Dictionary of Water and Waste Management, Second Edition

W: WAC WWDR

WAC waste treatment

WAC

Waste Acceptance Criteria.

waffle bottom anaerobic digester

An anaerobic digestion tank built egg shaped which aims to reduce the need for cleaning. The digester forms steep sides in the waffle at the bottom which facilitates the removal of grit.

wall collection devices

See impingement separator.

Wallingford tables, HR Wallingford tables, Barr and HR Wallingford tables

A set of tables giving solutions to the Colebrook-White formula for flows in pipes, sewers and channels. The most recent additions are the Barr and HR Wallingford tables.

WAMITAB

In the UK, the Waste Management Industry Training and Advisory Board, which is an organisation that gives training to personnel working in waste management. They issue certification on successful completion of their courses.

Warburg respirometer

A type of respirometer. See Figure R.5.

WARC

Waste and recycling centre.

warning stage

The water level (stage) in a river above which flooding may become an inconvenience or dangerous.

washing of sludge

Elutriation.

washlands

The part of the flood plain where water is stored in time of flood.

wash load

Very fine solid material (typically less than 0.062 mm diameter) that moves down a river in suspension. It is part of the suspended load. See sediment load.

washout

In air pollution, removal of particles or gases by collision with descending raindrops. Compare rainout.

washout valve, scour v.

A valve provided at a low point in a main which allows debris to be flushed out at a point...

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