![]() There are many people around building septic tanks who do not fully understand how they work. In addition how well your septic tank will work is dependant on how well it is designed and built. Septic tanks should be either made from plastics that will give a little with ground movement or be built from reinforced concrete and designed such that in the event of ground movement the tank will move as a single entity and retain its integrity. We should also bear in mind that when a tank is operating it will be holding a metric ton (1,000 kgs) of liquid for each cubic metre, for an average tank this is likely to be as much as 3 or 4 tons. The slightest bit of ground movement, probably even the settlement resulting from the tank's construction, will be enough to crack it. You will see people building septic tanks using lightweight concrete blocks (batako) with a thin skim of cement on the inside. ![]() It is easy to underestimate the forces that a septic tank has to withstand. A well built septic tank will not leak and should be able to withstand earth movements, unfortunately many septic tanks in Indonesia are cracked and leaking. ![]()
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