How does the subsurface drainage, filtration, and separation functions can be accomplished?

3. A 2" nominal diameter pipe has 1,000 BOPD of oil flowing through it. The pipe ID is 1.988 inches and the oil has a specific gravity of 0.85 and contains 3% CO2. a.) What is the erosional velocity in this pipe? b.) What is the actual velocity of the oil in the pipe? c.) Can this pipe be effectively treated for CO2 and why or why not.

trapezoidal section constant velocity horizontal flow grit channel is discharging unacceptable amounts of grit into the primary facultative pond of a stabilization pond. In addition the channel overtops regularly with peak wet weather flow during normal rain storms. An initial investigation confirmed levels of grit present in the particular wastewater to be within normal loading levels. Furthermore, the provision for grit storage capacity in the channel is adequate for the operational cleaning-out cycle employed.According to the authorities, the likely cause of the grit discharge problem is that the channel length is inadequate for settling out the nominal particle size required.Assume 1. Average dry weather flow (ADWF) = 5000m3/day 2. Peak dry weather flow (PDWF) =13000 m3 /day 3. Peak wet weather flow (PWWF) = 15600 m3 /day 4. For settling out particles ≥ 0.20mm with a constant horizontal flow velocity of 0.3 m/s, the required channel length (L) is given by L=15d 5. The existing grit…

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Why the percolation rate can be related to the coefficient of permeability of a soil?