I reckon that my questions are redundant to you all but here goes and sorry if they are.
The first would be is there a simple design that does not need a elevated flood tank, that is not problematic in operation i.e. good ratio of flooded
to drained bed time? if so can someone describe it or send me a drawing? I have built a 60sf growing bed over 4 -120gal fish tanks, now I need
to figure out how to design the flood drain mechanism hopefully without grid power input. I've toyed with the Bell siphon but I hear that they can be difficult to make work reliably??? Any help will be appreciated. Thanks Eric V.