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<br />. <br /> <br />~ t- .... ...." <br />'ill-J' <br />agee-type crest - A weir crest having an "s" shaped slope. <br /> <br />Operational losses - Those losses due to evaporation and seepage. <br /> <br />Overchute - Structure that is constructed over a canal or road to carry <br />water over the canal or road so that it does not flow into the canal <br />or onto the road surface. <br /> <br />Outlet channel - A waterway or drainage channel provided to collect and <br />carry away discharge. <br /> <br />Parshall flume - A device to measure the rate of streamflow. <br /> <br />Pediment - The gently sloping, rock-cored area at the base of a mountain. <br /> <br />Pedologic - Pertaining to the study of soils. <br /> <br />Peneplain - An area in which erosion has reduced the landscape to almost <br />a plain. <br /> <br />Penstock - A tube or conduit used to carry water to a turbine for gener- <br />ating power. <br /> <br />. <br /> <br />Periphyton - The community of organisms which live attached to rooted <br />aquatic plants. <br /> <br />Permeable material - That which allows water to pass through easily. <br /> <br />~ - The acid or alkaline condition of the soil or water. A value of <br />pH7 is.neutral. Lower values are acid, and higher values are basic <br />or alkaline. <br /> <br />Phreatophyte - A long rooted plant that absorbs its water from the <br />ground water. <br /> <br />Placer mining claim - A mining claim or individual right on a given <br />tract of surficial mineral deposit, usually a heavy metal such as <br />gold, in which a discovery has been made. This deposit was formed <br />by mechanical concentration of mineral particles from weathered <br />debris. <br /> <br />Plankton - The floating or weakly swimming flora or fauna occurring at <br />any depth in lakes, ponds, streams, or seas; often of microscopic <br />size. <br /> <br />~ ~ Symbol for parts per million - same as ppm and mg/l. <br /> <br />-- <br /> <br />. <br />