Liquid flow

Volume of water passing through a cross section of a watercourse per time unit. The flow rates of watercourses are expressed in m3/s with at least three significant figures (e.g. 1.92 m3/s, 19.2 m3/s, 192 m3/s) or for small streams in l/s. The national HYDRO database stores measurements of water levels coming from 3,500 measuring stations (including 2,400 that are currently in service) and used to calculate instantaneous, daily and monthly flow rates in a large number of French streams. Liquid flow and sediment discharge are the two main variables of river dynamics.