and extended from both sides of the structure to the side property lines.
D. 
All lot lines shall be set perpendicular or radial to the center line of the street whenever possible. All nonradial lines shall be denoted as such on the plat.
E. 
Lots abutting local streets shall front upon the streets which parallel the long dimension of the block, if possible.
F. 
Where two such vehicular access areas abut one another, a combined driveway shall be required to a distance of 150 feet. The minimum twenty-foot width may be reduced to 15 feet on each lot.
G. 
Lots proposed as flag lots shall not be recommended for approval by the Planning Commission and/or approved by the Borough Council unless the developer/subdivider can demonstrate that a modification is warranted in accordance with the following provisions:
[Amended 9-20-2011 by Ord. No. 659]
(1) 
The extended portion of the flag lot shall have a minimum frontage of 50 feet at the right-of-way line.
(2) 
A maximum of two additional lots shall be accessible via the extended portion of the lot.
(3) 
The extended portion of the lot shall be included in the area calculation of the lot being accessed.
The building lines shall be in accordance with the terms of Chapter 375, Zoning, of the Code of the Borough of Slippery Rock.
A. 
Block length shall not exceed 1,200 feet nor be less than 500 feet.
B. 
Blocks shall be at least two lots in depth, except for reverse frontage lots.
C. 
Exceptionally long blocks shall be provided with crosswalks with a minimum right-of-way reservation of 12 feet and a four-foot paved walk.
D. 
The depth-to-width ratio of usable lot length shall be at a maximum of 2 1/2 to one.
A. 
Easements for sanitary sewer and stormwater sewer shall have a minimum width of 20 feet and be placed at the side or rear of lots whenever possible. When the Borough Council determines that easements are required to extend proposed or future utilities, the required easements shall be provided.
B. 
Anchor easements shall be approximately four feet by 30 feet and placed on a lot line, at such locations as deemed appropriate by the utility requiring such easements.
C. 
Aerial easements shall be a minimum of 15 feet and located as deemed appropriate by the utility requiring such easements.
D. 
Where a subdivision is traversed by a watercourse, there shall be provided a drainage easement or right-of-way conforming substantially with the line of such watercourse and of such width as will be adequate to preserve the natural flow of water and to provide sufficient width for maintenance, but not less than 20 feet.
Reserve strips surrounding the property or areas reserved for any purpose which shall make any area unprofitable for regular or special assessments or which may revert to untended nuisance areas will not be approved by the Planning Commission and the Borough Council.
The subdivider may choose his street names subject to the approval of the Planning Commission and the Borough Council. No street, other than an extension, may be given the name of an existing street in the Borough of Slippery Rock postal service area of which the Borough of Slippery Rock is a part.
In subdividing land, it shall be done in a manner that will not have the effect of barring adjacent property owners from access to the streets and ways of the allotment.