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<br />Flopd, Inflow Design (IDF). The flood used in the design of a dam and its <br />appurtenant works particularly for sizing the spillway and outlet works, and <br />for 'determining maximum temporary storage and height of dam requirements. <br /> <br />Flood, Probable Maximum (PMF). The most severe flood that is considered <br />reasonably possible at a site as a result of meteorologic and hydrologic <br />conditions. <br /> <br />Floodplain. An area adjoining a body of water or natural stream that has been <br />or may be covered by floodwater. <br /> <br />Freeboard. Vertical distance between the design water level and the top of <br />dam. <br /> <br />Gallery. A passageway in the body of a dam used for inspection, foundation <br />grouting, and/or drainage. <br /> <br />Gantry crane. A fixed or travelling bent-supported crane for handling heavy <br />equipment. <br /> <br />Gate. A movable, watertight barrier for the control of water in a waterway. <br /> <br />a. Bascule gate. See flap gate. <br /> <br />b. Bulkhead gate. A gate used either for temporary closure of a channel <br />or conduit before dewatering it for inspection or maintenance or for <br />closure against flowing water when the head difference is small, <br />e.g., for diversion tunnel closure. <br /> <br />c. Crest gate (spillway gate). A gate on the crest of a spillway to <br />control the discharge or reservoir water level. <br /> <br />d. Drum gate. A type of spillway gate consisting of a long hollow <br />drum. The drum may be held in its raised position by the water <br />pressure in a flotation chamber beneath the drum. <br /> <br />e. Emergency gate. A standby or auxiliary gate used when the normal <br />means of water control is not available. Sometimes referred to as <br />guard gate. <br /> <br />f. Fixed wheel gate (fixed roller gate) (fixed axle gate). A gate <br />having wheels or rollers mounted on the end posts of the gate. The <br />wheels bear against rails fixed in side grooves or gate guides. <br /> <br />g. Flap gate. A gate hinged along one edge, usually either the top or <br />bottom edge. Examples of bottom-hinged flap gates are tilting gates <br />and fish belly gates so called from their shape in cross section. <br /> <br />h. Flood gate. A gate to control flood release from a reservoir. <br /> <br />1. Outlet gate. A gate controlli,ng the flow of water through a <br />reservoir outlet. <br /> <br />-7- <br />