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First Flush Aug 2003

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SUDS Performance Data 2003

Using the partnership's 2003 water quality sampling results, the Environment Agency (EA) analysed SUDS performance in 2003, comparing the newly created SUDS with two well-established on-line ponds further downstream.  

In brief, the EA's analysis of our water quality sampling for 2003 found:

 

Faecal coliforms

Ammonia

Nitrates

Suspended Solids

BOD

DO

SUDS

significant decrease

significant decrease

_

_

significant decrease

significant decrease

Coy Pond

significant increase

significant increase

_

significant increase

_

significant decrease

Alder Road Pond

_

_

significant decrease

_

_

significant decrease

BOD = biochemical oxygen demand

DO = dissolved oxygen

The 'significant decreases' in faecal coliforms, ammonia and BOD at the SUDS site is a triumph!  Evidence of this can be seen in the graphs below.

Decreases in suspended solids was good, but couldn't be called significant.  Nitrates are not a significant contributing factor to Bourne stream diffuse pollution problems (classified as 'moderately low') and so those results are not a disappointment.

The increases in coliforms, ammonia and suspended solids at Coy Pond are the result of the polluting effects of large numbers of waterfowl on a typical municipal pond; in contrast the SUDS at Alderney and Alder Road pond, whilst both supporting some waterfowl, feature reedbeds and vegetated margins which have a beneficial effect on water pollution.  

All ponds appear to have a detrimental effect on levels of dissolved oxygen; this can be overcome by creating weirs and other oxygenating features in-stream.  

Further evidence

Charts below illustrate mean data collected over 15 weeks between 28 May - 10 September, including the sampling during heavy rainfall on 28 August.

  • Graphs showing evidence of successful 'first flush' treatment by SUDS on 28 August 2003 are available separately.

SUDS sampling sites (lagoons & wetland)Significantly, the SUDS demonstrate successful treatment of bacterial pollution (total and faecal coliforms and enterococci, ammonia and BOD (biochemical oxygen demand).

To locate the three SUDS sampling sites referred to in the charts below, see the enlarged plan

 


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