For just under fifteen dollars I purchased 25 feet of corrugated hose and an attachment for the downspout.
I then attached it to the rain gutter and used zip ties to attach it to the fence line running behind the greenhouse.
All the while rain clouds threatened to dump the expected record rain fall.
At 10:00 pm I braved the rain to check on the water level. Completely full and running off the top of the tank. 300 gallons in seven hours......good old Oregon rain.
I have a small electric pump that I will pump the stored rain water into the greenhouse where I have a 55 gallon tank that I use to water my orchids and seed trays.
Rain water can make for some happy orchids