Heavy rain always exposes a blocked or inefficient stormwater system. We can clear most blocked drains with a water jetter, but sometimes there is a bigger problem. Stormwater drainage is the system that takes the rain water from the roof and hard surfaces and disperses it to either the kerb and gutter, a pit to then be pumped to the kerb and gutter, to a holding tank to limit the flow into the kerb and gutter, into rainwater tanks for recycling, or into absorption trenches to drain into the ground.
For some unknown reason stormwater is treated like an afterthought when it comes to renovations or new dwellings. Sewer drainage in ground is regulated by Sydney Water and needs to be inspected before it is buried. This is not the case with stormwater.
The main problems we find exposed in heavy rain from poorly designed stormwater systems are;
• Under sized pipes.
• Underestimated quantity of water from collection areas.
• Underestimated quantity of water into poorly designed absorption pits.
• No form of mesh, grate or grill to prevent blockage.
• Illegal connections to the sewer.
• Inadequate gradient in pipes.
• Gutters that are blocked with leaves.
• Pump failures in stormwater holding pits.
Each of the examples above can create devastating consequences. For example, we have seen stormwater pumps in basements of apartment blocks fail which floods the carpark and all of the cars in it.
There are still cases of illegal connection occurring to the sewer. In the recent rain we came across entire streets with sewers overflowing because too many people had connected their stormwater to sewer.
If you are doing a new stormwater system at your house then do it properly. Engage the services of a good Hydraulic Engineer to design the system, then get us to install it to the correct specifications. If you don’t know a good Hydraulic Engineer then call us, we use a great one. Do it once, do it properly.