a. Drainage
Most existing sites will have two types of drain. Surface water drains, including land drains and most road drains, should carry only uncontaminated rainwater, as they will lead to a local river, stream or soakaway. The foul water
drain is designed to carry contaminated waste water safely to a storage lagoon, treatment system or sewage works for treatment. In the case of an isolated house, or a small community biological treatment plant, care should be taken not to overload this by disposing of disinfectant or grease down the foul drain .agreement from the local sewerage undertaker is required before you connect to the public foul water system.Where significant work is being undertaken on an existing site or a new development, the Agencies encourage the
consideration of an alternative approach for surface drainage, which uses a combination of techniques known collectively as Sustainable Drainage Systems (SuDS). This approach has significant environmental benefits and may
also have lower installation costs. See Reference 6 for further details.
b. Surface water treatment
Surface water can be contaminated with silt, heavy metals, chemicals and oil, which can be damaging in watercourses and groundwater. In many cases, it will require treatment by controlling the pollution at its source or just before the discharge point. SuDS may provide a suitable solution . In areas where there is a
high risk of oil pollution, it may be necessary to install an oil separator to protect the surface water system and reduce the risk of pollution.
Surface water can be contaminated with silt, heavy metals, chemicals and oil, which can be damaging in watercourses and groundwater. In many cases, it will require treatment by controlling the pollution at its source or just before the discharge point. SuDS may provide a suitable solution . In areas where there is a
high risk of oil pollution, it may be necessary to install an oil separator to protect the surface water system and reduce the risk of pollution.
c. Wrong connections
Wrongly connected effluents can cause severe pollution problems, which can be difficult to remedy. Sources of dirty water, such as sinks and toilets, should be connected to the foul sewer and the nearest drain. Manhole covers and gullies should be clearly marked, by colour coding, with red for foul and blue for surface water, and site drainage plans should be readily accessible.
Wrongly connected effluents can cause severe pollution problems, which can be difficult to remedy. Sources of dirty water, such as sinks and toilets, should be connected to the foul sewer and the nearest drain. Manhole covers and gullies should be clearly marked, by colour coding, with red for foul and blue for surface water, and site drainage plans should be readily accessible.
d. Garage forecourts and fuel delivery areas
Because of the potential for pollution from these areas, oil separation is required. Effluent resulting from the cleaning of forecourts must not be discharged to surface water drains, watercourses or soakaways.
Because of the potential for pollution from these areas, oil separation is required. Effluent resulting from the cleaning of forecourts must not be discharged to surface water drains, watercourses or soakaways.
e. Cleaning activities
Wash waters from mobile pressure washers should not be discharged to surface water drains, watercourses or soakaways. Even if described as bio-degradable, detergents are not suitable for discharge to surface drains, so such activities should be carried out in designated areas draining to the foul sewer (subject to the approval of the local
sewerage undertaker). Alternatively, closed loop vehicle wash recycling systems are available.
Wash waters from mobile pressure washers should not be discharged to surface water drains, watercourses or soakaways. Even if described as bio-degradable, detergents are not suitable for discharge to surface drains, so such activities should be carried out in designated areas draining to the foul sewer (subject to the approval of the local
sewerage undertaker). Alternatively, closed loop vehicle wash recycling systems are available.
f . Sewage disposal
All foul sewage should pass to the local foul sewer if possible. If not, other arrangements should be discussed with your local Agency office Most alternatives will normally require the formal consent of the Agency.
All foul sewage should pass to the local foul sewer if possible. If not, other arrangements should be discussed with your local Agency office Most alternatives will normally require the formal consent of the Agency.
g. Chemical storage areas
Drainage from such areas presents special problems and you should consult fully with your local Agency office to minimise the pollution risks.
Drainage from such areas presents special problems and you should consult fully with your local Agency office to minimise the pollution risks.
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