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Step 1: Water Supplied From Mother Nature
link barrel to downspout. ensure top of barrel remains below level of water entry. I found the Watersaver attachment for the 3×4 downspout pipe works perfectly. In order to enable adequate water flow to the barrel I adapted the Watersaver attachment by drilling out the side and adding a flange for a 1inch PVC fitting. I sealed this by using a rubber gasket and additionally using a silicone sealer. Ensure there is a downward slope between the downspout and the barrel entry.
Step 2: Overflow Back to the Downspout
ensure you have a complete path for water from the downspout to the barrel or barrels then from the overflow to the downspout again.
1″ pvc overflow line from last barrel back to downspout. ensure you maintain a drain angle towards the downspout or sediment could collect in the line.