Water falling from the sky has become a symbol of gratuity that Ecology has brought up to date and advocates for its recovery and direct use. So it became good, economical and citizen to provide a recovery unit for domestic use (car wash, garden watering, pool filling etc.). As in the legislation, the evacuation of rainwater must be the subject of a separate circuit in the arrangement of evacuations of a particular house or a pavilion, so it is easy to recover.
- Evacuation of rainwater
- Rainwater collectors
Evacuation of rainwater
Although it is common in the countryside, rainwater is simply evacuated by a natural spreading, this process is often because of residual moisture from the bottom of the walls and only needs to go back by capillary action.
Connect the buried pipelines and gutters equipped with grids, to the collection points to form a line of evacuation of rainwater, quite distinct from other circuits. You will be able to reinforce the tightness of the joints by joints of silicone sealant as effective on the PVC of the pipes as on the concrete of the looks.
The digging of the trenches allowing the evacuation of the separate rainwater network obeys the same standards as those of electricity or other networks: a minimum depth of 60 cm and 1 m under the passages of vehicles, pipes laid on a sand bed and covered in the same way with a warning wire of blue color (red for electricity and yellow for gas) and backfill (without large pebbles). A slope of 3 cm per meter is the most appropriate for this type of evacuation.
The sump, also known as a filter well or infiltration well, is a drainage system that can only be used for the evacuation of only rainwater, excluding any effluent, and where no network exists. public evacuation. It involves digging a vertical hole of 2 m in height and diameter in which is placed in the center and standing, a perforated nozzle (1.80 m in height and 1 m in diameter), then we hold the walls with breeze blocks and fill the space left between the nozzle and the blocks with machefer, coke or limestone. Large gravel and sand line the bottom of the nozzle. The rainwater arrives in the central part of the well and through the orifices, is filtered through the machefer. A slab provided with ventilation holes closes the sump.
Having the price of drinking water as an ally, the recovery of rainwater is in fashion. Better, it became a citizen gesture. Ingenious systems allow direct recovery from gutter descents. Then just have a tray to store it and can resume it in watering can or using a pump.
The rainwater collection tanks have become less cumbersome and seek to merge into the landscape by shapes and colors. But their capacity remains limited. The real effective solution comes from the buried plastic tank but obviously requires an earth moving for its installation and at least a lifting pump as for the water of a well.
One can also as with the well water, organize a real network with various points of water and distribution pipes to feed them continuously. In the same way, it is possible to build a buried irrigation network. On the other hand, in the name of the sacrosanct precautionary principle, its domestic use is reserved for the WC only. And as any rainwater is considered not drinkable even if analyzes proved the opposite (unlike well water), it is not close to being usable on the sink or in the bathroom.
If we can not, as in well water, recognize rainwater composition stability (too subject to the conditions of recovery), it is obviously ameliorable by individual systems of mineral and bacteriological filtration. But that's not enough to make it officially drinkable. The ideal remains to have a rainwater manager that includes a pump and a tilting system on the water network when the tank is empty.
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