Update: here’s a video detailing it all!
These are our main rainwater collection tanks that can capture up to 550 gallons from just 1″ of rain. I used 2 275 gallon IBC tanks purchased on Craigslist for $75 each. I connected them to the gutter with standard PVC pipe. The first 3 tubes on the left are a “first flush” system that filter out the first 20-30 gallons of water. I plan to build a fence around them to make it look nicer and the goal for next year is to hook them up to my PVC drip irrigation system with a soil moisture sensor connected to a computer controlling the watering schedule. I’ll be posting more details about how I built this soon.