Glossarydrainage |



An overflow structure across a channel that may be used for controlling upstream surface level, or for measuring discharge, or for both; usually horizontal and constructed as either broad- or sharp-crested.

vacuum sewerage system

A system that operates under negative (sub-atmospheric) pressure to evacuate drainage flows from a property or group of properties; the system may consist of one or more vacuum pumps, a central vacuum reservoir, pipework and interface valves.

time series rainfall

A continuous or discontinuous record of individual events generated artificially or selected real historical events that are representative of the rainfall in that area.