5 things you need to consider when selecting surface water drains

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There are a range of product features and options to consider when designing surface water drainage systems.

Here are 5 key considerations you need to factor into your plans during the design process.

1. Install the app

The characteristics of drainage systems for commercial or residential applications can vary widely. Attributes such as grid interlocks, type/amount of traffic they will be subjected to, topography and type of area to be drained and installation process are some of the important considerations.

If the surface has a slope to a centralized point, a Storm series or a pit/sump would be an excellent choice. If the surface has a slope in one direction, a channel such as Polymer Concrete (PC) from Allproof would be appropriate.

Other systems interacting with or adjacent to the drain should also be given due consideration. For example, if the door/window joinery has an escape route below the sill, a traditional 3-sided channel installed as a level sill could block it. Allproof’s perimeter drain would be applicable here.

2. Hydraulic performance

The surface may dictate the type of strip drain – a narrow slot drain (15mm) would likely be hydraulically bridged if installed at the bottom of a steep slope. A larger channel such as a PC with cast iron grates would provide better pickup.

The open area of ​​the grate plays a key role in hydraulics – some gratings may have larger open areas but smaller individual openings. Smaller openings may be prone to blockage, but may be required for other features. Maintenance schedules should be considered if this is an issue.

3. Performance Features

Pedestrian and vehicular traffic should be considered, and load classes (AS3996) should be referenced to ensure the drains will be suitable for this type of traffic. For pedestrian traffic, other characteristics such as anti-heel grid openings (less than 8 mm) and slip resistance (AS4586) must also be taken into account.

4. Environment

When selecting materials, it is important to consider the life of the product in a specific environment, as drainage products are exposed to large amounts of moisture due to the nature of their application. Materials such as cast iron react naturally to the environment; it is also aesthetically pleasing and does not affect performance. In high traffic applications, oxidation will stabilize more quickly, leaving a natural dull dark brown patina. A glass-filled nylon or polypropylene grille will retain its black finish.

In marine applications Allproof recommends 316 grade stainless steel and for added protection electropolishing is an option.

5. Sustainability

Was the selected system manufactured with durability in mind? Allproof’s domestic and commercial plastic pits and gutters are made from 100% recycled materials. Additionally, Allproof’s main production facility is powered by solar panels. Allproof firmly believes that the process is as important as the product.

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