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criteria or specifications set forth within any local regulations and guidelines • enacted pursuant to the authority of § 10-6 of this chapter. (b) Pre -development and post -development runoff rates determined for purposes of paragraph (a), above, shall be verified by detailed engineering calculations provided by the applicant. Such calculations shall be consistent with accepted engineering practices, as determined by the program authority. (c) Notwithstanding any other provisions of this section, the following activities are exempt from the requirements of this section: (1) land development, or a portion of land development on land which is designated as lying within a floodplain, except in cases where the Floodplain has been modified by permitted fill or other activities in compliance with the City's zoning ordinance; (2) land development or a portion of land development, on land that is adjacent to a floodplain, and the owner has demonstrated to the reasonable satisfaction of the program authority that off-site improvements or other provisions for the disposition of surface water runoff would equally or better serve the public interest and safety, and that such method of disposition would not adversely affect downstream properties or stream channels; (3) any land development related to a final site plan approved by the city prior to the effective date of this ordinance. (e) The program authority may exempt a land development or part thereof from some or all of the requirements of this section, if all of the following conditions are satisfied: • (1) the program authority determines that the application of the requirements of this article would cause damage to the environment to an extent which exceeds the benefits of the strict application of all of the requirements of this article; (2) the granting of an exemption of any requirement of this section will not create a threat to the public health, safety or welfare, or to the environment; and (3) all requirements that are determined by the program authority to not apply to the land development or part thereof shall be specifically identified and set forth in writing within the approved stormwater management plan. • Sec. 10-53. Review; approval. Each stormwater management plan submitted pursuant to this article shall be reviewed and approved as provided herein: (a) The plan shall be reviewed by the program authority to determine its compliance with the requirements of this article and with applicable federal and state laws and regulations. Where a proposed stormwater management plan includes facilities or BMPs for which design requirements and specifications, and/or maintenance requirements, are specified within the Virginia Stormwater Management (SWM) Handbook and/or the Virginia Stormwater Management Regulations set forth within 4 VAC 3-20 et seq., the program authority shall utilize those design requirements, specifications and/or maintenance requirements in reviewing and making decisions as to the acceptability of such facilities or BMPs under this article. -20-