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<br />0024u9 <br /> <br />Grout: A fluid mixture of cement and water or sand, cement, and water used to seal <br />joints and cracks in rock foundation. <br /> <br />H <br /> <br />Hazard classification: The rating for a dam based on the potential consequences of <br />failure. The rating is based on potential loss of life and damage to property that failure of <br />the dam cause. Such classification is related to the amount of development downstream <br />of a dam. <br /> <br />Head: The difference in number of feet between two water surface elevations. <br /> <br />Headrace: See "forebay." <br /> <br />Head loss: The energy per unit weight of water lost due to transitions, bends, etc. <br /> <br />Heave: The upward movement of land surfaces or structures due to subsurface expansion <br />of soil or rock, or vertical faulting of rock. -: <br /> <br />Hydraulic height: Height to which water rises behind the dam and is the difference <br />between the lowest point in the original streambed at the axis or the centerline crest of the <br />dam and the maximum controllable water surface. <br /> <br />Hydrograph: A graph showing for a given point on a stream or conduit, the discharge, <br />stage, velocity, available power, or other property of water with respect to time. <br /> <br />. --....J <br /> <br />Hydrology: The science that treats the occurrence, circulation properties, and distribution <br />of the waters of the earth and their reaction to the environment. <br /> <br />I <br /> <br />Inflow, reservoir: The amount of water entering a reservoir expressed in acre-feet per <br />day or cubic feet per second. <br /> <br />Inflow Design Flood (IDF): See "flood, inflow design." <br /> <br />Instrumentation: Any device used to monitor the performance of the structure during its <br />construction and throughout its useful life. <br /> <br />Inundation map: A map of the ground surfaces downstream of a dam showing the <br />probable encroachment by water released because of failure of the dam or from abnormal <br />flood flows released through a dam's spillway. <br /> <br />Invert: The lowest point of the interior of a circular conduit, pipe, or tunnel. <br />