Abstract

Oguz Cem Pamuk, Kemal Anar and Daron Altan Oktay

Determining water flow discharge in open channels is a very important task for agricultural water management, but current methods are labor-intensive and difficult. The entropy method suggested by Chiu and Said (1995) promises to simplfy the task of measuring water flow rates. This paper offers a further simplification of ongoing discharge measurements by showing that the umax and Hmax values form a constant in a specific water channel cross section. Once the umax/Hmax constant is determined, umax, and therefore discharge, can easily be calculated from Hmax measurements. This method, which we call Qumax method in this paper, was compared against the integrated discharge method for accuracy and was found to have an accuracy similar to that of two other common methods, the integrated Q 0.2 to 0.8 and the entropy methods (QMi). Comparisons were carried out at four sites along the tributaries of the Kizilirmak river in central Anatolia, Turkey.