Overflowing stormwater drain


Listed under: plumbing, drains, Services

Cause

Overflowing stormwater drain 

Repair

  • remove rubbish blocking the drain by pulling it out – avoid pushing it further down the drain. If necessary, rod the drain and try to pull the blockage up

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

  • if you cannot unblock the drain call a registered plumber or drainlayer

Cause

Tree roots blocking drain 

Repair

  • blockages caused by tree roots can be confirmed by a registered plumber or drainlayer inserting a CCTV camera on a long cable into the drain

  • a short-term solution is for the plumber/drainlayer to cut the roots away with a specialist power tool

  • some plumbers/drainlayers offer internal patching solutions once the roots have been removed

  • digging up and replacing the affected part of the drain, or the whole length of drain, can provide an effective longer-term solution

  • removing the trees is another option

Cause

Stormwater pipe outlet that discharges into street is blocked 

Repair

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

  • if you cannot unblock the drain call a registered plumber or drainlayer

Cause

Drain is too small for stormwater catchment 

Repair

  • engage a designer or registered plumber or drainlayer to calculate what dimension of stormwater pipe is required for the catchment area and the location

  • engage a registered plumber or drainlayer to relay the drain with larger diameter pipes

  • an alternative option is to consider on-site alternatives such as a soak pit, detention tank or rain garden

  • if constructing a soak pit, follow the guidance in New Zealand Building Code Verification Method E1/VM1. Be aware that construction of a soak pit may require a building consent