Drip Strive

The EPA Research report on the assessment of wastewater disposal options in low permeability soils was published in January 2016.  Ash Environmental designed and supplied both the Low Pressure Pipe(LPP) and the Drip Distribution system that were assessed in the report.

Both sites had malfunctioning septic tank systems and low permeability soils (T-75). The reported results were excellent and drip results were particularly good.  As a result drip distribution has been recommended for use on new developments in the most impermeable soils with T-values up to 120 combined with a reduction of soil depth to 600 mm of unsaturated soil.  This is very satisfying for us in Ash Environmental and we look forward to working with many of you as the use of these technologies becomes more widespread.

The TCD/EPA study of drip found:

• Uniform and unsaturated soil below drip
• Doubling of infiltration rate without impact
• No surface water ponding
• Effluent was evenly distributed
• Favourable conditions for denitrification
• Reduced nitrate to groundwater likely
• Decrease in faecal contamination of groundwater
• Its use is recommended in low permeability soils up T-120 with 600mm unsaturated subsoil.