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100-year flood adjusted analysis annual low flows annual runoff arithmetic mean average base-flow measurements Bogue Chitto Bowie Creek Chebanse class intervals column computed Conecuh River correlation cubic feet cumulative curve based curve of relation daily discharge defined double-mass curve drainage area drainage basin duration curve equaled or exceeded equation evapotranspiration example factors feet per second figure flow-duration curve flow-duration data frequency curve gaging station gaging-station records Geological Survey graph graphical Hattiesburg hydrologic index station inflow Iroquois River Kankakee River Leaf River line of relation log cycles LOW-FLOW CHARACTERISTICS mean annual flood mean discharge median method outflow peak percent percent-duration points period of record plotting position precipitation recurrence interval regional regression represent River at Momence short-term records short-term station shown slope square mile statistics storage straight line stream streamflow surface-water hydrology Survey Water-Supply Paper tally marks tion U.S. Geol ungaged values variable
Page 8 - Drainage basin is a part of the surface of the earth that is occupied by a drainage system, which consists of a surface stream or a body of impounded surface water together with all tributary surface streams and bodies of impounded surface water. Gage height (GH) is the water-surface elevation referred to some arbitrary gage datum. Gage height is often used interchangeably with the more general term "stage," although gage height is more appropriate when used with a reading on a gage.
Page 17 - That part of the precipitation that appears in streams. It is the same as streamflow unaffected by artificial diversions, storage, or other works of man in or on the stream channels.
Page 12 - Cycle — a convenient term to denote the circulation of water from the sea, through the atmosphere, to the land; and thence, with many delays, back to the sea by overland and subterranean routes, and in part by way of the atmosphere; also the many short circuits of the water that is returned to the atmosphere without reaching the sea.
Page 8 - ... by gravity into the river above the specified point. Figures of drainage area given herein include all closed basins, or noncontributing areas, within the area unless otherwise noted.
Page 7 - Discharge, in its simplest concept, means outflow; therefore, the use of this term is not restricted as to course or location, and it can be applied to describe the flow of water from a pipe or from a drainage basin.
Page 8 - Double-mass curve. A plot on arithmetic cross-section paper of the cumulated values of one variable against the cumulated values of another or against the computed values of the same variable for a concurrent period of time.
Page 9 - When pure water at its maximum density is taken as standard, the relative density is the specific gravity. relative evaporation — The ratio of the rate of evaporation from a land or water surface in contact with the atmosphere to the evaporativity under the existing atmospheric conditions; that is, the ratio of the actual to the potential rate of evaporation. Also called evaporation opportunity.
Page 5 - CHANNEL - (1) A natural or artificial waterway of perceptible extent which either periodically or continuously contains moving water, or which forms a connecting link between two bodies of water. (2) The part of a body of water deep enough to be used for navigation through an area otherwise too shallow for navigation. (3) A large strait, as the English Channel. (4) The deepest part of a stream, bay, or strait through which the main volume or current of water flows.