Alteration or relocation of watercourse:
(1) 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 municipality, and until all required permits or approvals have first been obtained from the Department of Environmental Protection's regional office.
(2) 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.
(3) In addition, FEMA and the 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 article and any other applicable codes, ordinances and regulations.
Within any identified floodplain area, no new construction or development shall be located within the area measured 50 feet landward from the top-of-bank of any watercourse.
For permitted uses in floodplain areas, see
§ 84-90.9E
For special exception uses in floodplain areas, see
§ 84-90.9F
Elevation and floodproofing requirements.
Within any identified floodplain area, any new construction or substantial improvements shall be prohibited unless otherwise provided for herein. If a use is permitted by right, by special exception or by variance, then the following provisions apply:
A. Residential structures.
(1) In AE, A1-30, and AH Zones, any new construction or substantial improvement shall have the lowest floor (including the basement) elevated up to, or above, the regulatory flood elevation.
(2) In A Zones, where there are no base flood elevations specified on the FIRM, any new construction or substantial improvement shall have the lowest floor (including the basement) elevated up to, or above, the regulatory flood elevation determined in accordance with this article.
(3) In AO Zones, any new construction or substantial improvement shall have the lowest floor (including the basement) at or above the highest adjacent grade at least as high as the depth number specified on the FIRM.
(4) The design and construction standards and specifications contained in the 2009 International Building Code (IBC) and in the 2009 International Residential Code (IRC), or the latest edition thereof adopted by the Commonwealth of Pennsylvania, and ASCE 24 and 34 Pa. Code (Chapters 401-405, as amended) shall be utilized, where they are more restrictive.
B. Nonresidential structures.
(1) In AE, A1-30 and AH Zones, any new construction or substantial improvement of a nonresidential structure shall have the lowest floor (including the basement) elevated up to, or above, the regulatory flood elevation or be designed and constructed so that the space enclosed below the regulatory flood elevation:
(a) Is floodproofed so that the structure is watertight with walls substantially impermeable to the passage of water; and
(b) Has structural components with the capability of resisting hydrostatic and hydrodynamic loads and effects of buoyancy.
(2) In A Zones, where no base flood elevations are specified on the FIRM, any new construction or substantial improvement shall have the lowest floor (including the basement) elevated or completely floodproofed up to, or above, the regulatory flood elevation determined in accordance with
§ 84-90.5C of this article.
(3) In AO Zones, any new construction or substantial improvement shall have its lowest floor elevated or completely floodproofed above the highest adjacent grade to at least as high as the depth number specified on the FIRM.
(4) Any nonresidential structure, or part thereof, made watertight below the regulatory flood elevation shall be floodproofed in accordance with the W1 or W2 space classification standards contained in the publication entitled "Flood-Proofing Regulations" published by the United States 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. There should be a statement submitted with the permit application and a statement submitted with the as-built floodproofing certificate prior to the issuance of the certificate of occupancy.
(5) Any nonresidential structure that will be floodproofed must submit the following to the floodplain administrator along with the nonresidential floodproofing certificate and prior to the issuance of the certificate of occupancy:
(a) An inspection and maintenance plan detailing the annual maintenance of floodproofed components ensuring that all components will operate properly under flood conditions. Components that must be inspected include, at a minimum:
[1] Mechanical equipment such as sump pumps and generators;
[2] Flood shields and closures;
[3] Walls and wall penetrations; and
[4] Levees and berms (as applicable).
(b) A flood emergency operation plan detailing the procedures to be followed during a flooding event, and must include information pertaining to how all components will operate properly under all conditions, including power failures. The design professional must produce the plan. An adequate plan must include the following:
[1] An established chain of command and responsibility with leadership responsibilities clearly defined for all aspects of the plan.
[2] A procedure for notification of necessary parties when flooding threatens and flood warnings are issued. Personnel required to be at the building should have a planned and safe means of ingress and should have no other emergency response duties during a flood event. Alternates should be assigned in the event that the primary persons responsible are unable to complete their assigned duties under the plan.
[3] A list of specific duties assigned to ensure that all responsibilities are addressed expeditiously. The locations of materials necessary to properly install all floodproofing components must be included in the list.
[4] An evacuation plan for all personnel or occupants, those without duties for the flood emergency as well as those with duties for implementing the plan. All possible ingress and egress routes must be identified.
[5] A periodic training and exercise program to keep personnel and occupants aware of their duties and responsibilities. Training drills should be held at least once a year and should be coordinated with community officials.
(6) The design and construction standards and specifications contained in the 2009 International Building Code (IBC) and in the 2009 International Residential Code (IRC), or the latest revision thereof as adopted by the Commonwealth of Pennsylvania, and ASCE 24 and 34 Pa. Code (Chapters 401-405, as amended) shall be utilized, where they are more restrictive.
Design and construction standards.
The following minimum standards shall apply for all construction and development proposed within any identified floodplain area:
A. Fill. Within any identified floodplain area, the use of fill shall be prohibited. If a variance is obtained, then the following provisions apply:
(1) If fill is used, it shall:
(a) Extend laterally at least 15 feet beyond the building line from all points;
(b) Consist of soil or small rock materials only; sanitary landfills shall not be permitted;
(c) Be compacted to provide the necessary permeability and resistance to erosion, scouring, or settling;
(d) Be no steeper than one vertical to two horizontal feet unless substantiated data justifying steeper slopes are submitted to, and approved by, the floodplain administrator; and
(e) Be used to the extent to which it does not adversely affect adjacent properties.
B. Drainage facilities. Storm drainage facilities shall be designed to convey the flow of stormwater runoff in a safe and efficient manner. The system shall ensure 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.
C. Water and sanitary sewer facilities and systems.
(1) All new or replacement water supply and sanitary sewer facilities and systems shall be located, designed and constructed to minimize or eliminate flood damages and the infiltration of floodwaters.
(2) Sanitary sewer facilities and systems shall be designed to prevent the discharge of untreated sewage into floodwaters.
(3) No part of any on-site waste disposal 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.
(4) The design and construction provisions of the UCC and FEMA No. 348, "Protecting Building Utilities From Flood Damages" and "The International Private Sewage Disposal Code" shall be utilized.
D. Other utilities. All other utilities such as gaslines, electrical and telephone systems shall be located, elevated (where possible) and constructed to minimize the chance of impairment during a flood.
E. Streets. The finished elevation of all new streets shall be no more than one foot below the regulatory flood elevation.
F. 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
§ 84-90.12: Development which may endanger human life, shall be stored at or above the regulatory flood elevation or floodproofed to the maximum extent possible.
G. 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.
H. Anchoring.
(1) All buildings and structures shall be firmly anchored in accordance with accepted engineering practices to prevent flotation, collapse, or lateral movement.
(2) 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.
I. Floors, walls and ceilings.
(1) 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.
(2) Plywood used at or below the regulatory flood elevation shall be of a marine or water-resistant variety.
(3) 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.
(4) Windows, doors, and other components at or below the regulatory flood elevation shall be made of metal or other water-resistant material.
J. Paints and adhesives.
(1) Paints and other finishes used at or below the regulatory flood elevation shall be of marine or water-resistant quality.
(2) Adhesives used at or below the regulatory flood elevation shall be of a marine or water-resistant variety.
(3) 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.
K. Electrical components.
(1) Electrical distribution panels shall be at least three feet above the base flood elevation.
(2) Separate electrical circuits shall serve lower levels and shall be dropped from above.
L. Equipment.
(1) Water heaters, furnaces, air-conditioning and ventilating units, and other electrical, mechanical or utility equipment or apparatus shall not be located below the regulatory flood elevation and shall be anchored to resist flotation, collapse, and lateral movement.
(2) Ductwork shall be elevated to or above the regulatory flood elevation or floodproofed to remain water-resistant.
M. 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.
N. Uniform Construction Code coordination. The standards and specifications contained in 34 Pa. Code (Chapters 401-405), as amended and not limited to the following provisions, shall apply to the above and other sections and subsections of this article, to the extent that they are more restrictive and supplement the requirements of this article.
(1) International Building Code (IBC) 2009 or the latest revision thereof as adopted by the Commonwealth of Pennsylvania: Sections 801, 1202, 1403, 1603, 1605, 1612, 3402, and Appendix G.
(2) International Residential Building Code (IRC) 2009 or the latest revision thereof as adopted by the Commonwealth of Pennsylvania: Sections R104, R105, R109, R322, Appendix E, and Appendix J.