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The Cutthroat flume is a class of flow measurement flume developed during 1966/1967 that is used to measure the flow of surface waters, sewage flows, and industrial discharges. Like other flumes, the Cutthroat flume is a fixed hydraulic structure. Using vertical sidewalls throughout, the flume accelerates flow though a contraction of sidewalls until the flow reaches the "throat" of the flume, where the flow is then expanded. Unlike the Parshall flume, the Cutthroat flume lacks a parallel-walled throat section and maintains a flat floor throughout the flume. The design of the Cutthroat flume is standardized but not covered by a national or international standard (unlike the Parshall flume). The flumes are not patented and the discharge tables are not copyright protected. A total of 16 standard sizes of Cutthroat flumes have been developed, covering flow ranges from 0.3536 gpm (l/s ) to 54,801 gpm (l/s ).〔(【引用サイトリンク】title=Cutthroat Flumes for Flow Measurement )〕 == Free-flow equation == Under free-flow conditions the depth of water at specified location upstream of the flume throat can be converted to a rate of flow. The free-flow discharge can be summarized as 〔(【引用サイトリンク】title=Sampling Guide for Environmental Analysis )〕 : Where * ''Q'' is flow rate * "C" is the free-flow coefficient * ''K'' is the free-flow length coefficient for the flume * ''H'' is the head at the primary point of measurement * ''n'' is the free-flow exponent Both “K” and “n” vary by flume length alone. Table 1 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Cutthroat flume」の詳細全文を読む スポンサード リンク
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