الفهرس 
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Abstract
There are relatively few investigations for computing the required stilling basin length for DROP structures. This length is mainly divided into two parts, the first one is the length at which the falling nappe strikes the basin floor ?DROP Length?, and the second part is the hydraulic jump length. This research work deals mainly with the determination of the DROP length and some characteristics of freenappe in both cases of broad and narrow crested weirs. Theoretical and experimental studies were carried out for smooth horizontal rectangular channel having subcritical approaching flow condition. The momentum equation and Newton<U+2019>s laws of motion were used to derive theoretical DROP lengths formulae for both broad and narrow crested weirs with vertical downstream faces. The procedure of dimensional analysis was applied for deducing the dimensionless parameters representing the governing factors of this problem. Experimental results of the present investigation were represented in the form of tables and graphs. These experimental results included the DROP length, the angle of upper nappe with the basin floor, the brink depth, the upper and lower horizontal nappe lengths, and the pool depth beneath the nappe, in addition to the upstream water surface profiles. Comparative study between other research works and both the suggested design formulae and experimental results of this investigation was performed.