The soakaway being constructed in ground conditions which are non-permeable such as sandy clay, silt clay and clay. This would result in the effluent that discharges to the soakaway filling the soakaway and subsequent flooding of the septic tank, or potentially effluent bursting out of the ground causing a health hazard.
It is important that the percolation characteristics of the ground are suitable in both summer and winter months. To identify whether the ground conditions are suitable for a drainage field / soakaway and to determine the size required it is necessary to conduct a Percolation Test. Without the results of a Percolation Test there is no way of knowing the size of drainage field / soakaway required or if this disposal method would indeed work.