Abstract:In this paper, the free overfall in rectangular channel with a different slopes and bed rough
distribution was studied. Bed roughness was made of wood allocated in three different cases: two, three
and zigzag rows. The aim of this study is to obtain discharge equations for free overfall depending on
brink depth and slope. Three empirical equations proposed for calculating discharge. These equations
influenced by slope, channel bed roughness as well as method of roughness distribution. Three rows
bed roughness having grater effect on these relationships at steeper slopes.
the average values of hc/he at smooth bed is greater by (4%) with respect to that for bed rough at
two rows, by (19%) with respect to that for bed rough at zigzag rows and by (24%) with respect to that
for bed rough at three rows, so that values for three rows rough and horizontal channel is greater by
(4%) with respect to that for channel slope at (1/200) and by (14%) with respect to that for channel
slope at (1/100).
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