Gives a method of measurement of flow in rivers and artificial channels under steady or slowly varying flow conditions using certain types of standing-wave (or critical depth flumes).
BS 3680-4C:1981 history
2013BS ISO 4359:2013 Flow measurement structures. Rectangular, trapezoidal and U-shaped flumes
0000 BS ISO 4359:1983
1981BS 3680-4C:1981 Methods of measurement of liquid flow in open channels - Weirs and flumes - Flumes