OFF GRID Rain Harvesting System – Part 3 – plumbing and fittings

DIY Overflow Siphon

make a tank overflow siphon
make a tank overflow siphon

For this tank overflow I’ll use standard fittings to create a siphon. It’s made from three 90 degree elbows and an angled pipe.

make a tank overflow siphon

When the tank is full this siphon will skim water off the surface and send it down a pipe to the dry well that I dug in Part 1 of this series.

Tank Overflow Screened Outlet

make a tank overflow siphon

Now I’ll glue that in place.
You can buy a siphon formed from one piece but my suppler was out of stock. I think it works out to be cheaper than making your own when you add up the cost of the fittings. And there’s options without a siphon that use a simple 90 degree fitting with screen to keep mosquitoes out.

make a tank overflow siphon

In case the siphon dries out I’ll add a screen on the pipe end that runs into the drain just in case. And that’s done later.
Next I’ll tie the tether for the float to one of the pipes to keep it off the bottom.

tie off the lanyard for the float and screen inlet

On the other side of the tank I’ll add a gauge. It’s a float on a spring coiled spool that you set to your low and high water points.

Instal a Rainwater Tank Gauge

install a level or volume gauge on the tank
install a level or volume gauge on the tank
install a level or volume gauge on the tank
install a level or volume gauge on the tank

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