[Ord. 2012-4, 6/21/2012, Art. IV, § 4.01]
The identified floodplain area shall be any areas of the Borough
of Hummelstown, classified as special flood hazard areas (SFHAs) in
the Flood Insurance Study (FIS) and the accompanying Flood Insurance
Rate Maps (FIRMs) dated August 2, 2012, and issued by the Federal
Emergency Management Agency (FEMA) or the most recent revision thereof,
including all digital data developed as part of the Flood Insurance
Study.
The above referenced FIS and FIRMs, and any subsequent revisions
and amendments are hereby adopted by the Borough of Hummelstown and
declared to be a part of this chapter.
[Ord. 2012-4, 6/21/2012, Art. IV, § 4.02]
1. The identified floodplain area shall consist of the following specific
areas:
A. Floodway Area.
(1)
Description. The area identified as floodway in the FIS which
represents the channel of a watercourse and the adjacent land areas
that must be reserved in order to discharge the base flood without
cumulatively increasing the water surface elevation by more than one
foot at any point.
|
This term shall also include floodway areas which have been
identified in other available studies or sources of information for
those special floodplain areas where no floodway has been identified
in the FIS.
|
(2)
Special Requirements.
(a)
Any encroachment that would cause any increase in flood heights
shall be prohibited.
(b)
No new construction or development shall be allowed, unless
a permit is obtained from the Department of Environmental Protection
Regional Office.
B. Special Floodplain Area.
(1)
Description. The areas identified as Zones AE and A1-30 in the
FIS which are subject to inundation by the 1% annual chance flood
event determined by detailed methods and have base flood elevations
(BFEs) shown.
(2)
Special Requirements.
(a)
No new construction or development shall be located within the
area measured 50 feet landward from the top-of-bank of any watercourse.
(b)
In special floodplain areas without a designated floodway, no
new development shall be permitted unless it can be demonstrated that
the cumulative effect of all past and projected development will not
increase the BFE by more than one foot.
C. Approximate Floodplain Area.
(1)
Description. The areas identified as Zone A in the FIS which
are subject to inundation by the 1% annual chance flood event determined
using approximate methodologies. Because detailed hydraulic analyses
have not been performed, no BFEs or flood depths are shown.
(2)
Special Requirements.
(a)
No new construction or development shall be located within the
area measured 50 feet landward from the top-of-bank of any watercourse.
(b)
When available, information from other federal, state, and other
acceptable sources shall be used to determine the BFE, as well as
a floodway area, if possible. When no other information is available,
the BFE shall be determined by using a point on the boundary of the
identified floodplain area which is nearest the construction site
in question.
|
In lieu of the above, the municipality may require the applicant
to determine the elevation with hydrologic and hydraulic engineering
techniques. Hydrologic and hydraulic analyses shall be undertaken
only by professional engineers or others of demonstrated qualifications,
who shall certify that the technical methods used correctly reflect
currently accepted technical concepts. Studies, analyses, computations,
etc., shall be submitted in sufficient detail to allow a thorough
technical review by the Borough.
|
D. Shallow Flooding Area.
(1)
Description. The areas identified as Zones AO and AH in the
FIS. These areas are subject to inundation by 1% annual chance shallow
flooding where average depths are between one and three feet.
(2)
Special Requirements. Establish drainage paths to guide floodwaters
around and away from structures on slopes.
[Ord. 2012-4, 6/21/2012, Art. IV, § 4.03]
The identified floodplain area may be revised or modified by
the Borough Council where studies or information provided by a qualified
agency or person documents the need for such revision. However, prior
to any such change, approval must be obtained from the FEMA. Additionally,
as soon as practicable, but not later than six months after the date
such information becomes available, a community shall notify the FEMA
of the changes by submitting technical or scientific data.
[Ord. 2012-4, 6/21/2012, Art. IV, § 4.04]
Should a dispute concerning any identified floodplain boundary
arise, an initial determination shall be made by the Borough of Hummelstown
Planning Commission and any party aggrieved by this decision or determination
may appeal to the Borough Council. The burden of proof shall be on
the appellant.