A virtuous method that allows you to avoid waste and, at the same time, to reduce water supply costs: let’s see how to recover rainwater.
Implement the rainwater collected can be an extremely advantageous from an economic point of view. L ‘ rainwater , in fact, once collected in special containers, can be reused for different applications both domestic and professional.
In the home, for example, rainwater can be safely used to fill toilet cisterns and for cleaning floors, tiles, sinks and sinks, for washing dishes, laundry and even the car, since it originates from condensation at high altitude it is free of mineral waste and allows to avoid the accumulation of limestone, typical instead of tap water.
Furthermore, by organizing an adequate collection system, rainwater can also be used for personal hygiene and for watering orchards and gardens; so let’s see some of the most common systems among those usually used for rainwater recovery .
Do-it-yourself rainwater collection
One of the most popular methods, thanks to its simplicity of implementation even in do-it-yourself mode, is to collect the water directly from the roofs by means of gutters installed with the aid of hand tools , such as hammer and pliers , and power tools such as hammer drills, to drill the holes where to insert the expansion plugs and the pins for fixing the channels.
With this method, in fact, it has been estimated that in one year it is possible to recover up to 800 liters of rainwater for every square meter of roof; just to give a practical example, therefore, from a roof whose surface is equal to 100 square meters, up to 80,000 liters of water can be obtained per year. Even considering the periods and geographical areas subject to low rainfall, the collection rate is in any case around 30-40 liters of water for each square meter of roof.
The water flowing on the tiles is collected by the gutter drainage pipes, whose drain pipes are connected to special rainwater tanks by means of a shunt fitting, which diverts the flow of water from the pipe into the tank; when the latter fills up, it is the same water level that closes the check valve of the fitting and restores the flow in the drain pipe.
Furthermore, filters must be placed in the connections between the drain pipes of the gutters and the tanks to prevent the passage of leaves or other dirt.
Sizing of rainwater collection tank
How big should the rainwater tanks be and where should they be placed ? The answer to this question depends on the type of system you intend to create and what purpose the collected rainwater will be used for.
In fact, tanks and cisterns can have different containment capacities depending on the case, and they also differ in the type of installation; some are made to be placed directly on the floor, while others can be buried or placed inside cellars or underground rooms.
In the latter case, of course, an electric pump will also have to be installed so that the water can be drawn and fed into the domestic water system, or conveyed to the irrigation system.
The greater the quantity of water to be recovered, therefore, the larger and more cumbersome the containers destined to store it will be. Consequently, the filtering systems must also be suitable for the size of the system and the water flow rate of the pipes.
Rainwater for domestic use
As mentioned above, the use of rainwater in the home can not only represent a way to reduce the costs related to water supply bills, but also allows you to extend the life of household appliances as rainwater is free of chlorine and other mineral substances.
However, this does not exempt from the obligation of its filtration, which in this case must not be limited only to any leaves, crushed stone and dust collected from the roof and from the gutters. Even if intended for non-potable use, in fact, with rainwater it is possible to wash laundry and dishes, as well as use it for washing floors and for household cleaning in general; consequently it is preferable that it be as clean as possible in order to avoid potential contamination by pollutants collected from the air during the condensation phase of the rain.
Furthermore, for the water collected for these purposes, it is possible to do without having to resort to the intervention of specialized technicians for the installation, but a do-it-yourself collection system can be equipped by using tanks of modest size to be placed near the gutter drain pipes. Once collected, the water can be used using buckets or by connecting the tank to a pipe that connects directly to the pipes of the domestic water system.
The irrigation of vegetable gardens and gardens
If the rainwater collection system is instead created for the purpose of powering an irrigation system for the garden, or for the vegetable garden, then it is preferable to do things in the best way, perhaps considering the idea of installing an underground tank. large capacity.
If you have enough space and want to save money, you can instead consider the alternative of installing one or more tanks at a level above the ground; but not too much though, to avoid pressure problems. A platform located at about 100-120 centimeters in height on which to place one or more tanks connected in line, can perform this purpose very well; in this way it is possible to do without a submersible pump for drawing water and simply connect, to the base of one of the tanks, a hose equipped with a tap, a hose for watering or a derivation for a drip irrigation system .