so a followup question would be, if your pond was being built and you were shooting for a depth of 10' or so. Would it be wise to dig a crater in the middle of the deep part maybe 15' wide and another 6'-8' deep? Then put the diffuser down at 16-17' deep? That way you don't have a pond that is that deep all over (added costs), but the diffuser takes advantage of extra depth to produce bigger bubbles by the time they hit the surface and you get a bigger plume as the bubbles have more height to ascend?

You could incorporate this diffuser crater into ponds best at time of new construction.