Check out this Rain Barrels for Alumawood patio covers. They can be used on the rain gutter system that comes with the solid Alumawood patio covers.

Rain Barrels on Alumawood patio cover.
Rain Barrels on Alumawood patio cover.
Rain Barrels on Alumawood patio cover.
Rain Barrels on Alumawood patio cover.

Here is a link to the kit from Home Depot.
Rain Barrel Kit – Home Depot – Click here