pool, plunge — A pool, basin, or hole scoured out by falling water at the 

 base of a water fa I I . 



profile — In open channel hydraulics, it is the water or bed surface ele- 

 vation graphed aganist channel distance. 



reach — A comparatively short length of a stream, channel, or shore. 



regional analysis — A hydrologic analysis, the purpose of which is to esti- 

 mate hydrologic parameters of a river by use of measured values of the 

 same parameters at other rivers within a selected region. 



riffle — A shal low rapids in an open stream, where the water surface is 

 broken into waves by obstructions wholly or partly submerged. 



riparian — Pertaining to anything connected with or adjacent to the banks 

 of a stream or other body of water. 



riparian vegetation — Vegetation bordering floodplains and occurring within 

 f I oodp I a i ns. 



riprap - Large sediments or angular rock used as an artificial armor layer. 



river regime — A state of equilibrium attained by a river in response to 

 the average water and sediment loads it receives. 



run — A stretch of relatively deep fast flowing water, with the surface 

 essentially nont urbu I ent . 



scour — The removal of sediments by running water, usual ly associated with 

 removal from the channel bed or floodplain surface. 



scrape - A method of removing floodplain gravels from surface deposits using 

 tractors or scrapers. 



sediment discharge — The volumetric rate of sediment transfer past a spe- 

 cific river cross section. 



sinuous river — Sinuous channels are similar to meandering channels with 

 a less pronounced winding pattern. The channel may contain smaller 

 point bars and have less tendency for downvalley shifting. The channels 

 are more stable with respect to lateral shifting. 



sinuousity — A measure of the amount of winding of a river within its flood- 

 plain; expressed as a ratio of the river channel length to the corres- 

 ponding valley length. 



slope — The inclination or gradient from the horizontal of a line or sur- 

 face. The degree of inclination is usually expressed as a ratio, such 

 as 1:25, indicating one unit rise in 25 units of horizontal distance. 



401 



