here's the initial hook up
still needs tweeking, but it seems like it's gonna work ok. i need to put them up on some cinder blocks i think. right now one has to fill before the second one does. we haven't had enough rain to see if that will happen, but if it doesn't work well enough i can add a valve at the bottom to fill the second one that way. where both would fill together.
really didn't take much rain to get the first near full. if you're local in louisville, the water in the first tank is just from the rain sunday and overnight (3/21). i thought two of these would be overkill, but if the tank transfer works good the second one will come into play with a good rain. i may even have to hook up an overflow if the 2nd one fills. i might hook up the third one, but right now i'm thinking of letting it work on it's own on the other side of the garage.
the pvc tube on the right is my try at making a "first flush" thing. it seems to work, but i think maybe it's a little too small compared to the overall setup. i added a piece of screen just after it to catch some of what it misses, and i saw some kind of micro screen filter i may try to get. i'm not trying to come up with drinking water, but i do want it to not look like a couple of tanks of scummy water in my backyard.
another small benefit i think, the yard doesn't seem as soggy as usual, but it wasn't a real heavy rain so i need to see what happens when heavier spring rains come. still that's about 200 gallons that didn't spill out into the yard.