Harvested rainwater can be used to water plants.
Harvesting rainwater in rain barrels is an ancient practice that has grown in popularity in recent years because of its environmental benefits and cost effectiveness. The practice is especially beneficial in urban areas, where most rainwater collects pollutants from roads before it flows into the stormwater drainage system and re-enters rivers and streams. Collected rainwater can be used for washing, for gardening and even for drinking if proper filtration systems are applied. But rainwater harvesters should be aware of common problems that could turn a well-meaning effort into a major headache. Does this Spark an idea?
Overflow
Home rainwater harvesting usually involves placing barrels under gutters or other drainage systems that direct water from a roof or other surface. It is important that the barrels are monitored regularly so they do not overflow. Regular water overflow can cause damage to the foundation of your home or other related problems.
Barrel Type and Placement
Rain harvesting requires a food-grade container meant to hold liquid. Problems will occur if a trash can or similar container is used. A common trash can will not be able to withstand the pressure of water over long periods. Barrels placed on uneven surfaces can also cause complications. When a barrel fills, the weight of the water can easily cause it to tip over if it is not on a firm, even surface.
Winter
If winter regularly brings freezing temperatures where you live, your rain barrel can get warped, cracked or weakened. The freezing and thawing of water in the barrel will cause the volume of water to expand and contract, exerting stress on the barrel's surface. Store barrels upside down in the winter to keep them clean of debris for use when it warms up.
Safety
Standing water in any container is a safety hazard for children, given that drowning can occur in as little as a few inches of water. Animals can also get trapped if barrels are not properly covered. A barrel should never be uncovered. Top the barrel with a permeable screen or top that will allow water in but keep everything else out.
Mosquitoes
Mosquitoes breed in standing water, making rainwater barrels an ideal location for them to reproduce. Mosquitos can reproduce in about ten days, so try to use the collected rainwater within that time period. Alternatively, top the barrel with a fine grate or screen that prevents mosquitoes from accessing the water.
Pollution
The rainwater you collect almost always will contain some contamination from leaves, bird droppings, dust or other natural causes. This water can be used for irrigation, but it is not safe to drink unless run through a filtration system. Some types of roofing contain too many contaminants for rainwater harvesting. Do not harvest water that runs off of tar, gravel or asbestos shingle roofs, for example. Other possible contributors to pollution are gutter systems that contain lead soldering or lead-based paints. The rainwater itself may also be polluted if you live in an area with significant industrial pollution
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