%0 Journal Article
%T Technical note: Effects of free-surface on design charts for open channels
%A M Rahimpour
%J Water SA
%D 2012
%I Water Research Commission
%X Normal depth is an important parameter for the design of channels and canals. For rectangular, trapezoidal, and circular channel sections it is possible to express normal depth by a trial-and-error procedure or analytically. However, the effects of free-surface on the design charts for determination of the normal depth are not investigated. In this paper, graphical solutions of normal depth for the rectangular, trapezoidal, and circular cross-sections have been obtained in the non-dimensional form. To evaluate the resistance effects of the free-surface in the calculation of the normal depth, the dimensionless-form of Manning¡¯s equation with free-surface weight factor is introduced herein. The design charts reported previously were modified.
%U http://www.ajol.info/index.php/wsa/article/view/73320