To use this calculator input the dimensions of your roof only area connected to rainwater harvesting system and the amount of rainfall in inches.
Roof rainwater collection system.
Greenhouse roof has the highest collection efficiency most surfaces are a ok.
1 of rain on 1 000 sf roof will yield 623 gallons roof area m2 x precipitation amount mm amount collected liters.
There s just a short list of rooftop surfaces that rainwater harvesters should avoid.
The good news is most roofing materials are suitable for rainwater harvesting.
1 standard 1 inch hose spigot with in.
Figure out what you already have on hand then gather the following supplies.
Pipe threads so you can access water from your rain barrel.
Read down the list for info on roofing materials for rainwater harvesting.
A first flush diverter is a contraption that redirects the first purge of water coming from the roof during a storm away from the rainwater tank.
Earthminded diy rain barrel diverter and parts kit water collection system to convert containers into rain barrels catch rain water for outdoor chores rbk 0001 4 6 out of 5 stars 644 31 98 31.
Here s a handy little calculator to help you estimate how much rainwater can you harvest from your roof.
Rainwater collection calculation formulas and equations roof area ft2 x precipitation amount in x 0 623 amount collected gallons easy formula to remember.
A step beyond screens is to add a first flush diverter aka roof washer to your rainwater collection system.