Rainwater Tank Plumbing Fittings Installation – Part 2

Instal Tank Overflow

Installation and plumbing a Rainwater Harvesting Collection Tank for drip irrigation during a drought

Next I’ll tie the tether for the float to one of the pipes to keep it off the bottom.

Installation and plumbing a Rainwater Harvesting Collection Tank for drip irrigation during a drought

I’ll dry fit the overflow down pipe and temporarily secure it for now. I’ll set it in it’s final position when the fence surround is done.

Installation and plumbing a Rainwater Harvesting Collection Tank for drip irrigation during a drought

And shortly after that it started to rain. And water started to fill the tank.

Installation and plumbing a Rainwater Harvesting Collection Tank for drip irrigation during a drought

This occurred to me after I had put my system together and I realized this is something I should have tested first. So I put together a rig to see how much water might end up running over into the first flush chamber when the gate valve is open.

After-the-fact Testing

Installation and plumbing a Rainwater Harvesting Collection Tank for drip irrigation during a drought

There wasn’t a lot, so, I’m not too worried about that.

Installation and plumbing a Rainwater Harvesting Collection Tank for drip irrigation during a drought
Installation and plumbing a Rainwater Harvesting Collection Tank for drip irrigation during a drought

In the winter when we get a lot of rain I’ll remove the float ball and slow release pin hole washer in the bottom of the first flush so water can drain quickly out the small clear hose into the 4″ drainpipe.

Installation and plumbing a Rainwater Harvesting Collection Tank for drip irrigation during a drought

I then swapped out the straight tee for a sanitary tee. It has a sweep or curved section and what I found was there was no water dripping from the horizontal pipe.

Installation and plumbing a Rainwater Harvesting Collection Tank for drip irrigation during a drought

So, if I was going to build my system again I would use the sanitary tees instead of the straight tees.

Installation and plumbing a Rainwater Harvesting Collection Tank for drip irrigation during a drought

So I hope you have enjoyed this post, and thank you so much for reading. If I make any further improvements or changes I’ll post them here.

And, while you are here, please hit the Support Link to help us make more projects and videos like this. We really appreciate anything you can do to help us out!


Jump to:

Part 1Pour a Rainwater Tank Foundation
Part 2 – Rainwater Tank Plumbing and Fittings
Part 3Rainwater Tank Pump and Irrigation
Part 4First Run of Tank Drip Irrigation System


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