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<br />, <br /> <br />4.A. (15a) The "Normal High Water Line" is the elevation of the <br />flowline crest of the principal spillway or, if no principal spillway <br />exists, the flowline crest of the emergency spillway, <br /> <br />4.A.(16) "Impound Water" means to store or accumulate water for <br />immediate or future use in a reservoir. <br /> <br />4,A.(I7) "Inflow Design Flood" means the flood hydrograph which <br />is used to determine a spillway's hydraulic capacity as required by <br />these regulations. (See Safety Evaluation Flood, Rule 4.A.(27)). <br /> <br />4.A. (18) "Livestock Water Tank Dam" means a dam constructed for <br />the purpose of watering livestock, having a capacity hot exceeding 10 <br />acre-feet and a vertical height not exceeding 15 feet from the bottom <br />of the channel at the upstream toe of the dam to the bottom of the <br />emergency spillway. The dam may not be used for irrigation purposes <br />and the water course upon which the dam is located must be normally <br />dry. <br /> <br />4.A.(19) <br />ground surface <br />or river. <br /> <br />"Natural Surface of the Ground" means the undisturbed <br />before excavation, or the undisturbed bed of the stream <br /> <br />4.A.(20) "One-hundred-year Flood" means a potential flood which <br />has a magnitude (peak discharge) which is expected to be equaled or <br />exceeded on the average once during any one-hundred-year period <br />(recurrence interval) and has a one percent chance of being equaled or <br />exceeded during any year (0.01 exceedance probability). The terms <br />"one-hundred-year flood," "one percent chance flood," and "inter- <br />mediate regional flood" are synonymous. <br /> <br />4.A. (21) "Outlet" means a conduit (usually controlled by gates <br />or valves) which is used to release impounded water from the reservoir. <br /> <br />4.A.(22) "Owner" means any person or entity who owns, controls, <br />operates a dam, or proposes to construct a dam. For liability pur- <br />poses, the persons actually in control of a dam shall be deemed the <br />owner, unless notice of the true owner and their address has been <br />filed with the State Engiener by January 1, 1985, Changes in <br />ownership shall be filed with the State En9ineer immediately. <br /> <br />4.A,(23) "Probable Maximum Precipitation" (PMP) means the <br />theoretically greatest depth of precipitation for a given duration <br />that is physically possible over a drainage basin at any specific time <br />of year. <br /> <br />4.A.(24) "Reservoir" means a body of water impounded by a dam. <br /> <br />- 6 - <br />