A blocked stormwater drain isn’t just annoying, it’s a real flood hazard.
Don’t Let a Blocked Drain Wreck Your Home
Whether you’re dealing with water pooling in your yard, overflowing grates, or soggy lawns after rain, a blocked stormwater drain could be the culprit. Stormwater drainage issues are common in Australian homes, particularly in areas like Sydney where older infrastructure and tree-heavy landscapes cause recurring problems.
In this guide, we’ll cover how to unblock a stormwater drain, what causes them, and how to clean and maintain your drainage system for the long run.
Common Causes of Stormwater Drain Blockages
Blocked stormwater drains usually don’t happen overnight.
Tree Roots in Pipes
Tree roots are the #1 cause of blocked stormwater drain Sydney issues. They infiltrate cracks in pipes, especially older earthenware pipe systems, and grow over time until the drain is completely blocked.
Silt Build-Up
Over time, dirt and silt from roof runoff, driveways, and gardens accumulate and compact, especially in drains without regular maintenance.
Leaves, Twigs and Debris
Leaves and debris from nearby vegetation can easily block surface grates and build up inside pipes.
Poor Installation or Damaged Pipes
Squashed pipe sections, poorly joined PVC fittings, or collapsed lines from construction can restrict flow and cause frequent backups.
Options for Clearing Stormwater Blockages
You have several methods at your disposal to tackle the issue.
Use an Electric Eel to Rod the Line
This method is effective for earthenware pipes and hard blockages.
- Access the pipe via a downpipe or create an opening with an angle grinder
- Feed the electric eel in, rotating it to cut through roots or compacted material
- Wear protective gear and proceed cautiously
Use a Water Jet for PVC Pipes
Water jets are powerful and safe for plastic.
- Ideal for newer PVC pipes
- Pushes out silt and loose debris with high-pressure water
- Not as effective on deep, thick root masses
Dig and Replace with Plastic Pipe
If the damage is extensive or blockages recur:
- Excavate the affected pipe section
- Replace with smooth, durable PVC
- Consider a root barrier if trees are nearby
Try a Drain Auger for Stubborn Blocks
For deeper access and precision, an auger can outperform basic rods or snakes.
- Break up tough blocks without needing full excavation
- Ideal for accessing longer pipe sections
Use Drain Rods or a Plumber’s Snake
Basic tools still get the job done.
- Best for short to mid-length blocks
- Twist and push through the block
- Follow up with a water flush
Understanding Where Your Stormwater Goes
Knowing your drainage path helps you diagnose faster.
Check for Easement or Street Connections
In most homes, stormwater drains either:
- Flow to the street via kerb outlets
- Lead to a backyard absorption pit
- Run to a council easement
Dealing with Absorption Pits
Older homes may rely on underground absorption pits, which fill over time.
- Roots grow into the pit
- Silt accumulates, reducing absorption
- Eventually, it needs to be rebuilt or replaced
When to Use a Submersible Pump
If local rules permit, you can install a submersible pump to redirect water from your pit directly to the street. This is effective in low-lying areas or places with poor soil drainage.
Tips for Dealing with Different Pipe Materials
Not all drainage systems are the same.
Earthenware Pipes
- Common in older Sydney homes
- Prone to cracks and root intrusion
- Use an electric eel for cleaning
PVC Pipes
- Smooth, modern, and less prone to blockages
- Susceptible to cracks from pressure
- Best cleaned using a water jet
How to Clear a Blocked Stormwater Drain: Step-by-Step
Here’s your go-to process for safe stormwater drain clearing:
- Inspect visibly blocked areas like grates, pits, and downpipes
- Remove surface debris by hand or with a shovel
- Flush with a garden hose to check water flow
- Use a high-pressure washer for deeper flushing
- Insert a drain rod or snake if water backs up
- Try a toilet auger or mechanical eel for tough blocks
- Repeat flush test to confirm blockage is cleared
- If unresolved, call a professional block drain plumber with CCTV and hydro jet tools
Safety First: What You’ll Need
Be prepared before you begin.
- Rubber gloves and goggles
- Screwdriver or wrench (for grates or caps)
- Garden hose or pressure washer
- Drain rods or snake
- Auger or eel (if needed)
- Rubbish bags for collected debris
How to Unblock a Blocked Stormwater Drain Preventatively
A little effort now saves a lot later.
- Clear gutters and drains every season
- Install leaf guards over grates
- Check for slow drainage after storms
- Schedule annual inspections, especially if you have large trees nearby
Need more home drainage tips? Check out this guide on early signs of blocked drains.
Your Next Move for a Clear Drain
To sum up, a blocked stormwater drain clearing doesn’t have to end in flooding or expensive repairs.
Whether it’s silt, tree roots, or poor piping, understanding how to clear a blocked stormwater drain can save you time, water damage, and money.
Have a recurring issue or just want peace of mind? Get in touch with our expert team today for a no-obligation inspection and quote.
Frequently Asked Questions
1. What’s the best way to clear stormwater blockages caused by tree roots?
Use an electric eel for older pipes or replace them with PVC to prevent regrowth.
2. Can water jetting be used on all pipe types?
Water jetting is safe and effective for PVC, but not ideal for thick root blockages in older clay pipes.
3. What are absorption pits, and how do they affect stormwater drainage?
They allow stormwater to seep into the soil. Over time, they become blocked with roots or silt and may need to be rebuilt.
4. What’s the risk of using an electric eel on PVC pipes?
Electric eels can crack PVC if used aggressively. Water jetting is the safer option for plastic piping.
5. Can I pump stormwater to the street if the existing system fails?
Yes, with council approval, a submersible pump can redirect water to the street drainage system.
