Sec. 24-600 to 24-603

Other

• Storm drainage flow conveyance

  All storm drainage facilities shall be designed to convey the flow of surface waters without damage to persons or property. The systems shall ensure drainage away from buildings and on site waste disposal sites.

• Existing structure improvement threshold50 pct

  Any modification, alteration, repair, reconstruction or improvement of any kind to an existing structure and/or use located in any floodplain area to an extent or amount of less than 50 percent of its market value shall be elevated to conform to the Virginia Uniform Statewide Building Code; and, the substantial improvement of any kind to a structure and/or use, regardless of its locations in a floodplain area, to an extent or amount of 50 percent or more of its market value shall be undertaken only in full compliance with the provisions of these regulations and the Virginia Uniform Statewide Building Code and shall require that the entire structure be brought into full compliance with these provisions.

• FillGrading (cut & fill)Reshaping land by removing earth (cut) or adding it (fill), often capped by volume. data submission

  Where, in the opinion of the director of community development or his designee additional topographic, engineering and other data or studies are necessary to determine the effects of flooding on a proposed structure or fill and/or the effect of such structure or fill on the flow of water in flood stage, the applicant shall submit such data or studies.

• FillGrading (cut & fill)Reshaping land by removing earth (cut) or adding it (fill), often capped by volume. erosion protection

  Fill shall be effectively protected against erosion by vegetative cover, riprap, gabions, bulkhead or other acceptable method. Any structure, equipment or material permitted shall be firmly anchored to prevent dislocation due to flooding.

• FillGrading (cut & fill)Reshaping land by removing earth (cut) or adding it (fill), often capped by volume. material non-polluting

  Fill shall be of a material that will not pollute surface water or groundwater.

• FillGrading (cut & fill)Reshaping land by removing earth (cut) or adding it (fill), often capped by volume. no increase in flood levels

  Such fill will not result in any increase in flood levels during the occurrence of a one percent annual chance (100-year) flood discharge. The flood-carrying capacity of the watercourse shall be maintained.

• Septic tank drain field placement

  New or replacement septic tank drain fields shall be placed where they shall not be impaired or contaminated by a base flood. The Virginia Department of Health shall be consulted to verify compliance with this requirement.

• Sanitary sewer infiltration protection

  All new or replacement sanitary sewer facilities shall be designed to eliminate infiltration of floodwaters into the systems up to the one percent annual chance (100-year) flood level and discharges from the systems into the floodwaters in accordance with the Commonwealth of Virginia, Department of Health, Sewage Collection and Treatment Regulations.

• Street and sidewalk flood design

  Streets and sidewalks should be designed to minimize their potential for increasing and aggravating the levels of flood flow. Drainage openings shall be required to sufficiently discharge flood flows without unduly increasing flood heights.

• Utility flood protection

  All utilities, such as gas lines, electrical and telephone systems, being placed in flood prone areas should be located and constructed to eliminate the chance of impairment during a 100-year flooding occurrence.

• VarianceVariancePermission to depart from a specific dimensional rule, granted on a showing of hardship. accessoryAccessory useA secondary activity customarily incidental to the main use of the lot — a garage, a home office. structure size limit600 sqftsq ftSquare feet. An acre is 43,560 sq ft; a typical suburban lot is 7,000–10,000.

  No variance shall be granted for any accessory structure to be wet floodproofed if that structure exceeds 600 square feet.

• VarianceVariancePermission to depart from a specific dimensional rule, granted on a showing of hardship. prohibition for floodway increase

  No variance shall be granted for any proposed use, development or activity within any floodway district that will cause any increase in the one percent annual chance (100-year) flood elevation.

• Water facilities flood damage minimization

  All new or replacement water facilities shall be designed to eliminate infiltration of floodwaters into the systems and shall be located and constructed to minimize or eliminate flood damages.

• Watercourse modification notification

  The Federal Insurance Administrator, adjacent jurisdictions and the Department of Conservation and Recreation, Division of Dam Safety and Floodplain Management shall be notified and all federal and state permits shall be obtained prior to the alteration or relocation of any watercourse. The flood-carrying capacity to such watercourse shall be maintained.