Oil/Grit Separator Limitations
It may be difficult to find environmentally acceptable disposal methods. The slurry of oily water and trapped residuals cannot always be land-filled, land-applied, or introduced into the sanitary sewer system due to hazardous waste, pretreatment or groundwater regulations
Not suitable for large drainage area
Limited pollutant removal capabilities
Susceptible to resuspension when located on line requires high maintenance
Notes:
Listed here are some drawbacks of catch basins.