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Portsmouth, Virginia, Code of Ordinances: PART II -CODE -Chapter 14.1 FLOOD PROTECTION (6} New and replacement sanitary sewage systems shat( be designed to minimize or eliminate infiltration of flood waters into the systems and discharges from the systems into flood waters. (7} On-site waste disposal systems shall be designed to current City of Portsmouth standards and shah be located and constructed to avoid impairment to them or contamination from them during flooding. (bj Floodplain requirements. (1j The following provisions shall apply within the Floodway District of an AE zone: a. Within any floodway area, no encroachments, including fill, new construction, substantial improvements, or other development shaft be permitted unless it has been demonstrated through hydrologic and hydraulic analysis performed in accordance with standard engineering practice that the proposed encroachment will not result in any increase in flood levels within the community during the occurrence of the base flood discharge. Hydrologic and hydraulic analysis shall be undertaken only by professional engineers or others of demonstrated quaycations, who shall certify that the technical methods used correctly reflect currently-accepted technical concepts. Studies, analyses, computations, etc., shall be submitted in sufficient detail to allow a thorough review by the Floodplain Administrator. b. Development activities which increase the water surface elevation of the base flood may be allowed, provided that the applicant first applies -with the City of Portsmouth's endorsement- for aConditional Letter of Map Revision (CLOMR), and receives the approval of the Federal Emergency Management Agency c. If Section 14.1-11 b (1j (a} is satisfied, all new construction and substantial Improvements shall comply with all applicable flood hazard reduction provisions in Sections 14.1-10 and 14.1-11 of this code. d. The placement of manufactured homes (mobile homes) is prohibited except in an existing manufactured home (mobile home) park or subdivision. A replacement manufactured home is prohibited. (2} The following provisions shall apply within an AE or AH zone (44 CFR 80.3(cjj. a. Until a regulatory floodway is designated, no new construcflon, substantial improvements, or other development (including fill) shall be permitted within the areas of special flood hazard; designated as Zones Al-3t) and AE or AH on the FIRM, unless it is demonstrated that the cumula#ive effect of the proposed development, when combined with all other existing and anticipated development, will not increase the water surface elevation of the base flood more than one foot at any point wikhin the City of Portsmouth. b. Development activities in Zones AI-30 and AE or AH, on the City of Portsmouth's FIRM which increase the water surface elevation of the base flood by more than one foot may be allowed, provided that the applicant first applies -with the City of Portsmouth's endorsement -far a 13