All driveways and related improvements shall be constructed and located
in such a manner as to not impair drainage or maintenance within street
rights-of-way, alter the stability of a roadway or subgrade, materially
change the drainage paths of the area, interfere with the traveling
public, present a hazard to the movement of normal street traffic,
or create or contribute to undue traffic congestion. Where an existing
roadside drainage swale is too shallow to permit installation of a
driveway pipe, a concrete trench box with grate or an alternate stormwater
conveyance structure (collectively "alternate conveyance structure")
approved by the Township Engineer shall be required to be installed
following an inspection by the Township Engineer and after consideration
of existing site conditions. A plan for the construction and installation
of the alternate conveyance structure must be approved by the Township
Engineer. It shall be the responsibility of the property owner to
keep the driveway pipe or alternate conveyance structure free from
debris and blockage which could impede the flow of water, thus causing
flooding of the roadway. In the event the property owner fails to
keep the pipe or alternative conveyance structure free of debris which
impedes the flow of water, the Township shall notify the property
owner to clear the impediment. If the owner fails to clear the impediments
after seven days' notice from the Township, the Township will
reopen the pipe or alternative conveyance structure at the owner's
expense. The pipe or alternative conveyance structure shall be sized
to convey flow from a twenty-five-year storm without runoff overtopping
the driveway or entering the cartway of the street. The minimum pipe
size shall be 15 inches and shall be made of reinforced concrete (RCP)
unless the Permit Administrator or Township Engineer approves an alternative
material. The Township may require a means of reducing blockage, such
as installation of a trashrack or similar device, if it feels materials
are likely to block the pipe or drain. Appropriate erosion, protection,
such as riprap, may be required by the Township. Within a state-owned
right-of-way, approval from PennDOT will be required.