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Submerged Thin Plate Weirs with Unequal Beds
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At the time that the study described in the§monograph commenced, all of the published research on§submerged thin plate weirs assumed that the upstream§and downstream beds were at the same level. In§practice downstream beds may be eroded by the flow§over the weir leading to unequal bed levels.§Using laboratory models, this study examined the§discharge over submerged weirs with unequal beds. The§resulting flow pattern was shown to be different to§that of the equal bed case. The approach channel§Froude Number differs from that of the equivalent§equal bed case. The standard formulas derived for§submerged equally bedded weirs were shown to give§incorrect values.§The existing standard formulas for calculating§discharge over submerged thin plate weirs treat§submerged flow as a variation of the free modular§flow. The later part of the study treats flow over a§submerged thin plate weir as a separate flow§condition and proposes an initial form of a new§discharge formula.
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