That stretch of a river on which the stage and/or flow at a particular gage is characteristic of stage and/or flow along that entire reach. Consequently, streamflow, depth, drainage area and slope are fairly uniform along this stretch and there are no major inflows, diversions, dams, etc.
RIVER GAGE REACH
Meaning of RIVER GAGE REACH in English
Environmental engineering English vocabulary. Английский словарь экологического инжиниринга. 2012