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(b) Nonfidal wetlands not connected by surface flow to tidal wetlands, water bodies with perennial flow or other tidal waters. Where the floodplain or nonfidai wetlands exist outside of the RPA then the extem of these features delineate the RMA. If these features do not exist, the RMA is 530 feet from the landward edge of the RPA. (3) The intensely developed area (IDA) is an overlay of the resource protection area (RPA) and the resource management area (RMA). This area serves as a redevelopment area and shall have one of the following characteristics: a. Development has severely altered the namrai state of the area such that it has more than 50% impervious surface; b. Public sewer and water systems, or a constructed stormwater drainage system, or both, have been constructed and served the area as of the original Chesapeake Bay Preservation Area Overlay Ordinance adoption date of September 1, 1990. (This condition does not include areas planned for public sewer and water or constructed stormwater drainage systems); or c. Housing density is equal to or greater than four dwelling units per acre. (c) The Chesapeake Bay Preservation Area (CBPA) map showing the general location of CBPAs should be consulted and, per Section 9.1-9 of this ordinance, a site- specific determination of the Resource Protection (RPA) shall be performed by persons contemplating regulated activities within the City of Portsmouth. (d) Portions of RPAs and RMAs designated by the City Council as Intensely Developed Areas shall serve as redevelopment areas. Areas so designated shall comply with all erosion and sediment control requirements and the performance standards for redevelopment in Section 9.1-11. (e) If at least 25% of a lot, parcel, or development project lies within the boundaries of a CBPA, the entire lot, parcel, or development project shall comply with the requirements of this Chapter. Section 9.1-5. Use Regulations. Permitted uses, special permit uses, accessory uses, and special requirements shall be as established by the underlying zoning district, unless specifically modified by the requirements set forth herein.