Water terms starting with T

133 terms

101. Transmission To cause spread of germs.
102. Transmission line A set of electrical current conductors, insulators, supporting structures, and associated equipment used to move large quantities of power at high…
103. Transmissivity The rate at which water of the prevailing kinematic viscosity is transmitted through a unit width of the aquifer under a unit hydraulic gradient.
104. Transpiration The process by which water in plants is transferred into water vapor in the atmosphere. Evaporation of water through the leaves of plants.
105. Transport capacity The capacity of a river to carry sediment in suspension or to move sediment along the riverbed. Usually expressed as mass per unit of time.
106. Transverse Pertaining to or extending along the short axis, or width, of a structure. Perpendicular to or across the long axis, or length, of a structure.
107. Trapezoidal weir. See Cipolletti weir.
108. Trash Rack A screen located at an intake to prevent the ingress of debris.
109. Trash rake A device that is used to remove debris which has collected on a trashrack to prevent blocking the associated intake.
110. Trashrack A metal or reinforced concrete structure placed at the intake of a conduit, pipe, or tunnel that prevents entrance of debris over a certain size.
111. Trashrake A device that is used to remove debris which has collected on a trashrack to prevent blocking the associated intake.
112. Travel Time Time measured from the start of a dam breach to flooding at a particular location.
113. Tremie A device used to place concrete or grout under water.
114. Trench(es). See ditch.
115. Trestle A bridge, usually of timber or steel, that has a number of closely spaced supports between the abutments.
116. Triaxial shear test A test in which a specimen of soil or rock encased by an impervious membrane is subjected to a confining pressure and then loaded axially to failure.
117. Tribe Term used to designate a federally recognized group of American Indians and their governing body. Tribes may be composed of more than one band.
118. Tributary A creek, stream, or river that feeds a larger stream or river, or lake.
119. Tripod A three-legged support for a surveying instrument.
120. Trophic level Place of an animal in the food chain.
121. Trunnion A heavy horizontal hinge.
122. Tube valve A valve which is opened or closed by mechanically moving a tube upstream or downstream by an actuating screw.
123. Tuff Volcanic rock made up of rock and mineral fragments in volcanic ash matrix. Tuffs commonly are composed of much shattered volcanic rock glass—chilled…
124. Tunnel Covered portion of spillway between the gate or crest structure and the terminal structure, where open channel flow and/or pressure flow conditions may…
125. Turbid Having a cloudy or muddy appearance.
126. Turbidimeter A device that measures the amount of suspended solids in a liquid.
127. Turbidity The relative clarity of water, which may be affected by material in suspension in the water.
128. Turbine A device for converting the flow of a fluid (air, steam, water, or hot gases) into mechanical motion.
129. Turbulent flow That type of flow in which any water particle may move in any direction with respect to any other particle, and in which the head loss is approximately…
130. Turn angles To measure the angle between directions with a surveying instrument.
131. Turning Point A temporary point whose elevation is determined by additions and subtractions of backsights and foresights respectively.
132. Turning point (transfer point) A point whose elevation is taken from two or more instrument positions to determine their height in relation to each other.
133. Turnout A structure used to divert water from a supply channel to a smaller channel.