I am looking to make a retaining wall that is approx.10m long and 1.5m high. I would like to have a go at making this myself but it will be the first time laying blocks, I have recently renovated my property so fairly competent on the tools. Im not fussed about the looks of the Wall as I won't be seeing it (Wall would be retaining soil on one side, the step down leads into a field). I figured Concrete or breeze blocks would be the cheapest. is that right?..... Would anyone be able to advise on the size that the foundation should be (depth/width) and also the size of the blocks and which orientation they should be laid in- either laid flat so that the wall is thicker or conventionally? Would it be recommended to lay a perforated pipe along the wall? if so, what size and how many?