Disconnect kits for residential developments: on-site stormwater management (SuDS)
Standardised kits to disconnect drain pipes from the sewer and manage rainwater on-site in line with SuDS principles.
Developed to meet the practical needs of volume housebuilding, prefab housing providers, renovation projects and homeowner associations.
Easy to scale modular infiltration units.
Accessible inspection and low maintenance.
Disconnects the drainpipe from the sewer.
Disconnecting stormwater as a requirement in new-build projects
Residential developments are increasingly affected by short, intense rainfall events and temporary surface water flooding. This increases pressure on sewer networks and raises the risk of damage and disruption in public space and on private plots.
As a result, local authorities increasingly require stormwater to be managed locally, with rainwater stored on site and released at a controlled rate, or infiltrated into the ground. How these obligations are implemented varies by municipality, but in practice they are often set out in local planning rules, for example through local stormwater regulations.
Why this matters for developers and housing providers
Permitting and compliance: local requirements can form part of planning conditions or project design criteria.
Risk management: reduced risk of surface water issues and less pressure on public infrastructure, particularly during intense rainfall.
Standardisation by house type: using a consistent solution per house type simplifies design, delivery and handover into long-term management.
From policy requirement, to an easy executable solution per home
Local stormwater requirements call for a solution that can be standardised: repeatable per house type, easy to integrate on the plot, and straightforward in both installation and ongoing management. In volume delivery, you want to avoid on-site storage becoming a bespoke design exercise for every plot.
Stormwater management on-site, without a complex design process
Municipal requirements and ambitions around stormwater management vary. Residential schemes need practical solutions that fit programme and site delivery. Hydrorock disconnect kits were developed as a standardised, per-home approach.
Quick selection and sizing: based on roof area, required storage capacity and available plot space
Simple underground integration: garden, driveway, or for new build, below the home
Low-maintenance management via an accessible inspection point (inspection chamber)
Environmentally conscious approach, designed for underground use with a focus on durable, long-term asset management
Hydrorock disconnection kit
Plug-and-play per home
Standardised kit per roof area. Supplied as a complete set including stormdrain filter and connection materials.
Fast installation
Smallest configuration: around 2 hours with 2 people. Minimal groundwork necessary.
Fits most plots
Underground installation in the garden, under the driveway, or in new build projects, below the home.
Predictable planning and delivery
Supplied ready to install on 1 or 2 pallets, suitable for just-in-time and phased deliveries on tight build programmes.
Low-maintenance
Access via stormdrain cover for easy inspection and maintenance.
Circular material, long service life
Made from recycled stone wool, designed for long-term performance with easy inspection and maintenance.
Five kit sizes, matched to roof area and required storage
There are five disconnect kits, A to E, with increasing buffer capacity. This provides a suitable solution for homes with approximately 50 to 100 m² of roof area to be disconnected and storage requirements up to 70 mm, depending on the situation and soil type.
What’s included in a Hydrorock disconnect kit?
Each kit is supplied as a complete system, for homes from 50 m² up to 100 m² roof area*.
A Hydrorock disconnect kit consists of Hydrorock blocks, an inspectable stormdrain filter and all connection materials. The kit easily connects to the home’s drainpipe.
* Roof area figures are indicative. Final sizing depends on soil permeability (k-value), local storage/attenuation requirements and required drawdown time. Contact Hydrorock for project-specific advice.
Stormdrain cover in three options
Only the cover of the stormdrain filter is visible at finished ground level. The filter unit is available with a plastic cover, or with a stainless steel or graphite steel grille cover.
Installation locations: back garden, front garden, under the driveway, or below the home
The disconnect kits are installed underground. In practice, projects often choose installation in the back garden, front garden or under the driveway. For new build, installation below the home between foundation beams may also be possible.
Hydrorock disconnect kit under trafficked areas (e.g. driveway)
TTypical cross-section of a Hydrorock disconnect kit installed below a trafficked surface, designed to accommodate vehicle loads.
Hydrorock disconnect kit under non-trafficked areas (e.g. patio or lawn)
Typical cross-section of a Hydrorock disconnect kit installed below a non-trafficked surface such as a terrace or lawn.
Hydrorock disconnect kit installed below the home (New build)
Typical cross-section of a Hydrorock disconnect kit positioned below the dwelling, for example between foundation beams.
Hydrorock disconnection kit installation
A straightforward on-site installation method, using standard groundworks and a single underground assembly.
Installation in 5 steps
- Excavate the trench
- Level the base
- Place the Hydrorock blocks
- Connect the inspection chamber
- Backfill and compact
Smallest configuration: around 2 hours with 2 people.
Need advice?
Designed for fast, repeatable plot-level stormwater disconnection across new-build developments
Property developers and housing providers
Meet stormwater disconnection requirements with a solution that simplifies installation and handover to an asset manager or resident.
Prefab housing providers
A ready-to-install stormwater management package that fits a tight build programme and per-home logistics.
Residential contractors and installers
Fast installation, all accessories supplied, predictable installation time and reduced risk of rework.
Municipalities and residents
An accessible way to disconnect homes and reduce loading on the sewer network.
Maintenance & servicing of your Hydrorock system
To support long-term performance, maintenance services are available for inspection, cleaning and servicing of Hydrorock systems. Preventive servicing helps maintain permeability, reduce blockage risk and keep assets performing reliably year after year.
Hydrorock infiltration buffers are designed for a service life of 50+ years. For projects in the Netherlands, we work with RRS for inspection, cleaning and maintenance support, from a one-off post-handover clean through to multi-year service contracts.
The Hydrorcok disconnect kit connects to the home’s drainpipe. Rainwater no longer flows to the sewer, but to the underground buffer. From that buffer, water is released gradually into the soil. This combines storage and infiltration in a compact per-plot solution.
Hydrorock disconnect kits are intended for individual homes within residential projects, both new build and major refurbishment, where roof drainage needs to be stored and managed locally on the plot. They are well suited to volume housebuilding because the approach can be standardised per house type.
Selection mainly depends on roof area and the required buffer capacity, aligned with local requirements and soil type. As a guideline, kit sizes cover homes with approximately 50 to 100 m² roof area. Contact us for advice based on your house types and location.
Yes. The disconnect kits are designed for underground use, including under a driveway or parking area. The build-up above the system should be matched to the specific situation, including construction depth, trafficking loads and access to the inspection chamber.
For new build, installation below the home may be possible, for example between foundation beams.
Sufficient space is needed for an underground trench or excavation and a logical location for the inspection chamber / sandtrap. The required dimensions depend on the selected kit size and plot integration. Thanks to the modular system, multiple layouts are possible. In practice, excavation is straightforward and can be planned within external works, particularly for volume delivery.
The system is low-maintenance. Periodic maintenance is mainly focused on the inspection chamber, for example visual checks and removing accumulated debris such as organic matter and leaves, to keep inflow performing properly. Frequency depends on the surroundings and the project’s asset management arrangements.
In less permeable soils, it is especially important to assess the required storage and the drawdown after rainfall events, so sufficient buffer capacity becomes available again. Contact us and we will review this based on location and project criteria.
With the following, we can advise quickly:
Project location (municipality) and project type (new build or refurbishment)
Number of homes and house types
Indicative roof area per home (and number of downpipes)
Available plot space and preferred location (front, rear, driveway, below home)
Known soil type and groundwater level (if available)
Any local storage requirement or project criteria (if known)
