Examples include sand, gravel, ash, glass and metal fragments. A device built in stormwater channels for capturing sediment and rubbish. Groundwater Water that is found below the surface, usually in porous rock or soil or in underground aquifers. Infiltration Water entering the sewerage system through cracked pipes or faulty joints. Licence Mechanism used by the NSW EPA to regulate and control environmental pollution.
Litter rack A stormwater control device for capturing sediment and rubbish.
Megalitre Measurement of volume equal to one million litres. One megalitre is approximately the volume of a one metre deep Olympic-sized swimming pool. Microfiltration A pressure-driven membrane operation in which very fine particles or other suspended matter are separated from a liquid. Microfiltration is capable of removing suspended solids, bacteria or other impurities. Membrane pore sizes are slightly larger than those used for ultrafiltration.