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Portsmouth, Virginia, Cade of Ordinances: PART 11 -CODE -Chapter 14.1 FLOOD PROTECTION h. Outdoor storage of equipment, materials or supplies which are buoyant, flammable or explosive. (2} Nonconforming uses of this chapter notwithstanding, no expansion of any of the above uses located within the floodplain district shall be permitted. (f) Standards forsubdivisian proposals. (1) A[I subdivision proposals shall be consistent with the need to minimize flood damage; (2) Ali 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 50 lots or five acres, whichever is the lesser.. Sec.14.9-12. -Design criteria for public improvements. (a} Sanitary sewer facilities. All new or replacement sanitary sewer facilities and private package sewage treatment plants, including all pumping stations and collector systems, shall be designed to minimize or eliminate infiltration of floodwaters into the systems and of discharges from the systems into the floodwaters. The facilities and plants shall be located and constructed to minimize or eliminate flood damage and impairment. (b) Water facilities. All new or replacement water facilities shall be designed to minimize or eliminate infiltration of floodwaters into the system and shalt be located and constructed to minimize or eliminate flood damage. (c} Drainage facilities. All storm drainage facilities shall be designed to convey the flow of surface waters without causing injury to persons or damage to property. The facilities shall ensure drainage away from buildings and on-site waste disposal sites. The city engineer may require a primary underground system to accommodate frequent floods and a secondary surface system to accommodate larger, less frequent floods. Drainage plans shall be consistent with local and regional drainage plans. The facilities shall be designed to prevent the discharge of excess runoff onto adjacent properties, (d) Utilities. All utilities, such as gas lines, electrical and telephone systems, being placed in floodprone areas should be located, elevated (where possible) and constructed to minimize the chance of impairment during a flooding occurrence. (e) Streets and sidewalks. Streets and sidewalks should be designed to minimize their potential for increasing and aggravating the levels of flood flow. Drainage openings shall be designed to reduce exposure to flood hazards. 19