Plenty of dams leak, and almost always it comes back to how they were built, not bad luck. A dam that holds water for decades is built on a few simple things done properly.
The "key" is a trench dug down through the topsoil into solid clay under the wall. It locks the wall into ground that holds water instead of letting it seep underneath. Skip the key and you are building a wall on the very layer water wants to escape through.
Loose fill leaks. The wall and the floor need to be built up in layers and compacted as you go, so there are no soft spots or air pockets for water to find. It is slower, but it is the difference between a dam that holds and one that drops every dry spell.
A leaking dam can usually be reworked — re-keying, rebuilding the wall and compacting properly. If your dam is dropping faster than it should, 0439 732 567 and we will have a look at what is going on.
Got a job in mind? Call us on 0439 732 567 or send through the details.