Los Angeles is a paradox - our two defining
infrastructures are the aqueduct system that
imports water from across the state at a
staggering environmental cost, and the LA
River - a concretized channel designed to move
rainwater as efficiently as possible out of our
city to the ocean.
Does it make sense to capture rainwater in Los
Angeles? Absolutely! Consider that due to the
large area of a typical collection surface (i.e., a
roof), it doesn't take much rain to generate a
lot of water. One inch of rain falling on a 1000
square foot roof adds up to 600 gallons! And
the yearly average rainfall in L.A. is 15 inches.
15 inches of rain on that small roof could yield
around 10,000 gallons of pure, clean rainwater
- if you had the storage capacity to capture it.
That's why we generally recommend that
people go large - A few 50 gallon barrels
scattered around the property are nice, but
they will rapicly fill up and overflow with only a
Rainwater holds several great advantages over
greywater. You don't have to use it
immediately -with proper prefiltration it can
stay in the tank for months until you need it.
It's also nice to have a source of backup water
for earthquakes or other emergency use. It's
also great for native plants, which can be
challenged by micronutrients in greywater.
1.3 million gallons per second, whooshed away to the ocean.