How is the design velocity expressed mathematically for a discrete par

1.	How is the design velocity expressed mathematically for a discrete particle settling process?
A.	V<sub>c</sub> = depth/detention time
B.	V<sub>c</sub> = depth x detention time
C.	V<sub>c</sub> = depth/area
D.	V<sub>c</sub> = area /detention time
Answer» B. V<sub>c</sub> = depth x detention time

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