![]() ![]() Sixteen experiments were performed to validate our proposed method. ![]() This study proposes new formulas, which can cover continuous and discontinuous flow and can consider the influence of the release of air from liquid on the flow velocity. We re-examine the siphon process and recognize that the existing classic formula of the flow velocity of a siphon is only applicable to continuous flow however, the flow of a siphon may be discontinuous flow. Siphons have been known and used since ancient times and are still widely used. Instead, this study has found that once a downpipe is flowing full, it is possible for pipe-full flow conditions to be maintained over the entire pipe length. #FREE ALTERNATIVE FOR SOUND SIPHON FULL#The results of this study are significant in that they do not support the common theoretical assumption that there is a limiting length of a siphonic downpipe over which pipe-full flow may occur before gravity causes the water to accelerate enough for it to no longer occupy the full cross-sectional area. Seven different overflow configurations, each with five different downpipe lengths, are investigated in terms of maximum flowrate and corresponding water depth in the gutter. An alternative low-cost technique that is explored in this study is to connect each overflow outlet to a single, vertical downpipe. Many buildings that have siphonic roof drainage systems currently incorporate a separate secondary overflow system, which is quite often also siphonic. This paper describes an experimental investigation of alternative overflow systems for roof structures that are drained siphonically. ![]()
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