FAQ - Frequently asked Questions about Stormwater Management Systems

The QuadroControl ST-B system shaft is designed to seamlessly integrate into modular block structures measuring 0.80 meters in both length and width. It serves multiple functions, including as an inspection shaft or ventilation point within the system, particularly effective when fitted with shaft covers that include ventilation openings.

The assembly features half elements that are straightforward to install on-site. Depending on the configuration, a cone is used for a full block shaft setup, while a roof slab is employed for a half block shaft configuration. Additionally, a sidewall grid is included as needed, based on its placement within either a storage or infiltration module.

Rigofill ST modules are efficiently delivered stacked on pallets measuring 1.60 meters by 0.80 meters. Each pallet contains 68 half elements, sufficient for assembling 34 modules. Typically, the factory stacks two pallets on top of each other for shipment.

Additionally, sidewall grids and supporting grids, along with roof slabs (required only for half blocks), are separately packaged on individual pallets. This packaging ensures organized and systematic delivery of components for assembly on-site.

EN 17152-1 introduces the first-ever product standard for storage and infiltration modules across Europe, marking a milestone in November 2019. It was accompanied by test standards for both short-term compressive strength (EN 17150) and long-term compressive strength (EN 17151).

This development is significant as it establishes a standardized European test methodology, allowing for the assessment and comparison of long-term compressive strength for the first time.

Over time, this standard is anticipated to gradually replace national approvals or serve as the foundational framework for test requirements in obtaining approvals across European jurisdictions.

Rigofill storage and infiltration systems offer exceptional design flexibility, characterized by minimal constraints on length and width. The square 800 mm block layout enables seamless adaptation to virtually any configuration. With block heights of 660 mm for full blocks and 350 mm for half blocks, these systems can be constructed in various sizes to accommodate both single-layer and multiple-layer configurations.

This adaptability allows for tailoring the system to meet specific on-site requirements. In areas with high groundwater levels or low permeability soil, shallow-depth systems are preferred for effective water management.

Conversely, in soils with good permeability, taller and denser systems offer advantages and can be constructed accordingly to maximize space utilization.

Overall, Rigofill systems optimize design flexibility to suit diverse soil conditions and project needs, ensuring efficient stormwater management and utilization of available space.

CCTV inspection using state-of-the-art technology is the most effective method for assessing the condition of Rigofill ST modules. This approach enables thorough examination for final acceptance or subsequent evaluations, ensuring confidence and safety for authorities, engineers, construction firms, customers, and operators.

Rigofill ST modules are designed with a cross-shaped tunnel configuration, which enhances camera accessibility and allows for thorough inspection and maintenance in four dimensions. This design feature facilitates comprehensive examination and ensures the system’s operational integrity over time.

An underground floodway functions by directing excess flood or stormwater from the surface into subterranean tunnel facilities. These flood tunnels are built in stages and are typically located in urban areas where conventional river channelization is not feasible due to existing infrastructure constraints.

Attenuation systems function as a simple method for storing excess water, collecting water from multiple inlets such as pipes and channel drains, typically with a single outlet. Acting as a reservoir, the tank allows water to accumulate, preventing downstream drains from becoming overloaded during intense storms. The outlet often includes a flow control device, such as an orifice plate or vortex flow control, to manage the rate of water discharge. Tank size is determined by factors such as rainfall intensity, surface area, and considerations for climate variability.

Well-designed tanks should consistently manage the site’s water volume effectively, ensuring reliable performance under varying weather conditions.