Where can DRENING be installed?

Drening can be installed below any surface: from green areas to heavy traffic zones, provided it is set up with the correct stratigraphy. Installation below buildings is not recommended.

Why use DRENING if I can drain the water into the sewer system?

The authorities in many areas set the maximum flow rate of water that can be released into the sewer system and these limits are usually very restrictive. A properly sized DRENING basin permits the disposal of water in accordance with the provisions, preventing sewer obstruction and surface flooding. By infiltrating the water into the subsoil, the natural hydrological balance is restored, contributing to the preservation of groundwater.

Is DRENING available in different heights?

No, because the product was designed to form the correct balance between the depth of the water and the available surface.

Can the elements be superimposed, creating a multilayer system?

It is possible to create a double-layer system to reduce the surface but only below the areas not subject to heavy traffic. In this case, the upper part of the basin must be separated from the lower by at least 20 cm of gravel and must be rotated at a 90° angle.

May I use DRENING if the soil does not allow water to seep through?

Drening basins can be installed even in areas with low permeability. In this case, the system must be oversized based on the residence time of the water in the ground, provided with an overflow that discharges collected water into the drainage or a canal at a controlled rate. In the latter case, the system acts as a millwork basin and prevents the flooding of the surfaces.

Does the system allow the treatment of accumulated rainwater?

The draining basin is a system that allows the dispersion of water but it does not change its quality. If, however it is combined with an appropriate water pre-treatment (de-oiler, grit separator…) placed upstream of the system, able to receive run-off water from parking lots and potentially contaminated areas, it is a winning solution for proper flow management from both quantitative and quality point of view.

Can the basin supply pipes be inserted into the upper part of the elements?

If necessary, the supply pipes can be inserted into the upper part of the elements. However, it’s recommendable to insert the pipes frontally, into the closing cap.

Can the system be inspected in order to verify its integrity?

Drening is inspectional only if you use inspection pits, which are also useful for cleaning it with a water jet. The pits have to be placed outside of the basin. The inspection can be carried out with a camera or a probe, as is the case with the cleaning of sewer pipes.

Should the supply pipes be placed in each row?

This choice is left to the designer. Generally, it is sufficient to place them in alternate rows. You should consider that the water is distributed laterally through the holes on both sides of the chambers.

Does the application of air pipes in the dugouts for wastewater treatment create a bad smell?

No, it doesn’t for two main reasons. First, because the air tends to move from the outside to the inside of the system. This motion is favored by the temperature differences between the two environments (usually the internal temperature is higher than the external). Secondly, the air facilitates the self-purification of wastewater by means of microorganisms present in it. This process takes place even in the absence of air but works slower and produces more smelling compounds. Therefore, it is better to facilitate the penetration of air into the system to avoid the diffusion of odors.

Does the system last over time?

Yes, it does. The element is made of HD PE that is resistant to chemical agents and microorganisms, so the system integrity is guaranteed.

Should the elements be wrapped in geotextile?

No, they don’t, geotextile should be placed on top of the gravel layer, over the chambers, and on the sides of the excavation, to prevent gravel obstruction.

Does the system require frequent maintenance?

No, it does not, but periodic cleaning with a water jet is recommended. In this case, it is appropriate to provide a pit for the entry of the cleaning system and lay the geotextile or a reinforcement net over the gravel close to the well, to prevent the displacement of the draining material by the water jet pressure.

Is it possible to cut the elements at the end of the rows if there is a lack of space?

No, because it would no longer be possible to attach the closing cap, which is necessary for a correct installation. In cases like these, the modularity of the product should be taken into account because it permits the creation of basins of various sizes and shapes.

Is the realization of the system possible where there are sub-services?

It is recommendable to place the draining basin in an area where there are no sub-services. In the case of new urbanization, the sub-services should also pass outside the system.

Is it possible to plant vegetation over DRENING?

It is better to avoid the planting of trees over the basin. It is possible to plant low-rooted shrubs, providing an appropriate thickness of soil over the system.

If the product is installed under a green area, is the water that seeps from the ground above sufficient to supply the system?

It is always recommended to consider additional supply, especially if the product was installed to collect and reuse the water. It can collect the rainwater from a building, or from adjacent paved surfaces.