Glossary Group: A

A factor applied to point rainfall depths or intensities to generate values applicable to an area.

A device specifically designed to be installed in gravity drains or sewers to prevent backflow from a sewer towards a property or a group of properties.

An index determined by the summation of weighted daily rainfalls for a period preceding the start of a specific event.

The relevant rainfall that takes place before the point in time of interest.

The condition of a catchment before a rainfall event.

Solid sewage-related materials that are visible but create little environmental impact.

The transfer of responsibility for the maintenance of a system of sewers to a sewerage undertaker.

Reduction of peak flow and increased duration of a flow event.