Save the Rain This Google Map can help you calculate how much
rain water you can harvest from your property. One way to
prepare for the effects of global warming on water supply is to
capture rain water running off of roofs. This process is known
as rainwater harvesting. The rainwater can then be used to flush
toilets, and, even do laundry. Save the Rain can help you
calculate how much rainwater your roof could capture. This is
done by simple calculating the area of your roof, and,
multiplying by the mean yearly precipitation. To use the map
just enter your address and then find the satellite image of
your house. Once you have identified your house all you have to
do is draw around your roof and press 'finish'. Save the Rain
will then calculate the area of your roof, the amount of water
you get in a year and how much water you could harvest. Have you
ever thought about adding solar panels to your house? Roofray
can help you decide. Roofray is an amazing tool built on Google
Maps that can calculate the solar e