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(g) Standards for the Floodway District. The following provisions shall apply within the Floodway District: (1) Encroachments, including fill, new construction, substantial improvements and other developments are prohibited unless certification (with supporting technical data) by a registered professional engineer is provided demonstrating that encroachments shall not result in any increase in flood levels during occurrence of the base flood. Development activities, which increase the water surface elevation of the base flood, may be allowed, provided that the {developer or applicant} first applies - with the City of Portsmouth, Virginia's endorsement - for a conditional Flood Insurance Rate Map and floodway revision, and receives the approval of the Federal Emergency Management Agency. (2) If Article 4, Section 4.6 (A) is satisfied, all new construction and substantial improvements shall comply with all applicable flood hazard reduction provisions of Article 4. (3) The placement of manufactured homes (mobile homes) is prohibited, except in an existing manufactured homes (mobile homes) park or subdivision. A replacement manufactured home may be placed on a lot in an existing manufactured home park or subdivision provided the anchoring, elevation, and encroachment standards are met. (h) Standards for Subdivision Proposals (1) All subdivision proposals shall be consistent with the need to minimize flood damage; (2) All subdivision proposals shall have public utilities and facilities such as sewer, gas, electrical and water systems located and constructed to minimize flood damage; (3) All subdivision proposals shall have adequate drainage provided to reduce exposure to flood hazards, and (4) Base flood elevation data shall be provided for subdivision proposals and other proposed development proposals (including manufactured home parks and subdivisions) that exceed fifty lots or five acres, whichever is the lesser.