Polyethylene tank Paladisp

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Specifications
Dispersing tank for hydraulic stability purposes that allows for the accumulation and gradual discharge over time of rainwater collected from impervious surfaces or urban drainage networks. It is composed of composite spiral pipes made of polyethylene reinforced with galvanized steel, compliant with UNI 11434. It is suitable for installation beneath driveways and within horizontal layers of permeable soil, separated from the tank walls by a layer of inert fill that serves as a backfill and transition element. It is complete with inlet and inspection ports made of smooth polyethylene. The spiral dispersing surface is created using 10mm holes or 8x40mm slots. Extensions can be installed on the inspection ports of all optional structures.

Objective
The objective of hydraulic invariance is to maintain the flow rate and volume of rainwater discharged into receiving bodies and to maintain the hydraulic balance of the area, even after rezoning and urbanization of the land.

Use
In order to achieve hydraulic invariance—the principle that changing the intended use of an area should not alter the flow rates that previously naturally infiltrated into the subsoil—the practice of artificially dispersing part of the rainwater flow through infiltration is becoming increasingly widespread. With this in mind, the creation of flow retention volumes within the sewer network that are capable of infiltrating excess rainwater into the aquifer is achieved by perforated Paladex® elements placed in a gravel bed that convey only the volumes that the network can absorb. A filter can also be placed on the installation base to remove solid particles that could reduce the soil's absorption capacity over time before being released into the groundwater. The advantage of using Paladex® technology is that these infiltration basins can be built directly beneath impermeable and drivable surfaces. The infiltration pipe is constructed using tubular elements made of polyethylene and galvanized steel, ranging in diameter from 300 to 2400 mm, with holes or slots drilled along the walls, spaced 10 to 20 cm apart and 5 to 10 mm wide. The infiltration pipe must have a slope of between 0.2% and 0.5%. The pipe will be laid in the center of a trench with a medium-sized gravel bed. Large-sized inert material will be placed along the sides to allow adequate ventilation and prevent the cracks from clogging.

Additional Technical Description
A dispersing tank for hydraulic stability purposes that allows for the accumulation and gradual discharge over time of rainwater collected from impervious surfaces or urban drainage networks. It is composed of sections of spiral-shaped slotted polyethylene pipes reinforced with galvanized steel, compliant with UNI 11434. It is suitable for burial beneath driveways and within horizontal layers of permeable soil, separated from the tank walls by a layer of inert fill that serves as a backfill and transition element. It is complete with smooth polyethylene inlet pipes and smooth polyethylene inspection ports. The spiral-shaped dispersing surface is composed of 8 mm holes or 8 x 40 mm slots. Extensions can be installed on the inspection ports of all structures (optional).

Advantages
Quick installation due to its lightweight construction and the ability to backfill using excavation waste. Excellent value for money. Their flexibility ensures the drainage pipes are highly resistant to soil pressure, even in the event of landslides.

The many advantages can be summarized as follows:
Installing the PALADISP system and backfilling it with soil up to ground level takes one day.
The modular system requires more time as it can only be assembled if the surface is perfectly level.
A lean concrete layer must be created at the bottom of the excavation, on which the geotextile layer and waterproof membrane will then be laid.
Assembling the modules and waterproofing the system will take several days. Only then can the tank be backfilled.

Environmental benefits:
They significantly reduce the risk of flooding in the event of intense rainfall events.
They allow controlled, low-volume release of rainwater into existing sewers or waterways.
They recharge local groundwater (when used through infiltration/absorption).
They purify aerobically (presence of oxygen).