No encroachment, alteration, or improvement of any kind shall be made to any watercourse until all adjacent municipalities which may be affected by such action have been notified by the Borough and until all required permits or approvals have been first obtained from the Department of Environmental Protection.
In addition, the Federal Emergency Management Agency and Pennsylvania Department of Community and Economic Development shall be notified prior to any alteration or relocation of any watercourse.
Any new construction, development, uses or activities allowed within any identified floodplain area shall be undertaken in strict compliance with the provisions contained in this chapter and any other applicable codes, ordinance and regulations.
Within the identified floodplain area (AE), no new construction or development shall be allowed unless it is demonstrated that the cumulative effect of the proposed development, when combined with all other existing and anticipated development, will not increase the elevation of the one-hundred-year flood more than one foot at any point.
Submit technical or scientific data to FEMA for a letter of map revision (LOMR) within six months of the completion of any new construction, development, or other activity resulting in changes in the BFE.
No encroachment, alteration, or improvement of any kind shall be made to any watercourse unless it can be shown that the activity will not reduce or impede the flood-carrying capacity of the watercourse in any way.
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.
Within the identified floodplain area (AE), the following provisions shall apply:
No new construction or development shall be located within the area measured 50 feet landward from the top-of-bank of any watercourse, unless a permit is obtained from the Department of Environmental Protection.
Residential structures. Within any FW, FF, or FA, the lowest floor (including basement) of any new or substantially improved residential structure shall be at least 1 1/2 feet above the one-hundred-year flood elevation. The design and construction standards and specifications contained in the 2006 International Building Code (IBC) and in the 2006 International Residential Code (IRC) or the most recent revisions thereof and ASCE 24 and 34 Pa. Code (Chapters 401 to 405, as amended) shall be utilized.
Within any FW, FF, or FA, the lowest floor (including basement) of any new or substantially improved nonresidential structure shall be at least 1 1/2 feet above the one-hundred-year flood elevation or be designed and constructed so that the space enclosed by such structure shall remain either completely or essentially dry during any flood up to that height.
Any nonresidential structure, or part thereof, made watertight below the regulatory flood elevation shall be floodproofed in accordance with the WI or W2 space classification standards contained in the publication entitled "Flood-Proofing Regulations" published by the U.S. Army Corps of Engineers (June 1972, as amended March 1992) or with some other equivalent standard. All plans and specifications for such floodproofing shall be accompanied by a statement certified by a registered professional engineer or architect which states that the proposed design and methods of construction are in conformance with the above-referenced standards.
Fully enclosed areas below the lowest floor (excluding basements) which will be used solely for the parking of a vehicle, building access, or incidental storage in an area other than a basement shall be designed to automatically equalize hydrostatic flood forces on exterior walls by allowing for the entry and exit of floodwaters. The term "fully enclosed space" also includes crawl spaces. Designs for meeting this requirement must either be certified by a registered professional engineer or architect or meet or exceed the following minimum criteria: A minimum of two openings having a total net area of not less than one square inch for every square foot of enclosed area subject to flooding shall be provided. The bottom of all openings shall be no higher than one foot above grade. Openings may be equipped with screens, louvers, valves, or other coverings or devices, provided that they permit the automatic entry and exit of floodwaters.
The following standards shall apply for all construction and development proposed within any identified floodplain area:
Fill. If fill is used, it shall:
Extend laterally at least 15 feet beyond the building line from all points.
Consist of soil or small rock materials only. Sanitary landfills shall not be permitted.
Be compacted to provide the necessary permeability and resistance to erosion, scouring, or settling.
Be no steeper than one vertical to two horizontal, unless substantiated data, justifying steeper slopes, are submitted to and approved by the Zoning Officer.
Be used to the extent to which it does not adversely affect adjacent properties.
Drainage. Storm drainage facilities shall be designed to convey the flow of stormwater runoff in a safe and efficient manner. The system shall insure proper drainage along streets and provide positive drainage away from buildings. The system shall also be designed to prevent the discharge of excess runoff onto adjacent properties.
Water and sanitary sewer facilities and systems.
All new or replacement water and sanitary sewer facilities and systems shall be located, designed and constructed to minimize or eliminate flood damages and the infiltration of floodwaters.
Sanitary sewer facilities and systems shall be designed to prevent the discharge of untreated sewage into floodwaters.
No part of any on-site sewage system shall be located within any identified floodplain area except in strict compliance with all state and local regulations for such systems. If any such system is permitted, it shall be located so as to avoid impairment to it, or contamination from it, during a flood.
Other utilities. All other utilities such as gas lines, electrical and telephone systems shall be located, elevated (where possible), and constructed to minimize the chance of impairment during a flood.
Streets. The finished elevation of all new streets shall be no more than one foot below the regulatory flood elevation.
Storage. All materials that are buoyant, flammable, explosive or, in times of flooding, could be injurious to human, animal, or plant life, and not listed in § 154-405, Development which may endanger human life, shall be stored at or above the regulatory flood elevation and/or floodproofed to the maximum extent possible.
Placement of buildings and structures. All buildings and structures shall be designed, located and constructed so as to offer the minimum obstruction to the flow of water and shall be designed to have a minimum effect upon the flow and height of floodwater.
All buildings and structures shall be firmly anchored in accordance with accepted engineering practices to prevent flotation, collapse or lateral movement.
All air ducts, large pipes, storage tanks, and other similar objects or components located below the regulatory flood elevation shall be securely anchored or affixed to prevent flotation.
Floors, walls and ceilings.
Wood flooring used at or below the regulatory flood elevation shall be installed to accommodate a lateral expansion of the flooring, perpendicular to the flooring grain, without causing structural damage to the building.
Plywood used at or below the regulatory flood elevation shall be of a "marine" or "water-resistant" variety.
Walls and ceilings at or below the regulatory flood elevation shall be designed and constructed of materials that are water resistant and will withstand inundation.
Windows, doors, and other components at or below the regulatory flood elevation shall be made of metal or other water-resistant material.
Paints and adhesives.
Paints or other finishes used at or below the regulatory flood elevation shall be of a "marine" or "water-resistant" quality.
Adhesives used at or below the regulatory flood elevation shall be of a "marine" or "water-resistant" quality.
All wooden components (doors, trim, cabinets, etc.) used at or below the regulatory flood elevation shall be finished with a "marine" or "water-resistant" paint or other finishing material.
Equipment. Water heaters, furnaces, air-conditioning and ventilation units, and other electrical, mechanical, or utility equipment or apparatus shall not be located below the regulatory flood elevation.
Fuel supply systems. All gas and oil supply systems shall be designed to prevent the infiltration of floodwaters into the system and discharges from the system into floodwaters. Additional provisions shall be made for the drainage of these systems in the event that floodwater infiltration occurs.
Uniform Construction Code coordination. The standards and specifications contained 34 Pa. Code (Chapters 401 to 405), as amended and not limited to the following provisions, shall apply to the above and other sections and subsections of this chapter, to the extent that they are more restrictive and supplement the requirements of this chapter.
Enclosed space below the lowest floor. Enclosed space below the lowest floor (including basement) may be permitted, provided that such space shall be designed to automatically equalize hydrostatic flood forces on exterior walls by allowing for entry and exit of floodwater. Designs for meeting this requirement must either be certified by a registered professional engineer or architect or meet or exceed the following minimum criteria:
At least two openings shall be provided having a total net open area of at least one square inch for every square foot of enclosed space subject to flooding.
The bottom of all openings shall be no higher than one foot above grade.
Openings may be equipped with screens, louvers, or other coverings or devices, provided that they permit the automatic entry and exist of floodwaters.
In accordance with the Pennsylvania Flood Plain Management Act, 32 P.S. § 679.101 et seq., and the regulations adopted by the Department of Community and Economic Development as required by the Act, any new or substantially improved structure which will be used for the production or storage of any of the following dangerous materials or substances; will be used for any activity requiring the maintenance of a supply of more than 550 gallons, or other comparable volume, of any of the following dangerous materials or substances on the premises; will involve the production, storage, or use of any amount of radioactive substances, shall be subject to the provisions of this section, in addition to all other applicable provisions. The following list of materials and substances are considered dangerous to human life:
Nitric acid and oxides of nitrogen.
Petroleum products (gasoline, fuel oil, etc.).
Sulphur and sulphur products.
Pesticides (including insecticides, fungicides, and rodenticides).
Radioactive substances, insofar as such substances are not otherwise regulated.
Within any FW (Floodway), any structure of the kind described above shall be prohibited.
Where permitted within any FF (Flood-Fringe Area) or FA (General Floodplain Area), any structure of the kind described above shall be:
Any such structure, or part thereof, that will be built below the regulatory flood elevation shall be designed and constructed in accordance with the standards for completely dry floodproofing contained in the publication "Flood-Proofing Regulations" (U.S. Army Corps of Engineers, June 1972), or with some other equivalent watertight standard.
Within any identified floodplain area, all manufactured homes and any additions thereto shall be prohibited within the area measured 50 feet landward from the top-of-bank of any watercourse.
Where permitted within any identified floodplain area, all manufactured homes and additions thereto shall be:
Installation of manufactured homes shall be done in accordance with the manufacturers' installation instructions as provided by the manufacturer. Where the applicant cannot provide the above information, the requirements of Appendix E of the 2006 International Residential Building Code or the U.S. Department of Housing and Urban Development's Permanent Foundations for Manufactured Housing, 1984 Edition, draft or latest revision thereto, shall apply and 34 Pa. Code Chapters 401 to 405.
Consideration shall be given to the installation requirements of the 2006 IBC and the 2006 IRC or the most recent revisions thereto and 34 Pa. Code, as amended where appropriate and/or applicable to units where the manufacturers' standards for anchoring cannot be provided or were not established for the units(s) proposed installation.
Recreational vehicles in Zones A1-30, AH and AE must either:
For all subdivision proposals and development proposals containing at least 50 lots or at least five acres, whichever is the lesser, in flood hazard areas where base flood elevation data is not available, such proposals shall be in strict conformity with the provisions of the Subdivision and Land Development Ordinance, contained in Chapter 258 of the Code of the Borough of Chambersburg, as amended from time to time.