Greenhill Road Infrastructure Works — Watch for Drain Disruptions
City of Unley · Council intelligence · Last updated April 2026
“NOTICE OF MOTION FROM COUNCILLOR M BRONIECKI RE: WALKING AND CYCLING INFRASTRUCTURE ON GREENHILL ROAD”
Full Council, 23 March 2026
They're looking at tearing up sections of Greenhill Road to put in walking and cycling infrastructure — that's the northern boundary of Clarence Park right there. When they start digging along that corridor, older service lines running under or near the road can shift. If you're on a street that backs onto Greenhill, keep an eye on your drains and water pressure.
“Administration work with staff from the City of Adelaide and the City of Burnside to investigate the provision of improved walking and cycling infrastructure along the southern boundary of the Adelaide Park Lands fronting Greenhill Road from Anzac Highway to Fullarton Road.”
Full Council, 23 March 2026
This stretch runs right past Clarence Park's front door. Three councils coordinating means a bigger project, more ground broken, and a longer window where nearby pipes and connections are at risk from vibration and soil movement. Worth getting old terracotta lines checked before works ramp up.
“The total cost to Council of maintaining the playing surface at Unley Oval for football and cricket differs from year to year as there are various factors that can impact cost. For the 2024-25 financial year, the total cost to Council was $85,172 (excluding GST). This comprises a cost of $28,372 for football (excluding temporary fencing for Sturt Football Club matchdays) and $56,800 for cricket.”
Full Council, 23 March 2026
Not directly a plumbing issue, but Unley Oval sits close by and ground maintenance on sports turf means irrigation lines, subsurface drainage, and a lot of water moving around. If you're in the streets near the oval and you're seeing damp patches or slow stormwater clearing off your block, it's worth ruling out cross-connection or surcharging from nearby infrastructure.
Clarence Park sits tight between Goodwood and Black Forest — mostly 1950s and 60s brick homes on clay, with ageing terracotta drain lines that don't love ground movement. The City of Unley is looking at road and infrastructure works along Greenhill Road, which runs right along the suburb's northern edge. Any digging in that corridor puts pressure on older service connections nearby, and in streets like Clarence Park's closer to the boundary, that can mean cracked junctions, slow drains, or a hot water unit playing up after ground shift.
Clarence Park's drainage story is mostly about age and soil. If you've got slow drains or backups that started suddenly, ask yourself whether the council's been working nearby — sometimes the issue isn't in your pipes, it's pressure from outside works affecting your junction. Same goes for internal leaks: the copper in these homes is mostly original or 40-year-old replacement, so pinhole corrosion is real. Get ahead of it before you've got wet walls or a flooded laundry. One practical tip for Clarence Park residents: if you're on a flatter block or closer to the reserve, keep your stormwater clear and flowing in May through September. These older systems weren't built with climate variation in mind, and even a moderate rain event can back up if there's leaves or silt blocking the underground run. A cheap camera inspection now can save you a flooded yard in winter.
- Blocked terracotta drains in 1950s–60s brick homes — roots work in at the joints, and clay soil movement makes it worse. Classic on the older estates around here.
- Cracked or collapsed sewer junctions from clay heave — Clarence Park's on a clay base that shifts with wet and dry cycles. The old earthenware pipes don't flex with it.
- Slow or backing-up stormwater on flat allotments — the older blocks near Clarence Park reserve don't have proper fall, and the underground spouting was never sized for the rain events we get now.
- Leaking copper supply lines — pitting and pinhole corrosion in the original or early-replacement copper that's been in most of these homes since the 70s or 80s.
- Hot water unit failure — a lot of original or single-replacement units are well past their tick. When they're 15–20 years in, they tend to go in winter.
- Service line pressure from council infrastructure works — City of Unley digging on Greenhill Road puts stress on older junctions in nearby streets. If your drains suddenly change, that's often why.
- Stormwater overflow during heavy rain — the April downpour showed it — these older underground runs flood when rain exceeds their design capacity.
- Tap and fitting corrosion — the older brass fittings and stopcocks in Clarence Park homes are starting to pit and seize. Getting them off without damage takes patience.
- Burst pipes from frost or ground movement — less common than warping, but clay soil shift and winter frost can both cause failure in exposed copper runs.
- Leaking toilets and cisterns — original or long-in-service ceramic and brass cistern parts fail quietly and waste thousands of litres. Worth checking on older homes here.