1. DIRECT SOLUTIONS FOR NORMAL DEPTH USING THE MANNING EQUATION.
2. Chow V. T. (1959). Open‐channel hydraulics McGraw‐Hill Book Co. New York N.Y.
3. Henderson F. M. (1966). Open channel flow . Macmillan Publishing Co. New York N.Y.
4. Jeppson R. W. (1965). Graphical solutions for frequently encountered fluid flow problems . Utah Water Research Lab. Utah State Univ. Logan Utah.
5. McLatchy M. J. (1989). “Newton‐Raphson and normal depths in open channel flow.” Proc. Int. Conf. on Channel Flow and Catchment Runoff for the Centennial of Manning Formula and Kuichling's Rational Formula B. C. Yen ed. Univ. of Virginia 2 983–992.