Ruddlesden geotechnical provides advice on the suitability of the ground for foul drainage systems.
Recommendations are provided in accordance with Building Regulations Approved Document H and Environment Agency guidance, based on the percolation values and distance to potential receptors.
If the results of in-situ testing indiacte that percolation value is too high, there might be insufficient dilution between the site and any controlled waters (streams, groundwater, abstraction wells etc.); if the percolation value is too low, ponding of septic effluent on the surface might occur due to inefficient soakage.
Successful Foul Drainage Tests Facilitate Residential Development in Devon
It was proposed to construct a foul water drainage field at a proposed residential development site in South Devon.
Ruddlesden geotechnical undertook in-situ percolation tests in accordance with Building Regulations drainage and waste disposal Approved Document H.
Infiltration rates (percolation values) were provided for use in the design of the drainage field.
As there was no mains drainage in the area, if the infiltration rates had been unsuitable for foul drainage, this would have precluded the development of the site.