[HISTORY: Adopted by the City Council of the City of Harrisburg by Ord. No. 23-1990. Amendments noted where applicable.]
Construction in floodplain district: see Ch. 8-101 (IBC Appendix K).
Floodplain zoning: see Ch. 7-329.
Any proposed subdivision or land development which is located in the floodplain zoning districts of the City as created by Chapter 7-329 of the Zoning Code shall comply with this chapter of the Harrisburg Subdivision and Land Development Code.
The purpose of these special provisions is to:
Regulate the subdivision and land development of flood hazard areas in order to promote the general health, welfare and safety of the community.
Require that each subdivision and land development lot in a flood hazard area be provided with a safe building site with adequate access and that public facilities and/or improvements which serve such structures and uses be designed and installed at the time of initial construction to minimize flood damage.
Protect individuals from buying lands which are unsuitable for use because of flood hazards by regulating the subdivision of unprotected land.
Plan requirements and processing procedures as stipulated in Chapter 7-503 of this Subdivision and Land Development Code shall remain in full effect; however, the following additional requirements shall be applicable to any preliminary plan for land to be subdivided or developed which is located in the floodplain zoning districts of the City and shall be prepared by a registered engineer or surveyor:
A map showing the location of the proposed subdivision or land development with respect to the floodplain zoning districts of the City, including information on, but not limited to, the regulatory flood elevation, the boundaries of the floodplain zoning districts of the City, proposed lots and sites, fills, flood or erosion protection structures or improvements, and areas subject to special deed restrictions.
The preliminary plan shall include detailed information giving the location and elevation of proposed roads, public utilities and building sites and shall show topographical contours at intervals of two feet.
The final plan shall contain all the floodplain information as is required by the preliminary plan.
The Planning Commission shall notify adjacent communities and the State Coordinating Office prior to any alteration or relocation of a watercourse and submit copies of such notification to the Federal Insurance Administration prior to approval of the final plan.
Design standards as stated in Chapter 7-507 of the Subdivision and Land Development Code shall remain in full effect; however, the following additional provisions will be applicable to any land to be subdivided which is located in the floodplain zoning districts of the City:
Where not regulated by this chapter or any other ordinance or codes, land to be subdivided in the floodplain zoning districts may be platted for development with the provision that the developer construct buildings and structures to minimize flood damage in accordance with this chapter and any other laws and ordinances regulating such development.
It must be assured that the flood-carrying capacity within an altered or relocated portion of any watercourse is maintained.
Building sites for all structures may be permitted where not prohibited by this chapter or any other chapter or code, if the site or structure is elevated so that the lowest floor construction, including basement, will be at a height two feet or more above the regulatory flood protection elevation. The measurement shall be to the bottom of the lowest beam. If fill is used to raise the elevation of a site or portion thereof, the fill area shall extend a distance of not less than 15 feet beyond the limits of the proposed structures. Said fill shall be properly designed and compacted, in six-inch lifts, and shall have not less than 95% of the maximum dry density obtainable using the Standard Proctor Test method.
[Ord. No. 20-1995]
Building sites for nonresidential structures or buildings shall be protected as provided for in Subsection C hereof. However, the Planning Commission may allow the subdivision of areas or development of sites for nonresidential uses at an elevation less than the regulatory flood protection elevation if the developer otherwise protects the area to that height or assures that the buildings or structures will be floodproof at least up to that height, in an approved manner as prescribed by Chapter 7-329 of the Zoning Code.
When a developer does not intend to develop the site itself and the Planning Commission determines that additional controls are required to ensure safe development, the Commission may require the developer to impose appropriate deed restrictions on the land. Such deed restrictions shall be inserted in every deed and noted on every recorded plan.
Where any excavation and grading are proposed or where any existing trees, shrubs or vegetative cover will be removed, the developer shall consult the Dauphin County Conservation District concerning the preparation of plans for erosion and sedimentation control and to secure information in order to:
Obtain a report indicating the extent and content of erosion and sedimentation control plans needed and determine whether or not a permit for earthmoving activity may be required from the Department of Environmental Protection under the rules and regulations of the Erosion and Sedimentation Control Act of 1973; and
Editor's Note: See 25 Pa. Code Ch. 102, Erosion and Sediment Control.
Obtain a report on the soil characteristics of the site so that the Planning Commission may determine the type and degree of development the site may accommodate because of the limitations of soils as related to basement and foundation construction, street and open space area construction and grading conditions.
Storm drainage facilities shall be designed to convey the flow of surface waters without damage to persons or property. The system shall ensure drainage at all points along streets and provide positive drainage away from buildings and on-site waste disposal sites. The plans shall be subject to the approval of the City Engineer.
The finished elevation of proposed streets shall be no more than two feet below the regulatory flood protection elevation.
All sanitary sewer systems located in a subdivision within the floodplain zoning districts, whether public or private, shall be floodproof up to the point of the regulatory flood protection elevation. The plans shall be subject to the approval of the City Engineer.
All water systems located in a subdivision within the floodplain zoning districts, whether public or private, shall be floodproof up to the point of the regulatory flood protection elevation.
No subdivision or land development shall be approved in the floodway district of the City if the proposed development and/or improvement will result in any increase in flood levels during the occurrence of a one-hundred-year flood.
Public utilities and facilities, such as gas and electrical systems, shall be located and constructed to minimize or eliminate flood damage.