Examples of Absorption trench in a sentence
Exception: Absorption trench systems that use the loading rate calculations for absorption beds shall have a minimum of 6” of crushed stone below the distribution pipe.
Absorption trench systems may be constructed using prefabricated leaching chambers with a minimum H-10 structural loading rating, instead of crushed stone.
Absorption trench systems placed in earth fill can only be installed over natural soils with a percolation rate range between five and 60 minutes per inch; and absorption bed systems over soils with a percolation rate range of five to 30 minutes per inch.
Absorption trench construction will involve: excavating the trench (around 650 mm deep); filling the base of the trench with gravel or broken rock; laying a perforated 100 mm PVC pipe in the centre of the trench; overfilling the pipe with gravel or broken rock (generally to a total depth of around 450 mm); laying a separation layer of black polyurethane or similar; and compacting backfill over the top (around 200 mm depth) with a slight mound left above surrounding ground level to allow for settlement.
The installation of the following disposal systems is permitted with the approval of Council: Absorption trench or Evapo-Transpiration Absorption (ETA) Beds as per AS/NZS 1547; Sub surface irrigation; and Mound Systems.