Surface water drains normally discharge to a watercourse or indirectly into underground waters via a soak away.   Contamination of surface water by oil, chemicals or suspended solids can cause these discharges to have a serious impact on the receiving water.  Interceptors protect receiving waters from such pollutants.


Interceptors remove pollutants from effluent and allow cleaner water to pass into a surface water drainage system.  Pollutants are retained for removal and disposal.  Interceptors work by allowing the pollutants and water to naturally separate.  Pollutants float to the surface of the water for easy removal.  Silt settles within the unit and can be easily removed.  All JFC Inceptors are manufactured to IS EN ISO; 9001:2000 and conform to European Standard PR EN 858 – 1 & 2.

ByPass Interceptor
  • Used on low risk sites (Car Parks)
  • Sized in litres per second flow
  • Available in Class 1 format
JFC BPDA Interceptor


Product Code Drainage Area m² Peak Flow (L/s) Nominal Flow (L/s) Oil Storage (L) NSB Ref
BPDA1950 1,950 3.5 35 l 52.5 3.5
BPDA2500 2,500 4.5 45 67.5 4.5
BPDA3300 3,300 6.0 60 90 6
BPDA4400 4,400 8.0 80 120 8
BPDA5555 5,555 10.0 100 150 10
BPDA6900 6,900 12.5 125 187.5 12.5
BPDA8300 8,300 15 150 225 15
BPDA10000 10,000 18 180 270 18
BPDA13333 13,333 24 240 360 24

Best Management Practices

Best management practices should be maintained to ensure a clean network at all times. Sinkable solids and floatable contaminants should be prevented where possible from entering the unit by means of a dedicated silt traps and/or sumped catchpit manhole (s) upstream thus preventing potential problems.

It is important to note that a large amount of the settable solids are present in the network during construction and this is mainly due to the silt/grit present in construction runoff. To account for this, the following inspection and maintenance guidelines are recommended as best management practice:

  • Initially inspect the catchpit manholes on a monthly basis (periodically thereafter)
  • If cathchpit is 30% full, de-sludge the catchpit (s) with a standard vacuum tanker
  • If large amounts of silt present, additional catchpit manholes with 90 degree bends may be required
  • When construction is finished a full camera inspection is recommended on the network
  • Any contaminants found in the line should be flushed/jetted and the catchpits de-sludged

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