Traditional simple formulae and methods for the everyday practice of flow measurement have been
believed to work well for many years. However practitioners have occasionally expressed doubt
about those formulae as well as the desire to have more accurate methods, should they be necessary.
This paper presents some applications of mathematical and computational methods to the practice
of flow measurement, resulting in more-accurate and possibly simpler hydrographic procedures.
Also, existing procedures for ultrasonic velocimetry are criticised and the more-accurate methods
are recommended for that too. Finally a correction method is presented for the effects of rising or
falling stage on rating curves.