- Necessary material
- Cheap equipment
- Two solutions to divert water
- Installing the tank
- Derivation of the descent
- An alternative: the beaker
Storing rainwater saves money, especially when you have a vegetable garden and a garden to maintain. Simply install a surface tank and connect it to a gutter chute.
Necessary materialDifficulty: 1/4
Cost: less than 100 €
Time: half a day
Equipment: meter, spirit level, ruler, hacksaw or fine-toothed hand saw, hoe, screwdriver...
- tank 1 m3 with frame,
- elbows and PVC tube,
- connector with male end (garden hose),
- hose clamp
Rainwater can be used for many purposes: watering the lawn, planting, washing the car, the terrace... All that is needed is a tank with a capacity adapted to its needs, which is connected to a gutter descent.
Of agricultural origin, the tank installed here offers a capacity of 1 m3. It has the advantage of being solid and not expensive: from 90 to 120 € new. This is definitely the best volume / cost ratio for such a project.
At everyone's reach, simply deflect the gutter down and install the tank nearby.
Reduced to the essential, the installation must however be drained before the winter to avoid the damage due to frost.
Two solutions to divert water
Sectioned at about 1.70 m from the ground, the descent is equipped with a 90° elbow which is extended by a tube section leading to the filling orifice of the tank.
To prevent the tank from overflowing once full, we can decide to keep the bottom of the descent and instead of the elbow, add a collector. This device PVC or zinc has a swivel spout which, in the open position, deflects the waters of the descent to the tank and, by closing it with a gesture, restores the normal evacuation of rainwater along the descent. As a precaution, once the installation is done, it is best to protect the tank from light with canes or briar for example. This to limit the development of molds and other microorganisms while concealing the tank.
Installing the tank
- Flatten the ground to provide a good foundation for the blocks.
- If you want to avoid weed growth, cover the soil with a geotextile felt.
- Check the horizontality of the blocks diagonally with a spirit level on a ruler or cleat.
- If necessary, dig a little under the highest part.
- Add the following blocks, then lay a pallet.
- Finally place the recuperator on this one.
- Correct the horizontality if necessary using wedges under the pallet.
- Remove the last section of the downspout, if it is nested.
- If not, or if the height is not enough, cut the descent higher with the handsaw.
Derivation of the descent
- Measure the length of the connection to be made from a 90° elbow (added at the bottom of the sectioned descent) to the tank fill hole.
- Postpone the measurement on a PVC tube with the same diameter as the descent.
- Then cut the tube with a hacksaw or with a handsaw with fine teeth.
- Insert the connection tube into the bend of the descent and equip it with an identical elbow at the other end.
- Check that it dips sufficiently into the tank.
- Then glue them with a PVC glue.
- Screw a male fitting onto the drain valve of the recuperator.
- Insert the garden hose and tighten the screw clamp.
An alternative: the beaker
There are manifolds equipped with a spout (PVC, zinc...) that fits between two sections of a rainwater run. To fill the tank, simply switch the spout that folds once the collector full. Different diameters are available. This process also exists with a tap.