Sewage Works

Golden Shade Group operates the sewerage infrastructure and assets for several projects.

Sewage is the spent or used water from a community. It comes from domestic, commercial and industrial sources. The collection, treatment and disposal of sewage is an integral part of the water cycle that maintains the balance of water in nature. Sewage is 99.97% water because by far the greatest volume comes from showers, baths and washing machines. The rest is dissolved and suspended matter. Sewage also comes from industrial processes.

Sewage is disposed of in a sewerage system or network. This is the network of pipes that takes sewage away from households and businesses. The network carries the sewage to a treatment plant where it is treated, so that it can be safely recycled back to nature. Most sewerage systems are made up of service branch lines from individual homes, which feed into reticulation mains. The mains feed into pump stations and trunk sewers, which then lead to treatment plants. Sewage is mostly water and generally contains less than 0.05 per cent solids (or 1 part solid for every 2,000 parts water). Most sewerage systems are designed to use gravity. Sewage will flow through most sewers without assistance if the pipes have been designed with enough downhill slope. Where pipes cannot slope in this way, sewage pumps are used to push the sewage through the pipes. Most sewage pump stations contain a large well where the sewage collects until it is high enough to start the pump automatically. The pump stops when most of this sewage is pumped away.


Manholes are placed at regular intervals along the main sewerage pipes and where there is a high risk of blockages. This could be at a point where the pipe changes direction, slope, size or level. These manholes allow work crews to access the system to fix any problems. There is usually a sewer manhole every 50 to 150 metres along a main pipe.

Trunk sewers

Trunk sewers carry sewage from the main pipes and pump stations to the sewage treatment plant. These are huge sewer pipes that are generally more than 300 millimetres (30 centimetres) in diameter, and can be more than two metres across. These trunk sewers can be tunnelled through hills, and bridged over creeks.

When moving water over long distances, the use of pipes could be the best or the only (in case of heights to overcome) solution. Moreover, in urban contexts aqueducts and wastewater pipes are often buried and run under roads. To install underground pipeline, causing the minimum damage to existing infrastructures (consider simply a road interruption), the excavation and backfilling operation should be as fast and precise as possible.

Golden Shade offers both fast and efficient solutions for long run pipelines and smart and "clean" solutions for all types of piping networks.