noun
: a device for maintaining a constant head or pressure on a measuring weir or orifice ; specifically : a short flume with long wells at each end and a spillway over which the excess water flows
noun
: a device for maintaining a constant head or pressure on a measuring weir or orifice ; specifically : a short flume with long wells at each end and a spillway over which the excess water flows
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012