Provides a “usable” amount of water for watering or other outdoor use by collecting and storing rainwater in large tanks, thus decreasing the need for other sources of water.
Prevents runoff of roof water into storm drains or into rivers and streams, thus decreasing combined sewer overflows or stream flow volatility.
Helps recharge groundwater sources so that more water is available to keep rivers running and wells producing during dry times.
Helps to re-direct storm water away from foundations where it can seep into basements and cause damage.
