RAINBOX® Core Crates/Base Plate
The RAINBOX® Core system is designed for underground soakaway and attenuation applications for surface and storm water management. It can be used in landscaped or trafficked areas with a Gross Vehicle Weight of up to 40 tons, subject to project-specific design checks.
The system is made up of base plates, crates and side faces in a configuration to suit the project. Up to 13 layers can be installed per base plate, with installation depths of up to 4.75 metres depending on application, loading and ground conditions.
Features & benefits include:
- Suitable for soakaway infiltration and storage attenuation systems
- Designed for landscaped and trafficked areas, subject to design
- High storage volume with up to 96% void ratio
- Each crate has a gross volume of 224 litres and a storage volume of 215 litres
- Crates fit together simply and can be installed without heavy machinery
- Straight connection to 100mm, 150mm, 200mm, 225mm and 250mm (ID) ULTRA3 pipework
- Alternative EN1401-1 / EN 13476-2 pipework connection possible
- Adaptors for twinwall and other pipe types are available from JDP
- Service life of over 50 years
- BBA approved, certificate 15/5200
Please Note: Minimum and maximum loading depths vary by application and ground conditions. A structural design check should be performed in line with CIRIA C680 before installation. All images shown are used for illustration purposes only and may differ from the actual product supplied.
Product Details
RAINBOX® Core systems act as underground reservoirs to collect water through drainage systems during storms and persistent rainfall. In developed areas, this helps manage surface water where permeable ground has been reduced.
The system is comprised of base plates, crates and side faces, with the number and configuration dependent on the project. Up to 13 layers can be installed per base plate, subject to design, application and ground conditions.
Applications
Attenuation system: In an attenuation scheme, water is stored within the system and, with flow controls, is slowly released back into a watercourse or sewer system.
Soakaway system: In soakaway schemes, the system is wrapped with a permeable membrane. Water is collected and slowly soaks back into the ground through infiltration.
Compatibility
The system allows straight connection to 100mm, 150mm, 200mm, 225mm and 250mm (ID) ULTRA3 pipework, or alternative EN1401-1 / EN 13476-2 pipework. Adaptors for twinwall and other pipe types are available from JDP.
Technical Design
Minimum and maximum loading depths vary by application and ground conditions. A structural design check of the system should be performed in line with CIRIA C680 before installation, provided free of charge from JDP Technical Support.
The supplied loading information is offered for reference only.
Maximum Depth of Installation
Over consolidated stiff clay: Soil weight 20kN/m2, angle of internal friction 24 degrees. Maximum depth is 3.25m for landscaped areas, 3.00m for vehicle weight <9 tonnes, 2.75m for vehicle weight <30 tonnes and 2.50m for vehicle weight <40 tonnes.
Silty sand clay: Soil weight 19kN/m2, angle of internal friction 26 degrees. Maximum depth is 3.75m for landscaped areas, 3.50m for vehicle weight <9 tonnes, 3.25m for vehicle weight <30 tonnes and 3.25m for vehicle weight <40 tonnes.
Loose sand and gravel: Soil weight 18kN/m2, angle of internal friction 30 degrees. Maximum depth is 4.50m for landscaped areas, 4.25m for vehicle weight <9 tonnes, 4.00m for vehicle weight <30 tonnes and 4.00m for vehicle weight <40 tonnes.
Medium dense sand and gravel: Soil weight 19kN/m2, angle of internal friction 34 degrees. Maximum depth is 5.00m for landscaped areas, 4.75m for vehicle weight <9 tonnes, 4.50m for vehicle weight <30 tonnes and 4.50m for vehicle weight <40 tonnes.
Dense sand and gravel: Soil weight 20kN/m2, angle of internal friction 38 degrees. Maximum depth is 5.00m for landscaped areas, 5.00m for vehicle weight <9 tonnes, 4.75m for vehicle weight <30 tonnes and 4.75m for vehicle weight <40 tonnes.
Minimum & Maximum Cover Depths
- Landscaped area: Minimum cover depth 0.30m, maximum cover depth 2.75m
- Vehicle weight <3 tonnes: Minimum cover depth 0.50m, maximum cover depth 2.75m
- Vehicle weight <9 tonnes: Minimum cover depth 0.60m, maximum cover depth 2.75m
- Vehicle weight <12 tonnes: Minimum cover depth 0.70m, maximum cover depth 2.75m
- Vehicle weight <30 tonnes: Minimum cover depth 0.75m, maximum cover depth 2.50m
- Vehicle weight <60 tonnes: Minimum cover depth 0.90m, maximum cover depth 2.25m
Important Information
The design is sensitive to small changes in the assumed value of φ, so these values should be confirmed by a chartered geotechnical engineer. In clay soils, it may be possible to utilise cohesion in some cases.
The supplied assumptions state that the ground above and to the sides of the tank is horizontal, and that shear planes or other weaknesses are not present within the structure of the surrounding soil.
JDP offers free consultation and drainage system designs for foul and surface water drainage management systems. Contact JDP to discuss your requirements.
Product Guide 
