Stormbloc® Optimum range for stormwater storage & infiltration
Flow control and flood protection

Stormbloc Optimum range

Download the brochure

Attenuate or infiltrate surface water and stormwater effectively even in challenging high-traffic urban environments.

The Stormbloc® Optimum range comprises two resilient geocellular storage systems that provide underground storage and infiltration of surface water runoff; Stormbloc® Extra and Stormbloc®, plus an inspection chamber, the Stormbloc® Inspect.


The lightweight materials, combined with robust design make them easy to transport, quick to install and extremely durable.  With an optimum-strength option for high-traffic areas and a lighter option for landscape and low-traffic areas, the Stormbloc® Optimum range provides a space-saving solution for many applications.

The Stormbloc® Optimum range is modular and easily customisable, giving engineers the freedom to configure storage for even the most challenging SuDS project.

Download our white paper:  Tips for trouble-free geocellular design

GET A QUOTE
Resources

The Stormbloc® Optimum range comprises two robust geocellular storage blocks; Stormbloc® and Stormbloc® Extra to provide underground storage or infiltration of surface water runoff as part of Sustainable Drainage Systems (SuDS).  The range also includes Stormbloc® Inspect; a chamber which provides easy access for inspection and maintenance.


Applications

•    New and retrofit Sustainable Drainage (SuDS) schemes.
•    Infiltration / soakaway schemes.
•    Attenuation schemes.
•    Highways and infrastructure projects.
•    To increase swale / pond capacity.
•    Car parks and Park & Ride schemes.
•    Housing Developments.
•    Schools and Public / Civil schemes.
•    Aquifer re-charge.
•    Storage for rainwater harvesting and re-use

Stormbloc®

A lighter, cost-effective option suitable for landscaped or lightly trafficked areas.  Access for inspection and maintenance can be included where required using Stormbloc® Inspect chambers and Stormbloc® Extra blocks.

Stormbloc® storage/infiltration block

Stormbloc® Extra

A high-strength option ideal for installation beneath heavily loaded areas such as roads, car parks and warehouse yards. Access for inspection and maintenance is via Stormbloc® Inspect chambers and the channels in the blocks allow access for CCTV and cleaning to ensure that the storage volume of the system isn’t reduced by the build up of silts.

Stormbloc® Extra

Stormbloc® Inspect

The Stormbloc® Inspect offers an unrivalled level of accessibility to any Stormbloc® Extra or Stormbloc® installation. This modular access chamber, sited within the tank, has identical dimensions to a Stormbloc® Extra module and so can be easily incorporated into the layout of the infiltration or storage system.

Stormbloc® Inspect chamber

The Stormbloc® Optimum range is only available in the UK and Ireland

 

Customise your storage

Length, width and depth of storage can be customised in order to meet even the most demanding of drainage environments.  Options for high- and low-traffic loading enables cost-effective storage designs.

Save space on site

Both Stormbloc® Extra and Stormbloc® stack into compact nests for transport and storage, saving up to 75% of valuable space. The nested units save time and cost during installation, enabling more storage volume to be lifted into excavations at any one time.

Lightweight with two strength options

For more flexible designs choose between the high-strength Stormbloc® Extra for deep or high-loaded installations and Stormbloc® for shallower installations with lighter loads such as landscaped or low-traffic areas.

Stormbloc®

  • Storage capacity (half block):     0.220 m3
  • Porosity:    96%
  • Length / width / height:    800 / 800 / 330 mm 
    • (note:  for bottom layer add 30 mm for base plate)
  • Constructed weight:  10 kg (1 element & 1 baseplate)
  • Material:    Polypropylene
  • Vertical ultimate compressive strength:    313 kN/m2
  • Horizontal ultimate compressive strength:    93 kN/m2
  • Application suitability:  
    • Landscaped areas, no traffic
    • Lighter loaded areas, such as landscaped or low traffic areas (cars ≤ 2.5t)
  • Maximum installation depth:    3 m
  • Cover depth:  
    • Landscaped area, no traffic:  0.5 m
    • Light traffic loading ≤ 2.5 t:     0.8 m

Stormbloc® Extra

  • Storage capacity
    • Full block:    0.405 m3
    • Half block:    0.221 m3
  • Porosity:    96%
  • Length / width / height:
    • Full block    800 / 800 / 660 mm
    • Half block:    800 / 800 / 360 mm 
  • Constructed weight:  
    • Full block:    18.6 kg 
    • Half block:    13.7 kg
  • Material:    Polypropylene
  • Vertical ultimate compressive strength:    
    • Full block:    420  kN/m2
    • Half block:     420 kN/m2
  • Horizontal ultimate compressive strength:    
    • Full block:    165 kN/m2
    • Half block:     225 kN/m2
  • Application suitability:  
    • Landscaped area, no traffic
    • Lighter loaded areas, such as landscaped or low traffic areas (cars ≤ 2.5t)
    • Roads & HGV loading yards with traffic loading ≤ 44 t
  • Maximum installation depth:    4 m
  • Cover depth:  
    • Landscaped area, no traffic:  0.4 m
    • Light traffic loading ≤ 2.5 t:     0.6 m
    • Roads & HGV loading yards with traffic loading ≤ 44 t:    0.8 m

 

 

  • Stormbloc® Extra installation configuration
  • Stormbloc® Extra stack
  • Stormbloc® Extra installation
  • Stormbloc® Extra installation
  • Stormbloc® Extra stacked crates during installation
  • Stormbloc® stormwater storage & infiltration block
  • Stormbloc® two high
  • Row of Stormbloc® with Stormbloc® Extra block for pipe connection in the centre
  • Stormbloc® tank with Stormbloc® Inspect and Stormbloc® Extra row for inspection & maintenance access
  • Stormbloc® blocks stacked to save space in transit and on site
Q

What is the difference between Stormbloc and Stormbloc Extra?

A

Stormbloc® and Stormbloc® Extra are both part of our extended range of geocellular storage / infiltration blocks, along with the Stormbloc® Inspect chamber. 


Stormbloc® Extra is a high-strength block which is strong enough to install beneath heavily loaded areas, such as roads and car parks or for installations upto 4 m in depth.  

Stormbloc® is a lighter system which is ideal for installation in a broad range of schemes, including lightly trafficked and landscaped areas.  

You can find a like-for-like comparison table in the Stormbloc® Optimum brochure.

Q

How deep can my storage tank be?

A

As a general rule, for a tank constructed with Stormbloc® the total excavation depth should not exceed 3 m.

Because of it's greater strength, for a tank constructed with Stormbloc® Extra the total excavation depth can be up to, but not exceed, 4 m.

Tank designs in excess of 3 m for Stormbloc® or 4 m for Stormbloc® Extra can often be achieved with a bespoke design from our design team. For further details, please call 01275 337937 or email stormwater@hydro-int.com

Q

How much water can be stored in a single Stormbloc® element?

A

Stormbloc®

Storage volume for a single element (800 mm x 800 mm x 300 mm) is 0.203 m3
Storage volume for the base plate (800 mm x 800 mm x 30 mm) is 0.017 m3

Stormbloc® Extra

Storage volume for a full block (800 x 800 x 660 mm) is 0.405 m3
Storage volume for a half block (800 x 800 x 360 mm) is 0.221 m3

Q

What is the minimum cover level for a Stormbloc installation?

A

The minimum cover level is dependent on the loading that the tank will be subject to and whether Stormbloc® or Stormbloc® Extra blocks are being used.

Stormbloc design parameters table
Stormbloc Extra design parameters table

For further details download the Stormbloc® Optimum brochure.

If you have any queries regarding cover levels, please contact the Hydro International team at stormwater@hydro-int.com

 

Q

What are the lateral loadings for the Stormbloc® blocks?

A

Stormbloc®

  • Vertical ultimate compressive strength of 313 kN/m²
  • Horizontal ultimate compressive strength of 93 kN/m²

Stormbloc® Extra

Full block

  • Vertical ultimate compressive strength of 420 kN/m²
  • Horizontal ultimate compressive strength of 165 kN/m²

Half block

  • Vertical ultimate compressive strength of 420 kN/m²
  • Horizontal ultimate compressive strength of 225 kN/m²

Q

What maintenance is needed?

A

Access for CCTV inspection, maintenance and cleaning are all possible for Stormbloc® and Stormbloc® Extra systems.  We would always recommend a scheduled maintenance routine that is completed at least once a year.

Hydro-Logic® Smart Maintenance technology, which allows remote monitoring to provide real-time insight into water levels and also be integrated into the tank. This will send automated alerts when the tank needs cleaning or if a blockage occurs.  Data captured by the Hydro-Logic® Flexi Logger and sensors enable you to forecast future maintenance requirements and develop cost-effective maintenance plans.

Q

How are the blocks delivered?

A

Stormbloc®

Stormbloc® elements are delivered stacked in compact nests on jumbo pallets with maximum dimensions of 1.6 m length x 0.8 m width and 1.5 m height.  Each pallet can hold a maximum of 26 Stormbloc® elements or 92 base plates.

Stormbloc® elements and base plates stacked on jumbo pallets

Stormbloc® Extra

The Stormbloc® Extra blocks are delivered stacked into compact nests on jumbo pallets with maximum dimensions of 1.6 m length x 0.8 m width x 1.5 m height.  
Each pallet can hold max. 34 x Stormbloc® Extra Elements. 

Stormbloc® Extra blocks stacked on a jumbo pallet

 

GET A QUOTE

Book a CPD presentation on Geocellular Storage

Get best practice tips for design and installation of geocellular storage systems.

Book a training presentation for you and your colleagues.

BOOK A CPD
Loading

Join our mailing list

We'll keep you updated about things like news articles, upcoming webinars and product developments.