How should wash water from retail paving and forecourts be managed?

How should wash water from retail paving and forecourts be managed?

Water used on retail paving can collect grit, litter, oils and cleaning products. Its destination should not be left to the slope of the forecourt. Assessment identifies gullies, drainage information, thresholds and potential routes towards neighbouring premises or public space.

The arrangement depends on the site and contamination. Containment, liquid recovery or a lower-water method may be suitable. Covering a drain without controlling accumulating water can create another problem. Drain locations alone do not establish that discharge is appropriate.

Dry debris should be collected before wet work where practical. During cleaning, containment needs checking as equipment moves. Liquid and debris require an appropriate disposal route, and edges, channels and access paths should be inspected for sediment or remaining water before reopening. Existing drainage problems should be discussed in advance. Cleaning removes assessed contamination; it does not repair defective drainage or guarantee the performance of the wider system.