today i thought id sort out the subsidance issue i have.
When i built it, the front right corner was just over 1" too low, due to me blagging the build without a spirit level, since filling it up the extra mass has caused it to sink further.
Sunk the water down to ground level, about 4000L flooding my entire lawn, made myself a wooden wedge, slegdged it under the sleepers and stacked up slate under. That corner is actually raised 4" higher than before although doesnt look it. Should be able to get 2" more level on the pond now. Testiment to the build of the sleepers, that corner joint took the 400kg+ weight of wood when being chocked up!!