There are a range of product features and options to consider when designing a surface water drainage system. Here are five points to help product specifiers identify what needs to be considered when selecting the correct system for a project.
1. Install application
Drainage systems vary depending on the application – meeting specific requirements for residential and commercial settings such as the amount and type of traffic that the drain will be subjected to. This will influence decisions such as the use of grate lockdowns, which are reccomended in commercial applications.
If the surface has a fall towards a centralised point, Allproof's Storm Series or Pit/Sump would be a suitable choice. If the surface has a fall in one direction, a channel such as Allproof’s Polymer Concrete (PC) would be appropriate.
Other systems interacting with or adjoined to the drain also need consideration. For example, door or window joinery may have a drainage path under the sill. Allproof’s Perimeter Drain would be applicable here.
2. Hydraulic performance
The surrounding surface can dictate the type of strip drain that should be specified. A narrow slot drain (15 mm) would likely be hydraulically bridged if installed at the bottom of a steep slope. A wider channel such as a PC with cast iron grate would provide better catchment.
The grate's open area plays a key role in hydraulics, for example some grates may have large open areas but small individual openings. Smaller openings can be prone to blockage but might be required for other characteristics. Maintenance schedules should be considered if this is a concern.
3. Performance features
Pedestrian and vehicle traffic must be considered. Load class ratings (AS3996) should be referenced to ensure the drains will be suitable for the type of traffic. For pedestrian traffic, other features such as heelproof grate openings (less than 8 mm) and slip resistance (AS4586) should also be considered.
4. Environment
When selecting a drainage system, it is important to consider the lifespan of the product. Drainage products are exposed to large amounts of moisture by the nature of their application. Materials such as cast iron will weather, however this does not affect performance. In high-traffic applications, oxidisation will stabilise more quickly – resulting in a natural dark brown patina. A glass filled nylon or polypropylene grate will maintain its black finish.
For marine and coastal applications, Allproof recommends a 316 grade stainless steel finish. For additional protection, electropolishing is an option.
5. Sustainability
Allproof plastic pits, domestic and commercial channels are made from 100% recycled materials. Additionally, Allproof’s main production facility is powered by solar panels – ensuring a sustainable manufacturing process. Allproof firmly believes the process is as important as the product.
For more information please contact Allproof.
