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Township of Lower Gwynedd, PA
Montgomery County
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Table of Contents
Table of Contents
The following uses and no others shall be permitted by right in the Floodplain Conservation District in compliance with the requirements of this article:
(a) 
Cultivation and harvesting of crops in accordance with recognized soil conservation practices;
(b) 
Pasture and grazing land in accordance with recognized soil conservation practices;
(c) 
Outdoor plant nurseries or orchards in accordance with recognized soil conservation practices;
(d) 
Wildlife sanctuaries, woodland preserves, arboretums and passive recreation or parks, including hiking, bicycle and bridle trails, but not including facilities subject to damage by flooding;
(e) 
Forestry lumbering and reforestation in accordance with recognized natural resource conservation practices, but permitting structures;
(f) 
Utility transmission lines;
(g) 
Sealed public water supply wells and pipelines, with approval of proper state agencies;
(h) 
Sanitary sewers and storm sewers, with approval of proper state agencies and the Township Engineer;
(i) 
Front, side and rear yards and the required lot area for any district; and
(j) 
Public roadways, with approval of applicable state agencies and the Board of Supervisors.
Any use or activity not authorized within Section 1290.12, herein, shall be prohibited within the Floodplain Conservation District and the following activities and facilities are specifically prohibited:
(a) 
Freestanding structures, buildings, mobile homes, manufactured homes, recreational vehicles, retaining walls and any grading or filling, with the exception of flood retention dams, as approved by the Pennsylvania Department of Environmental Protection and the Township Engineer;
(b) 
The relocation of any watercourse, without the approval of the Board of Supervisors or without a permit from the Pennsylvania Department of Environmental Protection. Where an encroachment permit is required by the Department, such permit application shall be forwarded to any affected adjacent municipality, the Pennsylvania Department of Community and Economic Development and the Federal Emergency Management Agency (FEMA) 30 days prior to any hearing or formal Board action;
(c) 
Sanitary landfills, dumps, junkyards, outdoor storage of vehicles and miscellaneous materials or storage of any buoyant, toxic or dangerous materials;
(d) 
On-site sewage disposal systems;
(e) 
Private water supply wells;
(f) 
Paved or all-weather parking lots, private roads and driveways;
(g) 
Encroachments or any development in the Floodway Area/District that would cause any rise in the one-hundred-year (one-percent-annual-chance) base flood elevation; and
(h) 
Stripping of topsoil, ground cover or vegetation, or the removal of trees within 20 feet of a stream bank.
The following uses shall be banned in any FP Floodplain Conservation District and no variance thereto shall be granted:
(a) 
Any new or substantially improved structure which will be used for the production or storage of any of the following dangerous materials or substances, or which will be used for any activity requiring the maintenance of a supply of more than five gallons, or other comparable volume, of any other of the following dangerous materials or substances, on the premises or will involve the production, storage, or use of any amount of a radioactive substance:
(1) 
Acetone.
(2) 
Ammonia.
(3) 
Benzene.
(4) 
Calcium carbide.
(5) 
Carbon disulfide.
(6) 
Celluloid.
(7) 
Chlorine.
(8) 
Hydrochloric acid.
(9) 
Hydrocyanic acid.
(10) 
Magnesium.
(11) 
Nitric acid and oxides of nitrogen.
(12) 
Petroleum products (gasoline, fuel oil, etc.).
(13) 
Phosphorus.
(14) 
Potassium.
(15) 
Sodium.
(16) 
Sulfur and sulfur products.
(17) 
Pesticides (including insecticides, fungicides, and rodenticides).
(18) 
Radioactive substances, insofar as such substances are not otherwise regulated.
(b) 
The construction, enlargement or expansion of any structure used or intended to be used for any of the following:
(1) 
Hospitals.
(2) 
Nursing homes.
(3) 
Jails or prisons.
(c) 
The commencement of or any construction of a new manufactured home park or manufactured home subdivision or any substantial improvement to an existing manufactured home park or manufactured home subdivision.
All subdivision proposals and development proposals containing at least 50 lots or at least five acres, whichever is the lesser, proposed to be entirely or partially located within flood hazard areas where base flood elevation data are not available, shall be supported by hydrologic and hydraulic engineering analyses that determine base flood elevations and floodway information. The analyses shall be prepared by a licensed professional engineer in a format required by FEMA for a conditional letter of map revision or letter of map revision. Submittal requirements and processing fees shall be the responsibility of the applicant.
The provisions of this Ordinance do not require any changes or improvements to be made to lawfully existing structures. However, when an improvement is made to any existing structure, the provisions of Section 1290.17 of this ordinance and Chapter 1296, Nonconforming Uses, shall apply.
The following provisions shall apply whenever any improvement is made to an existing structure located within any Floodplain Conservation District:
(a) 
No expansion or enlargement of an existing structure shall be allowed within any Floodway Area that would cause any increase in the elevation of the base flood elevation and the appropriate permit is obtained from the Department of Environmental Protection Regional Office.
(b) 
No expansion or enlargement of an existing structure shall be allowed within any AE Area/District without floodway, as defined in Section 1290.08(b), that would, together with all other existing and reasonably anticipated development, increase the BFE more than one foot at any point.
(c) 
Within any AE Area/District without a floodway, no new construction or development shall be located within the area measured 50 feet landward from the top-of-bank of any watercourse, unless the appropriate permit is obtained from the Department of Environmental Protection Regional Office.
(d) 
Any modification, alteration, reconstruction, or improvement, of any kind to an existing structure, to an extent or amount of 50% or more of its market value, shall constitute a substantial improvement and shall be undertaken only in full compliance with the provisions of this Ordinance.
(e) 
Historic structures undergoing repair or rehabilitation that would constitute a substantial improvement as defined in this ordinance must comply with all chapter requirements that do not preclude the structure's continued designation as an historic structure. Documentation that a specific chapter requirement will cause removal of the structure from the National Register of Historic Places or the State Inventory of Historic Places must be obtained from the Secretary of the Interior or the State Historic Preservation Officer. Any exemption from the chapter requirements will be the minimum necessary to preserve the historic character and design of the structure.
(f) 
The above activity shall also address the requirements of the 34 Pa. Code, as amended, and the 2009 IBC and the 2009 IRC or latest revisions thereof.
(g) 
Any modification, alteration, reconstruction or improvement of any kind to an existing structure, to an extent or amount of less than 50% of its market value, shall be elevated and/or floodproofed to the greatest extent possible.