This is one of my summer projects:
- North Wing: 24×60
- South Wing: 23×48
- Great Room: 26×26
- Studio: 32×18
- Garage: 40×60
Total area of roofs: 6096 sq. ft.
Last year’s rainfall: 17.5 inches
SUPPLY (gallons) = INCHES OF RAINFALL X 0.623 X CATCHMENT AREA (sq. ft. of roof) X .90 (runoff coefficient for a metal or asphalt roof)
= 59,815.476 gallons of rainwater to try collect this coming winter.
Oy vey!