afflux
nounEtymology From Latin affluĕre, affluxum. See affluent.
1
An upward rush of fluid.
- The vis viva of these affluxes is employed almost wholly in turning the mass of intermediate gas […]1874 January 9, "Chemical News from Foreign Sources," Chemical News http://books.google.com/books?id=jOUEAAAAQAAJ&pg=PA20-IA6&dq=affluxes&ei=oWrlRqH2I6HApgKCooX7AQ, page 26, of waterspouts
2
Geography, Hydrology, Natural sciences The rise in water level (above normal) on the upstream side of a bridge or obstruction caused when the effective flow area at the obstruction is less than the natural width of the stream immediately upstream of the obstruction.
- Backwater due to the crossing as a whole should not be confused with local afflux at piers due to pileup of flow against the hydraulic stagnation point […]2004, Transportation Association of Canada, Guide to Bridge Hydraulics, →ISBN, page 66: