Collecting rainwater benefits the environment, as our earthly resources are limited. If it can grow, then at least you know the water doesn't kill plant life. A rainwater-collection system can be as simple as a rain barrel at the end of a downspout or as elaborate as a whole-house system, which supplies all the water … Shop rain barrels and a variety of outdoors products online at Lowes.com. This is a great way to reduce water around the foundation of your house during rain. A rain barrel prevents water from entering storm drains, thereby decreasing the risk of flooding. That's typically important for a rain barrel's contents. So, you can always just deal with it and clean it at the end of the season. A typical 1/2-inch rainfall will fill a 50- to 55- gallon barrel. Rain barrels allow you to direct overflow where you want it to go. Oak barrel, rain barrel set 50l, 120l, 240l, 450l. Find rain barrels at Lowe's today. Using a rain barrel can save you a significant amount of money in a season. There's nothing wrong with a little algae in the barrel. An overflow pipe will carry excess water that would normally overflow the barrel to another part of the yard or into another rain barrel. The rain barrel with noticeable wooden structure in a beautiful design with wood grain, durably waterproof and shatter-proof. For each inch of rain that falls on 500 square feet of roof, you can collect 300 gallons of water.