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Glossary

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Best Management Practices (BMPs)

BMPs are techniques developed and designs to reduce the impact of water discharges on the receiving watercourse, i.e. the Bourne Stream.  Now more commonly referred to as SUDS (see below).

Diffuse pollution

Pollutants arising from several different sources; diffuse pollution in urban areas is very likely to be of sewerage origin and run-off from land and impervious areas such as paved streets, car parks, and rooftops during rainfall that often contain pollutants in quantities that could adversely affect water quality.  As opposed to point source pollution.

Epidemiological

From epidemiology: the branch of medical science concerned with the occurrence, transmission, and control of epidemic diseases.

First flush

Following a period of dry weather, substantial amounts of rain falling on an urbanised area will be channelled by impermeable surfaces into the water course, taking litter, food waste, dog foul, oil and other ground pollutants into the stream - the result is known as the 'first flush effect'.

Greywater

As its name implies, greywater is of lesser quality than potable (drinking) water, but of higher quality than blackwater. Blackwater is water flushed from toilets. Water from the kitchen sink, waste disposal and dishwasher is usually considered blackwater because of high concentrations of organic waste. Water from the bath, shower, washing machine, and bathroom sink are the main sources of greywater. The DTI claim that water savings of up to 30% can be achieved by reclaiming greywater from baths, showers and hand basins for non-potable purposes such as toilet flushing or watering the garden.

Gully pots

The primary purpose of gully pots is to trap sediment associated with road run-off. Most retain a certain amount of road run-off, which acts as a water seal, preventing the escape of odour from combined sewers. Gully pots therefore, represent a reservoir of contaminated sediment and a source of pollutants that can be flushed into sewers and watercourses during maintenance or intense storms.

Macro-invertebrates

Invertebrates (or animals without a backbone) that live on the bottom of streams during all or part of their life cycle; "macro" indicates that they can be seen with the naked eye. A good indicator species - their populations fluctuate depending on physical and chemical changes in their habitat.

Point source pollution

Pollution originating from a known (i.e. controllable) source, such as an industrial or commercial premises.  As opposed to diffuse pollution.

Run-off

That element of rainfall which finds its way into streams, rivers, etc., from rooftops, car parks, roads, and other impermeable surfaces.

Stakeholder

"A person with an interest or concern in something" (The New Oxford Dictionary of English).

SUDS  

Sustainable Drainage Systems.  SUDS encompass a wide range of techniques, such as porous pavements, swales, infiltration ditches, ponds, etc., that work by dealing with surface water at source or by slowing down flows to watercourses.

Sustainable development

"Development which meets the needs of the present without compromising the ability of future generations to meet their own needs"

from the Brundtland Report, 1987

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