This is a cistern I made from some pressure treated 2x6 material and a 55 gallon plastic juice drum. I got the used drum locally for $15 and the wood came from my scrap bin. I chose to use 2x6 material because I had it handy, but if you choose to use 2x4 instead, some dimensions will change. I haven't done any structural calcs, but the water weight alone of 55 gallons of rain will be about 459 pounds, so keep that in mind if you change the size. I use this to water my vegetable garden which is nice and close to the cistern.
To make this, you will need:
Construction adhesive 2-1/2" all purpose fasteners (3) 2" PVC 90 degree elbows Small lengths of 2" PVC 3" to 2" PVC reducing bushing (to attach to your gutter's downspout - your application may vary) (1) 3/4" PVC threaded male adapter (to attach to the barrel's cap) (1) 3/4" PVC 90 degree elbow (1) 3/4" PVC shut-off valve (controls the flow of the rainwater when you use it!) (1) 3/4" slip x 3/4" MHT PVC fittings (this is at the end of the pipe exiting the barrel - you can attach your garden hose to this) (1) 2" PVC coupling (this will form a riser to keep sediment out of your garden water) (1) 2" PVC male adapter (1) 2" PVC female adapter Epoxy
- Aa 55 gallon plastic drum with the screw caps intact
- The following pieces of 2x6 pressure treated (PT) lumber:
- (4) 28.5"
- (7) 24"
- (4) 23"
- (4) 18"
- (2) 13"