Rainwater that flows off roofs or downspouts can be easily harvested.
Harvesting rainwater provides both environmental and economic benefits. In areas where yard and garden plants require watering, employ a rainfall collection system. These systems save property owners money because they do not have to pay extra for the water they are using for irrigation. Using harvested rainwater also can help to prevent droughts as well as flooding that can be caused by rainwater runoff. The size storage tank needed will depend on the size and intended use of the collection system. Does this Spark an idea?
Passive Collection System
No tank is required for a passive rainwater collection system. Such systems work better in climates with average or above-average rainfall. Soil and mulch are used in such a way as to maximize the benefits of regular rainfall. Special channels and shallow basins are dug directly into the soil, allowing the rainwater to naturally percolate through the soil. Mulch is used around plants to keep them moist and preserve them from the drying effects of the sun.
Purchased Container
Ready-made rainwater collection barrels are available for purchase. These range in size from 50 to 65 gallons. The arrels come already fitted with lids and screens, as well as a spigot that allows you attach a hose or fill a watering container with the harvested water. Depending on the size of the area you need to water and the amount of rainfall you receive, a single barrel may be enough to meet your needs. If not, a series of barrels may be used by connecting the barrels to one another via tubing or a pipe.
Repurposed Container
Construct a rainwater collection barrel easily from other less expensive containers. This structure also allows for a different-sized container to be used. The barrel will need to have a fitted top and screen as well as a spigot. Containers that are dark and opaque inhibit algae growth on stored water. Wooden wine barrels as well as food grade plastic barrels or containers can be turned into a rainwater collection barrel.
Larger Systems
If the rainwater collection system is for a larger, commercial entity or if the system will be filtered and used for regular household water consumption, a larger storage tank or cistern will need to be used. These types can be built either above or below ground and can be constructed from a variety of materials. Estimate the size needed for a system that will supply all household water based on the amount of water used each month and the amount of rainfall that falls each month.
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