For adults.A rain barrel is placed under a gutter’s downspout next to a house to collect rain water from the roof. The barrel holds about 50 gallons of water which can be used to water your lawn, flowers, shrubs, and trees. Rain water harvesting can help save money on your water bill, prevent basement flooding, and reduce flooding in local rivers streams and streams. Participants will be shown step by step how to build their own rain barrel and learn how to install it at home. Meet in Garibaldi Hall. Advance registration required; call 973.228.8776.