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<br />j. Radial gate (Tainter gate). A gate with a curved upstream plate and <br />radial arms hinged to piers or other supporting structure. <br /> <br />k. Regulating gate (regulating valve). A gate or valve that operates <br />under full pressure flow conditions to regulate the rate of discharge. <br /> <br />1. Roller drum gate. See drum gate. <br /> <br />m. Roller gate (stoney gate). A gate for large openings that bears on a <br />train of rollers in each gate guide. <br /> <br />n. <br /> <br />Skimmer <br />control <br />water. <br /> <br />gate. A gate at the spillway crest whose prime purpose <br />the release of debris and logs with a limited amount of <br />It is usually a bottom hinged flap or Bascule gate. <br /> <br />is to <br /> <br />o. Slide gate (sluice gate). A gate that can be opened or closed by <br />sliding in supporting guides. <br /> <br />Gate chamber (valve chamber). A room from which a gate .or valve can be <br />operated, or sometimes in which the gate is located. <br /> <br />Geotextiles. Any fabric or textile (natural or synthetic) when used as an <br />engineering material in conjunction with soil, foundations or rock. Geotex- <br />tiles have the following uses: drainage, filtration, separation of materials, <br />reinforcement, moisture barriers, 'and erosion protection. <br /> <br />Groin. The area along the contact (or intersection) of the face of a dam with <br />the abutments. <br /> <br />Grout. A fluidized material that is injected into soil, rock, concrete, or <br />other construction material to seal openings and to lower the permeability <br />and/or provide additional structural strength. There are four major types of <br />grouting materials: chemical; cement; clay; and bitumen. <br /> <br />Grout curtain. One or more zones, usually thin, in the foundation into which <br />grout is injected to reduce seepage under or around a dam. <br /> <br />Grout blanket. An area of the foundation systematically grouted to a uniform <br />shallow depth. <br /> <br />Grout cap. A concrete pad constructed to facilitate subsequent pressure <br />grouting of the grout curtain. <br /> <br />Hazard classification. The rating for a dam based on the <br />quences of failure. The rating is based on potential for <br />damage to property that failure of that dam could cause. <br />is related to the amount of development downstream of a <br /> <br />potential conse- <br />loss of life and <br />Such classification <br />dam. <br /> <br />Head, Static. The vertical distance between two points in a fluid. <br /> <br />Head, Velocity. The vertical distance that would statically result from the <br />velocity of a moving fluid. <br /> <br />-8- <br />