This is a 1100 gallon Bushman low profile tank.  The base is made up of pebbles to create a solid surface.  The initial leaf screen and first flush is attached to the garage.  The first flush then moves the water under the side walk with a "wet conveyance" and then up and into the tank.  The tank has a rain basket in the top to screen out small debris and insects.  The overflow also has an insect screen built in.  The homeowners have since added several 100 gallons in rain barrels and a larger 1500 gallon tank.  They report all are full with recent January rains and are happy to have the water for this spring and summer!  The system was designed by Roger Manley of Central Coast Rainwater Harvesting and installed by Precision Plumbing 831-633-6145.