The identified floodplain area shall consist of the following specific areas:
1. Floodway area.
A. Description. 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.
B. Special requirements.
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. No new construction or development shall be allowed, unless a permit is obtained from the Department of Environmental Protection Regional Office.
2. Special floodplain area.
A. Description. 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.
B. AE Area without 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 but no floodway has been determined.
1. 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.
2. No permit shall be granted within any AE Zone without floodway, 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 development together with all other existing and anticipated development, would not result in an increase in flood levels of more than one foot within the entire community during the occurrence of the base flood discharge.
3. Approximate floodplain area.
A. Description. The areas identified as Zone A in the FIS which are subject to inundation by the l% annual-chance flood event determined using approximate methodologies. Because detailed hydraulic analyses have not been performed, no BFEs or flood depths are shown.
B. Special requirements.
1. 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.
2. 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 township.
(Ord. 1981-15-43, passed 12-14-1981; Ord. 2016-11-01, -passed 11-14-2016)