How do I know if my septic absorption trench has collapsed?
Ensure you understand the telling signs of septic trench failure
Septic absorption trenches play a pivotal role in the overall septic system, as it’s where the broken-down effluent flows once leaving the tank.
Trench failure is a common contributor to sewage management system problems. Generally speaking, trenches fail if the gaps in the pipes which channel to the trenches are clogged, or if the effluent isn’t able to drain away or evaporate properly.
How to tell that your septic trench has collapsed
If properly constructed, septic absorption trenches should last between 15 and 25 years, though if not adequately built or maintained, significant issues can arise quickly following installation. If you have a septic system installed on your premises, it’s worth keeping a lookout for telling signs of its failure.
Common symptoms of failure to the septic absorption trench include:
- Uncharacteristically quick & vast growth of grass over the trench
- A soggy, foul-smelling area
- Toilets draining inefficiently
- Other general household plumbing issues, including but not limited to drainage and bathroom problems
If any of these signs are being exhibited by your septic absorption system, it is advised that you get in touch with a fully-licensed technician as soon as possible. Call Express Wastewater today on 1300 722 517 , or complete a job booking form.
Causes of absorption trench failure
There are numerous causes of absorption trench failure. The most commonly documented of those include:
Uneven wastewater distribution
If the system is designed properly, wastewater will flow evenly along the absorption trench, enabling a preferable distribution of water absorption. Problems can occur, however, when certain areas of the trench are more absorbent than others, or blockages happen within the piping.
Trench compacting
This can occur as a result of pressure from animals, frequent foot traffic and vehicles in the trench vicinity. In this instance, the septic pipe structure can become compromised, preventing trench water flow.
In addition to this, collapsing trenches can be a result of the driveway or paving construction above the trench area, causing pipe movement and ultimately flow disruption.
Excessive water usage
If the expected volume of wastewater in your home is exceeded, the septic system can potentially be flooded with a liquid oversupply relative to its designated capacity.
Trench blockages
The failure of a trench’s protective layer can cause unwanted materials to infiltrate the system, resulting in a blockage. Another regular cause of blocked septic trenches is sludge and scum flow from the tank into the absorption trench, usually caused by the tank not being pumped out frequently enough.
Trees pose another risk of trench blockages. Absorption trenches contain a high amount of rich nutrients, which are sought out by the roots of trees. To minimise this particular risk, it’s advised that only plants with shallow root systems will be planted in the absorption trench’s vicinity.
Avoiding a collapsed absorption trench
Often, trench collapses can occur from no fault of your own. However, there are ways in which you can assure a properly-functioning system.
The NSW government’s Easy Septic Guide outlines the do’s and don’ts of absorption trench maintenance:
Do:
- Undertake proper soil tests to determine how the optimal length of your trench.
- Install trenches in a sunny, well-exposed area.
- Install fences or barriers to protect the trench from animals, cars, and frequent foot traffic.
Don’t:
- Install structures that will shade the disposal area. Sun exposure is essential to aiding the breakdown and evaporation of effluent.
- Drive cars over the disposal area, or allow animal moments in the area. This can threaten the structural integrity of the piping.
- Cover trenches with concrete/paving.
- Level diversion contour mounds.
If you suspect there is an issue with your septic system’s absorption trench, or have any questions regarding the contents of this article, get in touch with Express Wastewater on 1300 722 517 or via our booking form.
Sources used:
https://www.waternsw.com.au/water-quality/catchment/living/wastewater/systems/absorption