Using some easy to find plumbing fittings you can gang together any number of rain barrels to increase irrigation sources for gardens in out of the way areas.
Parts list for ganging 5 water barrels the same way I did.
5- 3/4 inch PVC Bulkhead Fitting
5- 3/4 inch x 3/4 inch x 3/4 inch Tee Fittings
8- 3/4 inch Male Adapters
1- 3/4 inch Male Plug
1- 3/4 inch shut off valve
1- 3/4 inch male pipe thread to male hose thread adapter
1- 10' length of 3/4 inch PVC pipe
1 can of PVC primer/cleaner
1 can of PVC cement
what ever kind of downspout diverter you desire. They make them in many different varieties.