Neptune 500 Attenuation Crate

The Neptune XL Attenuation Crate is a modular, high-strength stormwater attenuation system designed for use in SuDS-complaint drainage schemes. Its XL format enables rapid installation while maintaining excellent structural performance, suitable for both trafficked and non-trafficked area.

Dimensions	1.0m x 1.0m x 0.5m (2 unite per m2)
Storage Volume	500 litres (475 litres actual storage @ 95% void ratio)
Unit Weight	25.4 kg per unit
Void Ratio	95%
Compressive Strength	450 kN/m2 (Vertical) / 95 kN/m2 (Lateral)
Maximum Installation Depth	4.5 m (AOF 38°)

DRAWINGS

Why Choose Neptune Crates?

95% void ratio for superior storage efficiency
Engineered for HGV loading with appropriate installation depths
Modular design for flexible layouts and ease of installation
Manufactured from high-strength, long-life materials
Suitable for attenuation, soakaway, and retention applications
Fully compatible with SuDS guidelines and planning requirements
Ideal for domestic, commercial, and civil engineering projects

How Neptune Crates Work

1.

Rainwater enters the system from roofs, hard surfaces, or infiltration points.

2.

Water is stored within the high-void matrix of Neptune Crates.

3.

Release or infiltration:
– In attenuation systems, water is released slowly through a flow-control device.
– In soakaway systems, water infiltrates naturally into the surrounding soil.

4.

Flooding is prevented, network loads are reduced, and site drainage performance improves.

Frequently Asked Questions

What makes Neptune Crates different from standard attenuation crates?

Neptune Crates offer a 95% void ratio, giving greater storage capacity with less excavation. They are also engineered to withstand HGV loading, making them suitable for both light domestic use and heavy commercial applications.

Are Neptune Crates SuDS compliant?

Yes. Neptune Crates support infiltration, attenuation, and retention system types, all in line with SuDS best practice and current drainage regulations.

Can Neptune Crates be installed beneath driveways or roads?

Absolutely. When installed with the correct cover depth and backfill type, Neptune Crates are fully suitable for trafficked areas, including HGV-rated environments.

Do I need an infiltration test before installing a soakway system?

Yes. A percolation or soakage test should be carried out to ensure the ground is suitable for infiltration. If not, an attenuation system may be recommended.

How long do Neptune Crates last?

Manufactured from durable, high-strength polymer materials, Neptune Crates offer long service life with excellent resistance to environmental and structural stresses.

Company No. 11750319 | VAT Reg. 313255143