ABSTRACT
T h e mos t impor tant use of the s l o p e - a r e a m e t h o d is for the indirect determinat ion of flood discharge, normal ly after the flood has passed. It m a y also be used , however , whe re the flow is affected by backwater . T h e m e t h o d consis ts o f the es t imat ion of three basic factors: first, the area of the average cross-sect ion in a longitudinal reach of channe l of k n o w n length; second , the s lope o f the water surface or the s lope of the energy gradient in the same reach of channel ; and third, the character of the s t reambed so that a suitable roughness factor m a y be chosen .
