HidroCrate
45T · 60T · Underground PP modules · 95% void ratio
The HidroCrate is an underground polypropylene crate for Sustainable Drainage Systems (SuDS). Measuring 1×0,5×0,5 m with a 95% void ratio, each crate stores 237,5 litres of water. The crates interlock to build underground basins of any size — for stormwater infiltration, retention or storage.
Both models share the same shape and dimensions — 1000 × 500 × 500 mm, 95% void ratio and 237.5 litres per unit. What changes is the strength: the 60T is sturdier and takes heavy traffic up to SLW 60.
- Vertical load:
- 45T / 450 kN/m²
- Maximum traffic
- SLW 30 (30 t)
- Weight per m³
- 38,4 kg
- Vertical load:
- 60T / 600 kN/m²
- Maximum traffic
- SLW 60 (60 t)
- Weight per m³
- 47,2 kg
What the HidroCrate is
The HidroCrate is an underground polypropylene module for Sustainable Urban Drainage Systems (SuDS). Measuring 1×0,5×0,5 metres with a void ratio of 95%, each module stores 237,5 litres of water. The modules slot together to create underground basins of any size, matched to the project's flow and volume.
Returns water to the ground naturally, reducing peak flow and recharging the water table.
Delays the flood peak, relieving the storm drainage network during heavy rainfall events.
Stores stormwater for later reuse in irrigating green spaces, washing and other uses.
45T or 60T — which to choose?
Both models have the same dimensions and the same volume per module (0,25 m³). The difference is structural strength, which determines the minimum cover depth and the type of traffic allowed.
| Property | HidroCrate 45T | HidroCrate 60T |
|---|---|---|
| Max. vertical load | 45T / 450 kN/m² | 60T / 600 kN/m² |
| Lateral loads | 10T / 100 kN/m² | 15T / 150 kN/m² |
| Max. traffic (DIN 1072) | SLW 30 (30 t) | SLW 60 (60 t) |
| Weight per m³ | 38,4 kg | 47,2 kg |
| Typical application | Urban and residential areas | Industrial zones and heavy traffic |
| Reference | HS-20 | HS-25 |
Both measure 1000 × 500 × 500 mm, with a net volume of 0,2375 m³, a void ratio of 95% and a service life of over 50 years. Cover for pedestrians: 300 to 3.000 mm. With vehicles, the minimum depends on the traffic class (500 to 700 mm) — the full table is in each model's datasheet.
Technical specifications
HidroCrate 45THS-20
HidroCrate 60THS-25
Further documentation
System components
HidroCrate on site
Two systems built with HidroCrate 45T modules. Each reference has the full gallery of the project.
Attenuation system — Polytechnic of Coimbra
SuDS sizing calls for hydrological analysis specific to the site.
Our technical team supports designers and contractors at every stage of the project — from preliminary sizing through to on-site assistance.