Hi SaveH20
Wonderfully detailed response, which is going to take me some time to digest. Just a couple of queries... I was assuming the Thintank would receive the first load of water and the round tank would be the settling tank. That's why I put the round tank nearest the easement and furthest from the drainpipes. Is the height difference between the two tanks the reason for making the Thintank the settling tank?
The distance from the small wall to the drainpipe (not including the drainpipe) is 57cm.
Also we aren't going to have a footpath bordered with grass/dirt verges to run a pipe under - the whole area is going to be concreted, so we would be laying the pipe under the concrete and up through the concrete into the tanks?? And how would the pipe from drainpipe B meet up with the pipe from drainpipe A if the latter is under concrete? Sorry for the basic questions but this thread doesn't have the words "technically challenged" in the title for no reason. I've uploaded a couple of photos of the area as it currently looks.
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The following is a picture of drainpipes B and C so you can see that the pipe from drainpipe B to the tank will be running above the concrete.
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