Carparks, multi-story and underground parking facilities are an essential component of any cities infrastructure. These types of areas are heavily trafficked everyday by vehicles – residential and commercial, as well as pedestrians.
Specified drainage solutions should consider frequency of traffic, types of vehicles as well as pedestrian safety.
Drainage Solutions for Carparks
There are a range of requirements for channel drainage within parking areas. Heavy traffic with high loads, dynamic forces, corrosive substances and depth restrictions are some factors that should be considered for drainage systems.
Factors Influencing Drainage Specification
Loads and Forces
Vehicles exert significant loads, dynamic forces and stress on surfaces whilst braking, turning, reversing and accelerating. Carpark drainage must be able to withstand a variety of loads and forces.
Pedestrian Safety
Systems with features such as lockdown, anti-slip or heel guard should be installed for added pedestrian safety.
Extensive Surfaces
For larger areas, it may be more cost effective to choose drainage solutions with a larger capacity. Precise hydraulic calculations will help determine correct channel sizing and systems for projects.
Theft and Vandalism
Drainage systems with lockdown connections or bolted grates will protect the system from vandalism or theft.

Surface Drainage Solutions for Underground Carparks
Surface water in underground parking areas can be from cars driving stormwater in, testing fire system, inadequate construction or poor ramp drainage.
Additional Considerations for Underground Parking
- Loads and ForcesAs vehicles manouveur the carpark; turning, accelerating or braking,this imposes significant loads, stress and force on the system below. Linear drainage across ramps are also subject to high impact loads.
- Corrosive EnvironmentParking surfaces and channel grates are subject to attack from corrosive substances such as oil, petrol or brake fluids. Therefore, the selected drainage solution must be corrosion resistant.
- Depth RestrictionsParticularly in multi-story carparks, there may be depth limitations for the installation of drainage.
- High Volume of Surface Water RunoffSteep inclines of entry and exit ramps can create a fast, high volume of run off surface water
Drainage Solutions for Carparks, Multi-Story and Underground
SABdrain has a wide range of drainage solutions for carparks, including smaller depth options.
356 - Polypropylene Channel and Grate
Polypropylene channel with Class C rated polypropylene grates. SABdrain 356 features a click-clack fixing system for quick and easy access.
- Sizes available
- (external : 150mm x 100mm)
- (external : 150mm x 150mm)
- (external : 150mm x 200mm)
704 - Polypropylene Channel and Cast Iron Grate
Polypropylene channel with Class D rated cast iron grates. Each grate is equipped with 8 point security fixing system to keep it rattle free from vehicular movements and secure it from unauthorised access.
- Sizes available
- (external : 150mm x 100mm)
- (external : 150mm x 150mm)
- (external : 150mm x 200mm)
- (external : 200mm x 150mm)
- (external : 200mm x 200mm)
- (external : 250mm x 100mm)
- (external : 250mm x 150mm)
- (external : 250mm x 200mm)
- (external : 250mm x 250mm)
- (external : 250mm x 300mm)
- (external : 250mm x 350mm)
- (external : 390mm x 260mm)
- (external : 390mm x 360mm)
High Capacity Slot Drainage System
High capacity slot drainage channel with syphonic action to assist with draining large volumes of water.
- Sizes available