| 1. | As a result, corrections for submerged flow in Palmer-Bowlus flumes have not been published.
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| 2. | There are two conditions of flow that can occur in a Parshall Flume : free flow and submerged flow.
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| 3. | If H b / H a is greater or equal to S t then it is a submerged flow.
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| 4. | If there is submerged flow, adjustments need to be made in order for the Parshall Flume to work properly.
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| 5. | As a result, it is important to set the flume so that it does not experience submerged flow conditions.
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| 6. | Since H b / H a is greater than or equal to 0.7, it is a submerged flow.
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| 7. | For submerged flow a secondary head measurement ( Hb ) is required to determine the flume is submerged and the degree of submergence.
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| 8. | For submerged flow, a depth of flow needs to be taken upstream ( H a ) and downstream ( H b ).
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| 9. | The measurement calculations are the same as for free-flow in a standard Parshall flume, but submerged flow cannot be adjusted for.
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| 10. | Submerged Flow when the water surface downstream of the flume is high enough to restrict flow through a flume, submerged flume conditions exist.
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