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Section G303 Site Improvement

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G303.1 Development in Floodways
Development or land-disturbing activity shall not be authorized in the floodway unless it has been demonstrated through hydrologic and hydraulic analyses performed in accordance with standard engineering practice, and prepared by a registered design professional, that the proposed encroachment will not result in any increase in the base flood level, in accordance with Section G103.5.
G303.2 Coastal High-Hazard Areas and Coastal A-Zones
In coastal high-hazard areas and coastal A-Zones:
  1. New buildings, not including substantial improvements, shall only be authorized landward of the reach of mean high tide.
  2. The use of fill for structural support of buildings is prohibited.
G303.3 Sewer Facilities
All new or replaced sanitary sewer facilities, private sewage treatment plants (including all pumping stations and collector systems) and on-site waste disposal systems shall be designed in accordance with Chapter 7, ASCE 24, to minimize or eliminate infiltration of floodwaters into the facilities and discharge from the facilities into floodwaters, or impairment of the facilities and systems.
G303.4 Water Facilities
All new or replacement water facilities shall be designed in accordance with the provisions of Chapter 7, ASCE 24, to minimize or eliminate infiltration of floodwaters into the systems.
G303.5 Storm Drainage
Storm drainage shall be designed to convey the flow of surface waters to minimize or eliminate damage to persons or property and shall meet the requirements of ASCE 24.
G303.6 Streets and Sidewalks
Streets and sidewalks shall be designed to minimize potential for increasing or aggravating flood levels and shall meet the requirements of Section G303.8.
G303.7 Retaining Walls and Driveways
Retaining walls shall be designed in accordance with Section 1807. Retaining walls and driveways shall meet the requirements of Section G303.8.
G303.8 Grading and Fill
In flood hazard areas, grading and/or fill shall not be approved:
  1. Unless such fill is placed, compacted and sloped to minimize shifting, slumping and erosion during the rise and fall of flood water and, as applicable, wave action, in accordance with ASCE 24 and Section 1804 of this code.
  2. In floodways, unless it has been demonstrated through hydrologic and hydraulic analyses performed by an engineer in accordance with standard engineering practice that the proposed grading or fill, or both will not result in any increase in the flood levels during the occurrence of the design flood, in accordance with Section G103.5.
  3. In coastal A-Zones and coastal high-hazard areas, unless such fill is conducted and or placed to avoid diversion of water and waves towards any building or structure.

Related Code Sections

Section G303 Flood-Resistant Construction, Site Improvement
In coastal high-hazard areas and coastal A-Zones: New buildings, not including substantial improvements, shall ...
Section G303 Flood-Resistant Construction, Site Improvement
sanitary sewer facilities, private sewage treatment plants (including all pumping stations and collector systems) and on-site waste disposal systems ...
Section G303 Flood-Resistant Construction, Site Improvement
sanitary sewer facilities, private sewage treatment plants (including all pumping stations and collector systems) and on-site waste disposal systems ...
G303.2 Flood-Resistant Construction, Coastal High-Hazard Areas and Coastal A-Zones
In coastal high-hazard areas and coastal A-Zones: New buildings, not including substantial improvements, shall only be authorized landward ...
G303.3 Flood-Resistant Construction, Sewer Facilities
All new or replaced sanitary sewer facilities, private sewage treatment plants (including all pumping stations and collector systems) and on-site ...