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noo~RdatedBuD~gCod~ Building codes can be part of a community's legal mecha- nisms for reducing flood damage. The Building Officials and Code Administrators (BOCA) model code, which is used as a guide in many parts ofthe country, includes several sections meant to mitigate flood damage. Many communities may have similar requirementsl and the de- signer should consult with local or state building officials to ascertain the flood-related codes that are in effect. Below are relevant excerpts from the BOCA model code, followed by a list of the state agencies that coordinate or enforce building codes within their respective jurisdic- tions. Excerpts for the Building Code Officials and Code Administrators (BOCA) Model Code Section 70.9.0. Special Loads 709.1 General: Provisions shall be made for all special loads herein prescribed and all other special loads to which the building or structure may be subjected. 709.2 Below Grade: All retaining walls and other walls below grade shall be designed to resist lateral soil pressures with due allowance for hydrostatic pressure and for all superimposed vertical loads. 709.3 Hydrostatic Uplift: All foundation slabs and other footings subjected to water pressure shall be designed to resist a uniformly distributed uplift equal to the full hydro- static pressure. Section 870. 0. Retaining walls 870.1 General: Walls built to retain or support the lateral pressure of earth or water or other superimposed loads shall be designed and constructed of approved masonry, reinforced concrete, steel sheet piling, or other approved materials within the allowable stresses of accepted en- gineering practice. 870.2 Design: Retaining walls shall be designed to resist the pressure of the retained material, including both dead and live load surcharges to which they may be subjected, and to insure stability against overturning, slidingl exces- sive foundation pressure, and water uplift. 870.3 Hydrostatic Pressure: Unless drainage is provided, the hydrostatic head of water pressure shall be assumed equal to the height ofthe wall. Section 872.0. Waterproofing and Floodproofing 872. I General: The exterior structural elements of all buildings herein specified shall be waterproofed in ac- cordance with the approved rules. 872.2 Steel Frame: Exterior steel columns and girders, before embedment in masonry of the required fire- resistance rating specified. . ., shall be protected from moisture by approved waterproofing material, a parging coat of cement mortar or by a minimum of eight (8) inches of weather-tight masonry 872.3 Chases: The backs and sides of all chases in ex- terior walls with less than eight (8) inches of approved masonry to the exterior surface shall be insulated and waterproofed. 872.4 Foundations: Exterior walls below grade and the cellar floors of all buildings for institutional and residen- tial uses (use groups I and R) enclosing habitable or occupiable rooms or spaces below grade shall be made watertight, and when necessary shall be reinforced to withstand water pressure as prescribed in Sections 709.0 and 870.0. The basement walls of buildings in the residen- tial use groups and the walls of all habitable and occupi- able rooms and spaces below grade shall be protected with not less than a one (1) coat application of approved waterproofing paint, or a one-half (%) inch parging coat of portland cement mortar or other approved dampproof covering. 872.4.1 Subsoil Drains: Subsoil drains shall be provided around foundations enclosing habitable or usable spaces located below grade and which are subjected to ground water conditions. Drains shall be installed at or below the area to be protected and shall discharge by gravity or by mechanical means into an approved drainage system complying with the plumbing code listed in Appendix B (ofthecodes). 872.5 Types of Waterproofing: The processes and methods used to render buildings, structures or parts thereof watertight as herein required shall comply with accepted engineering practice covering types of waterproofing. 872.6 Floodproofing: Where a structure is located within a floodplain as determined by the building official or the governmental body having jurisdiction, such a structure must be designed to resist or overcome the anticipated flood conditions. 93