The calculation of WEIR OVERFLOW RATE is important in detecting high velocities near the weir, which adversely affect the efficiency of the sedimentation process. When excessively high velocities occur the settling solids are pulled over the weirs and into the effluent troughs.
In calculating the weir overflow rate, you will be concerned with the liters per second flowing over each meter of weir length. The following figures can be assssociated with weir overflow rate in rectangular and circular sedimentation basins.
Flow ( L/s ) Weir overflow rate = weir length (m )
Example 1
If a sedimentation tank has a total of 27 m of weir over the water flows, what is the weir overflow rate when the flow is 90 L/s?
