I am building a home that I hope to add a large plastic underground water storage tank that has the gutters from the house flowing into so as to "recycle" the rainwater for an irrigation system. My concern right now is that I prep properly for this project. THere is approximately 3500 square foot of roofing and I will be using 6" gutters (it is a combination of 10/12 & 12/12 pitches on the roof) What type of pipe should I use? I have ruled out the cheap black pipe but was wondering if I shoud rough it in with 4" schedule 40 or should I use green sewer line pipe? Also, where can I find the quality connectors to attach the gutters to the pipe? And finally, we are looking at a total of 8 downspouts...should I have them all feed into a single 6" pipe or multiples? For the time being, I plan on running them (all the pipes to daylight, but in the general vicinity of where I plan on adding the storage tank to later. If you guys have any websites I can check out for advice on how to properly plan this I would be VERY grateful as well.