| 摘要 |
A flow measuring flume is described which is compact, cost-effective, self-cleaning and of adjustable capacity. This flume is applicable in the chemical water treatment of acid discharge streams from coal mining operations. It incorporates the self-cleaning advantage of the Parshall venturi flume but without the fixed throat size limitation of a venturi. It further incorporates the adjustable capacity of the notched weir type flow meter without the debris blocking characteristic of the dam like weir. The flume comprises a rectangular open channel with a triangular base and with a discharge opening in one of its two side walls, adjacent to the common corner. A sliding door is used to adjust the discharge opening width, but does not alter the geometric similarity or flow discharge characteristics per unit width of outlet. In addition this flume has one side wall higher than the other for the purpose of protecting equipment from flood damage. When used for chemical water treatment a tank and flow head measuring well can be safely mounted behind the high side wall. The flume discharge nappe springs clear from the flume and drops down on a built-in vortex generating spillway, which maximizes aeration and mixing of the flow.
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