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<br />,- <br /> <br />Flood Insurance Implication <br /> <br />e If a below-BFE attached garage does not have proper openings, the Elevation Certificate pre- <br />pared for the building must identify the elevation of the garage floor slab as the lowest floor <br />(reference level) of the building. This may result in flood insurance premiums significantly <br />higher than those that would have applied if the garage had proper openings. <br /> <br />Guidance for Engineered Openings <br /> <br />In situations where it is not feasible or desirable to meet the openings criteria stated previously, a <br />design professional (registered engineer or architect) may design and certify openings. This <br />section provides guidance for such engineered designs. For openings not meeting all four re- <br />quirements for non-engineered openings listed on pages 2 and 3, certification by a registered <br />professional engineer or architect is required. Such certification must be submitted to, and kept <br />on file by, the community. These certifications must assure community officials that the open- <br />ings are designed in accordance with accepted standards of practice. A certification may be <br />affixed to the design drawings or submitted separately. It must include appropriate certification <br />language, and the name, title, address, signature, type of license, license number, and profes- <br />sional seal of the certifier. Figure 4 is an example of an acceptable certification. <br /> <br />e <br /> <br />Project Name <br /> <br />i, do hereby certify that the opening(sl designed for installafion in the <br />aforemenfioned building will allow for the automafic equalizing of hydrostatic flood Forces on exterior <br />walls by allowing for the automatic entry and exit of floodwater during floods up to and including the <br />base (1 OO-yearl flood. <br /> <br />Signature <br /> <br />Date <br /> <br />-- <br />/ " <br />( \ <br />\ ) <br />" / <br />-- <br /> <br />Tirle <br /> <br />Licence Number <br /> <br />Type of licence <br /> <br />Address <br /> <br />PROFESSiONAL SEAL <br /> <br />Figure 4. Example of Openings Certificate <br /> <br />Calculation of Flood Forces <br /> <br />e <br /> <br />Floodwaters can impose both hydrostatic and hydrodynamic forces on floodprone buildings. <br />Hydrostatic pressure is the force that water at rest exerts on any submerged object, including a <br />floodprone building. Hydrostatic pressure is capable of collapsing, moving, and severely damag- <br />ing most types of buildings. In many floods, hydrostatic pressure is the most prevalent cause of <br />damage. Hydrodynamic pressure is the force exerted on a vertical obstruction (foundation wall) <br />by flowing water and debris. <br /> <br />5 <br /> <br />~.. <br />