Cupolex Rialto Stormwater Tanks


CUPOLEX-RIALTO® is a forming system for providing an easy, efficient and fast solution for constructing cast in place underground concrete stormwater storage tanks.

CUPOLEX® concrete tanks can be designed at various depths either as shallow or deep tanks. If deeper tanks are required for maximum volume or to minimise the footprint area, then the CUPOLEX-RIALTO forming system can be used to create stormwater tanks from 500mm (20inches) to 2000mm (79 inches) deep. This cutting edge forming system comprises of CUPOLEX® domes, pipes and bases manufactured using 100% recycled materials.

The CUPOLEX-RIALTO® elements quickly interlock and connect to each other composing a bearing structure ready for the placement of concrete, creating the most structurally sound underground stormwater tank on the market. This highly efficient method to manage stormwater supported by the matrix of columns formed by the pipes, allows for easy inspection/cleaning.

The CUPOLEX-RIALTO storm tank system can be designed to support any high load-bearing requirements, unlike any pipe, plastic vault, crate system, or time consuming, costly precast vault system on the market. This structurally advanced, cost effective stormwater management system was created to reduce the overall footprint, accommodate any site restraints, and lower overall costs. Whether you require a solution for detention, retention, water quality, water harvesting or water reuse, CUPOLEX® has a design to meet your specific needs.


  • High Load Bearing exceeding HS-20 loading.
  • Can be designed as watertight system.
  • Custom design and layout
  • Applications for pavements or green space
  • Streamlined installation supporting required work loads
  • Suitable in minimum or no cover applications
  • Cost-effective, quick and easy installations
  • No liners or geotextile fabric required
  • Maximum storage volume up to 98% void space
  • Shipped unassembled, saving costs for freight
  • Allows for inlet/outlet pipes and cleanout/observatory ports installed at any location of the tank
  • Saves space and money
  • Time tested technology with over 500 million sq.ft installed
  • Manufactured to ISO 9000:2002 high quality standards


  • Stormwater Detention
  • Stormwater Harvesting

Design & Engineering

We provide PE stamped shop drawings through our engineering partners globally, construction training, and installation observation.  We work closely with the design team, the contractor, and the owner to ensure the success of the project.  Each site is different, and working with project partners to find installation solutions that address specific site needs is a part of the service we provide.

To begin using the CUPOLEX® in your building of home development, visit our Getting Started page for a step-by-step road map on using this product.

Contact us today to GET STARTED on your CUPOLEX-RIALTO Stormwater system design.


Please refer to the Cupolex Rialto Technical Data Sheet for details of the physical properties of the product range. The appropriate height of Cupolex should be selected based upon the required equivalent void for the required water volume and the concrete thickness above the domes is based on the maximum load capacity that the slab is required to support. This information is provided in the table below:


Overall Form DepthPlan Dimension InstalledConcrete Consumption to top of DomesClear Void EquivalentWater VolumeData SheetCAD Block
cm (inch)cm (inch)m 3 /m 2 (cy./sq.ft.)cm (inch)m 3 /m 2 (cy./sq.ft.)
80 (30”)57x57 (23"x23")0.046 (0.0057)60 (24.0")0.60 (0.078)PDFDWG
85 (32”)57x57 (23"x23")0.048 (0.0060)65 (26.0")0.65 (0.085)PDFDWG
90 (34”)57x57 (23"x23")0.050 (0.0063)70 (28.0")0.70 (0.093)PDFDWG
95 (36”)57x57 (23"x23")0.052 (0.0066)75 (30.0")0.75 (0.102)PDFDWG
100 (38”)57x57 (23"x23")0.054 (0.0069)80 (32.0")0.80 (0.109)PDFDWG
105 (40”)57x57 (23"x23")0.056 (0.0072)85 (34.0")0.85 (0.117)PDFDWG
110 (42”)57x57 (23"x23")0.058 (0.0075)90 (36.0")0.90 (0.124)PDFDWG
115 (44”)57x57 (23"x23")0.060 (0.0078)95 (38.0")0.95 (0.131)PDFDWG
120 (46”)57x57 (23"x23")0.062 (0.0081)100 (40.0")1.00 (0.138)PDFDWG
125 (48”)57x57 (23"x23")0.064 (0.0084)105 (42.0")1.05 (0.145)PDFDWG
130 (50”)57x57 (23"x23")0.066 (0.0087)110 (44.0")1.10 (0.153)PDFDWG
135 (52”)57x57 (23"x23")0.068 (0.0090)115 (46.0")1.15 (0.162)PDFDWG
140 (54”)57x57 (23"x23")0.070 (0.0093)120 (48.0")1.20 (0.169)PDFDWG
145 (56”)57x57 (23"x23")0.072 (0.0096)125 (50.0")1.25 (0.176)PDFDWG
150 (58”)57x57 (23"x23")0.074 (0.010)130 (52.0")1.30 (0.184)PDFDWG
155 (60”)57x57 (23"x23")0.076 (0.0103)135 (54.0")1.35 (0.191)PDFDWG
160 (62”)57x57 (23"x23")0.078 (0.0106)140 (56.0")1.40 (0.200)PDFDWG
165 (64”)57x57 (23"x23")0.080 (0.0109)145 (58.0")1.45 (0.270)PDFDWG
170 (66”)57x57 (23"x23")0.082 (0.0112)150 (60.0")1.50 (0.278)PDFDWG
175 (68”)57x57 (23"x23")0.084 (0.0115)155 (62.0")1.55 (0.286)PDFDWG
180 (70”)57x57 (23"x23")0.086 (0.0118)160 (64.0")1.60 (0.294)PDFDWG
185 (72”)57x57 (23"x23")0.088 (0.0121)165 (66.0")1.65 (0.302)PDFDWG
190 (74")57x57 (23"x23")0.090 (0.0124)170 (68.0")1.70 (0.310)PDFDWG
195 (76”)57x57 (23"x23")0.092 (0.0127)175 (70.0")1.75 (0.318)PDFDWG
200 (78")57x57 (23"x23")0.094 (0.0130)180 (72.0")1.80 (0.326)PDFDWG
205 (80")57x57 (23"x23")0.096 (0.0134)185 (74.0")1.85 (0.333)PDFDWG



  • Cupolex-Rialto Details


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