Damp or wet ground

Listed under: plumbing, pipes, drains, Section, moisture, leaks


Unusual rain event / Site unable to cope with heavy rain runoff


  • improve site drainage by installing slotted drainage pipes under the surface. Flexible and solid proprietary products are both readily available. These should be installed in trenches lined with gravel and should slope downwards approximately 10 mm for every 100 mm of length. The excess water should drain to a soak hole or a stormwater system.

  • if human access is not required through the waterlogged site, creating a low-maintenance rain garden is another option using plants such as reeds and irises.


Blocked stormwater drain


  • identify the cause and location of the blockage where possible

  • where rubbish or leaves entering the start of the drain have caused the blockage, rod the drain and try to pull blockage up – avoid pushing it further down

  • if the drain discharges into the street channel at the kerb, rod back up the drain from the street to clear the blockage, then put a hose in the drain near the start to flush the blockage out

  • if you think tree roots invading a drain may be the problem, this can be confirmed by a licensed plumber or drainlayer inserting a CCTV camera on a long cable into the drain. Cutting the roots away with a specialist power tool will offer a short-term solution. Digging up and replacing the affected part of the drain, or the whole length of drain, or the tree, can provide a longer-term solution