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run-off collection is established, as it is on most modern roads (at least in the urban situation), the water collected by such systems is usually considered as at least partly contaminated due to it picking up motor oils and fuel spillage of road surfaces. It will also usually contain grit and organic matter as well as in many cases litter/rags/other material from breakdown of road surfaces, tyres interacting with the roadside materials/kerbs and the human insistence on throwing their litter out of the vehicle window, anywhere but in the bin (either public or domestic).


This source may also contain materials generated from sites such as road works, construction sites or even waste sites where materials are picked up by tyres and on vehicles and which simply falls off as the vehicle progress on its journey. It may also contain undesirable substances from say farm run-off including fertilisers, pesticides and other ground treatments used in food production simply through surface rain water run-off, particularly after storms or simply mud and ground treatment materials as tractors etc. enter and leave fields, again particularly after rains.


There are probably other more minor sources that 6 drain TRADER | April 2018 | www.draintraderltd.com


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