Client: Residential Homeowner
Location: Auckland
Scope: Drain unblocking, pipe CCTV inspection, stormwater repair
Timeline: Two-stage excavation and reinstatement
What started as a simple unblocking turned into something a lot messier.
During a recent heavy downpour, a client reported surface flooding on their driveway. Water was pooling in front of the garage and showed no sign of draining — a clear sign the stormwater cesspit was overwhelmed or blocked.
Our team was booked for an urgent unblocking, and on arrival, flooding was visibly affecting the driveway.
Initial attempt: Hydro flush + hose stuck
We began with a standard hydro flush to clear the cesspit outlet. While we managed to restore some flow and relieve the surface flooding, our hydro hose became stuck in the pipe — a red flag indicating a more serious obstruction further down the line.
Next step: CCTV Inspection & Locate
After several unsuccessful attempts to retrieve the hose, we conducted a CCTV inspection. The camera revealed an unknown obstruction — potentially a broken pipe — blocking the line. With the client’s approval, we proceeded to plan and quote a proper excavation.
Excavation reveals shocking find: Concrete slurry in stormwater line
Once excavated, we cut into the 100mm PVC pipe at the located mark. Inside, we found a solid mass of concrete slurry — hardened and wedged within the pipe with a thickness of 40–50mm. That’s half the diameter of the pipe, effectively choking off stormwater flow and trapping our hose.
The hose was safely retrieved, and the remaining line was re-inspected and flushed. Unfortunately, we discovered a second blockage about 10 metres downstream.
Second dig, same story: More concrete removed
With the client’s go-ahead, we carried out a second excavation. Sure enough, more set concrete slurry was discovered and manually removed.
Final CCTV inspection & reinstatement
After a full flush and final CCTV run, we confirmed no further obstructions were present in the stormwater system. The damaged sections of pipe were repaired, and both excavation areas were reinstated neatly.
A reminder: Cement and stormwater don't mix
This job serves as a clear warning — concrete slurry should never find its way into stormwater systems. Whether through carelessness or poor site management, it can cause major issues down the line. Fortunately, this client acted fast, and we were able to restore full function and prevent further property damage.
👉 Need help with blocked stormwater lines or mystery flooding?
Contact the Abbotts team here.
