The identified floodplain area shall consist of the following
specific areas:
A. The Floodway Area shall be those areas identified in the FIS and
the FIRM as floodway and which represent the channel of a watercourse
and the adjacent land areas that must be reserved in order to discharge
the base flood without 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 flood hazard areas where no floodway
has been identified in the FIS and FIRM.
(1) Within any Floodway Area, no encroachments, including fill, new construction,
substantial improvements, or other development, shall be permitted
unless it has been demonstrated through hydrologic and hydraulic analysis
performed in accordance with standard engineering practice that the
proposed encroachment would not result in any increase in flood levels
within the community during the occurrence of the base flood discharge.
(2) Within any Floodway Area, no new construction or development shall
be allowed, unless the appropriate permit is obtained from the Department
of Environmental Protection's regional office.
B. The AE Area/District shall be those areas identified as an AE Zone
on the FIRM included in the FIS prepared by FEMA for which base flood
elevations have been provided.
(1) The AE Area adjacent to the floodway shall be those areas identified
as an AE Zone on the FIRM included in the FIS prepared by FEMA for
which base flood elevations have been provided and a floodway has
been delineated.
C. The A Area/District shall be those areas identified as an A Zone
on the FIRM included in the FIS prepared by FEMA and for which no
base flood elevations have been provided. For these areas, 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 municipality.
D. Community-identified flood hazard areas shall be those areas where
Borough of Denver has identified local flood hazard or ponding areas,
as delineated and adopted on a local flood hazard map using best available
topographic data and locally derived information, such as flood of
record, historic high-water marks, soils or approximate study methodologies,
including but not limited to:
(1) All land within the one-hundred- and five-hundred-year floodplain
identified on the latest FIRM by the United States Geological Survey
or the United States Army Corps of Engineers.
(2) All land delineated by the soil survey as possessing alluvial or
floodplain soils. The following soils (listed by map symbol and mapping
unit name) are the soils indicated as alluvial by the United States
Department of Agriculture's Soil Conservation Service in maps
and data comprising the Soil Survey, Lancaster County, Pennsylvania,
issued May, 1985, or any subsequent revision thereto:
|
Ac
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Alluvial land
|
|
BfA
|
Bowmansville silt loam, slopes of 0% to 6%
|
|
CfA
|
Chewacla silt loam, slopes of 0% to 3%
|
|
CmA
|
Congaree silt loam, slopes of 0% to 3%
|
|
HcA
|
Huntingdon fine sandy loam, slopes of 0% to 3%
|
|
HdA
|
Huntingdon silt loam, slopes of 0% to 3%
|
|
HeA
|
Huntingdon silt loam, local alluvium, slopes of 0% to 3%
|
|
LnA
|
Lindside silt loam, slopes of 0% to 3%
|
|
LoA
|
Lindside silt loam, local alluvium, slopes of 0% to 3%
|
|
LoB
|
Lindside silt loam, slopes 3% to 6%, except colluviums
|
|
MfA
|
Melvin silt loam, slopes of 0% to 3%
|
|
Rb
|
Riverwash
|
|
RcA
|
Roland and Bermudian silt loams, slopes of 0% to 3%
|
|
WcA
|
Wehadkee silt loam, slopes of 0% to 3%
|
(3) All land which has been flooded by floods of record.
(4) All additional land delineated by the following Subsection
E.
E. Where the complete and definitive information necessary to delineate the boundary of the floodplain area is not available to the Zoning Officer in his consideration of an application for a permit, he shall require such on-site studies and/or surveys to be made as are necessary to fix the precise boundaries of the floodplain area as defined in §§
114-16 and
114-17 above. Such studies and surveys shall be signed, sealed and certified by a licensed professional registered by the Commonwealth of Pennsylvania to perform such studies and surveys. Such certification shall acknowledge the accuracy of the study or survey and the qualification of the individual to perform such study or survey. Copies of such studies and surveys shall be submitted by the Zoning Officer to the Borough Engineer and the United States Department of Agriculture's Soil Conservation Service, who shall have 30 days to comment. Any property owner whose property is so studies and/or surveyed to justify an application for a permit shall pay all costs of these studies and surveys, except for work done under retainer to or on behalf of the Borough.
The identified floodplain area may be revised or modified by the Council where studies or information provided by a qualified agency or person documents the need for such revision. However, prior to any such change to the special flood hazard area, approval must be obtained from FEMA. Additionally, as soon as practicable, but not later than six months after the date such information becomes available, a community shall notify FEMA of the changes to the special flood hazard area by submitting technical or scientific data. See §
114-21B for situations where FEMA notification is required.
Prior to development occurring in areas where annexation or
other corporate boundary changes are proposed or have occurred, the
community shall review flood hazard data affecting the lands subject
to boundary changes. The community shall adopt and enforce floodplain
regulations in areas subject to annexation or corporate boundary changes
which meet or exceed those in 44 CFR 60.3.