The permit writer can specify monitoring locations with either a narrative description or a diagram of the permittees. Parshall flume or at a location in a sewer with hydraulic turbulence.
Flumes Trapezoidal Rectangular U Parshall
Figure 66 Diagram and dimensions of Parshall Flume.
. Weirs tend to enhance the settling of solids immediately upstream and the accumulation of floating oil or grease immediately downstream. Figure 66 shows dimensions and diagram of flume. Such locations should be avoided for sampling.
The flume is also independent of the velocity of the fluid as it enters and as such the application does not require damming or a stilling basin. The flume provides a little more accuracy by precisely channelling the flow.
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Flumes Trapezoidal Rectangular U Parshall
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