These are possible objectives for this project:
catch water off the roof
remove excess runoff from the building
pump water 100 ft or more
Pump - capable of moving water > 100 ft ($100) and with shut off (additional $60)
Small water storage and pipes from gutter - notice the overflow pipe that goes to the drain
Tank holds 300 gallons and cost about $150.
Large tank - transportation and sighting of this tank are issues
1500 gallons - about $600