A percolation test measures how well the soil drains and determines its suitability for a soakaway or an attenuation tank. The test involves digging a trial trench of specific dimensions and timing the water as it drains. The pit is filled to the expected tank level, and the time it takes for 25% and 75% of the water to disappear, as well as the emptying time, is recorded. The test is repeated three times for consistency, and the average of the results is taken.
For tank lengths exceeding 10 meters, the process is repeated at intervals to ensure consistent infiltration rates. Calculations are then done using the recorded values to determine the median value and the soakaway area. It involves working out volumes, surface areas, and timing calculations, which can be facilitated with provided documents.
The key is to conduct the test accurately, record measurements diligently, and consult with a qualified professional for further assistance in the calculations.
