Laserfiche WebLink
<br />2 <br /> <br />. <br /> <br />In classifying floodproofed structures, the classification is based on the level 0 protection <br />(Le. flood proofing) against the Base Flood, The Base Flood Elevation (BFE) is sy onymous <br />with Regulatory Flood (R F) and the 100-year flood event. The term Regulatory lood Datum <br />(RFD) refers to the Base Flood Elevation plus one foot freeboard as required fo floodproof- <br />ing by the Colorado Water Conservation Board (CWCB). Floodproofed structur s are <br />categorized into three classes; completely dry Class A, essentially dry Class B, nd wet Class <br />C. Tabre 1,1 gives a summary of the classification of flood proofed structures. <br /> <br />. <br /> <br />Table 1.1 - Classification of Floodproofed Structures <br /> <br />. <br /> <br />Classification <br /> <br />Definition <br /> <br />Class A <br /> <br />ClassB <br /> <br />Completely Dry Structures designed to withstand all hydrostatic and hydro namic loads or <br />elevated above the BFE, Walls and joints shall be impermeable to passage of wate and water vapor <br />or first floors cited above the BFE, <br />Essentially Dry Structures designed to withstands all hydrostatic and hydrodyna icloads.A max- <br />imum of four (4) inches of water depth may accumulate in a space during a 2 hour period. <br />Wet Structures are allowed to fill with either clean or flood water to counter-balanc outside hydros- <br />tatic forces, <br /> <br />. <br /> <br />Class C <br /> <br />. <br /> <br />Specific flood proofing measures are classified as permanent, contingent, or em <br />manent measures are typically incorporated into the design of new structures a <br />require any advance flood warning or availability of persons to initiate action. P <br />flood proofing, such as elevation on fill, is always in place and reduces the elem nt of human <br />error. Contingent or partial flood proofing measures, such as prefitted window a d door <br />closures, require some type of human action to make the floodproofing measur s opera- <br />tional at the time a flood warning is announced. Contingent measures require s meone to be <br />at the site during the flood warning and that an adequate flood- warning plan f r the com- <br />munity exists. Emergency floodproofing measures, such as sandbagging, are ma eoperational <br />during an actual flood event. Emergency measures are temporary and should b carried out <br />according to a pre-arranged plan. Table 1.2 gives a summary of the c1assificatio of specific <br />flood proofing measures. <br /> <br /> <br />. <br /> <br />Classification <br /> <br />Definition <br /> <br /> <br />. <br /> <br />Table 1.2. Classification offloodproofed stru<:tures <br /> <br />Permanent <br /> <br />Do not require any action to <br />inititate. Usually incorporated <br />into the design, <br /> <br />Re~uire human action to initiate <br />at time of flood warning" <br /> <br />Measures used and initiated at <br />the time of flooding. <br /> <br />- water closure <br />. flood walls <br />- levees <br />- elevation <br />- removable fI d shields <br />. watertight do rs <br />- movablefloo walls <br />-sand bagging <br />- temporary Ie <br /> <br />. <br /> <br />Contingent <br /> <br />Emergency <br /> <br />-. <br /> <br />.. <br /> <br />. <br />