A. The following uses shall be permitted by conditional use when authorized by the Board of Supervisors, subject to the standards set forth below, and if contemplated within the Floodway, do not cause an increase in the water surface of the one-hundred-year flood:
1. Water lines and sealed public water supply wells with the approval of the Township Engineer and the Pennsylvania Department of Environmental protection.
2. Utility transmission lines.
3. Front, side and rear yards and required lot areas in any district, provided that such yards and areas are not to be used for on-site sewage disposal systems, and provided that no fences, retaining walls or other structures be installed that could effectively collect floating debris during periods of flooding.
4. Storm sewer outlet and sanitary sewer treatment plant outlet, with the approval of the Township Engineer, appropriate sewer authorities and other appropriate governmental authorities, provided that the construction is floodproofed.
5. Dams and impoundment basins, where approved by appropriate public agencies.
6. Water-related uses and activities such as marinas, docks, wharves, piers, etc.
7. Temporary uses such as circuses, carnivals and similar activities.
8. Storage of materials and equipment, provided that they are not buoyant, flammable or explosive and are not subject to major damage by flooding or subject to the provisions in § 208-1412 of this chapter.
9. Extraction of sand, gravel and other materials.
10. Expansion of existing buildings or structures. When permitted as a conditional use by the Board of Supervisors, any building or structure within the Floodplain (FP) District at the time of enactment of this chapter may be altered or extended, provided that:
(a) Existing structures located in a designated Floodway subdistrict or area shall not be expanded or enlarged, unless the effect of the proposed expansion or enlargement on flood heights is fully offset by accompanying improvements.
(b) Any modification, alteration, reconstruction or improvement of any kind to an existing structure to an extent or amount of less than fifty percent (50%) of its market value shall be elevated and/or floodproofed to the greatest extent possible.
(c) Any modification, alteration, reconstruction or improvement of any kind to an existing structure to an extent or amount of less than fifty percent (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 chapter.
(d) Not withstanding any of the above, any increase in volume or area shall not exceed an aggregate of more than twenty-five percent (25%) of such volume or area during the life of the structure.
(e) No increase of any on-lot sewer system presently located either wholly or partially in the Floodplain (FP) District shall be permitted.
