Stormwater Infiltration Cistern
ABS Plus Void Formworks can also be used to construct underground stormwater infiltration cisterns. Instead of a traditional raft foundation, these cisterns are built on a crushed stone or gravel bed that allows stormwater to infiltrate naturally into the soil.

Stormwater Infiltration Cistern - Render
ABS Plus Void Formworks can also be used to construct underground stormwater infiltration cisterns. Instead of a traditional raft foundation, these cisterns are built on a crushed stone or gravel bed that allows stormwater to infiltrate naturally into the soil. On top of this permeable foundation, the ABS Plus system with Wide Bases creates a stable platform, distributing loads effectively and enabling the construction of large underground voids dedicated to stormwater storage and gradual infiltration.

Stormwater Infiltration Cistern - Render
The surrounding perimeter is formed by standard load-bearing walls, while the top slab is constructed with the ABS Plus system. This reinforced concrete cover withstands both soil pressure and additional loads—such as heavy vehicle traffic—making it suitable for installation beneath parking lots, roads, and landscaped areas.
To make such large underground infiltration cisterns possible, ABS Plus employs a Wide Base with a 350 mm diameter. This innovation increases the ground contact area from 1.3% to 9.6%—providing nearly seven times more support than the standard 125 mm base. The result is a far more stable system that ensures safe load transfer, minimizes the risk of ground settlement, and prevents structural damage. Without the Wide Base, constructing a concrete structure of this scale on natural soil would not be feasible.

Stormwater Detention Cistern - as Seen From Inside