Permeable paving may be the answer.
City of Mitcham demonstrated how permeable paving in combination with uncompacted subgrade and substrate stablising mesh at Hillview Road, Netherby provides another cost-effective solution to local flooding at the recent Permeable paving and infiltration systems seminar and site tour hosted by Water Sensitive SA
The Hillview Road project site was excavated to approximately 400mm to natural material. Gravel of 20 mm diameter was then laid to a depth of 150 mm, without a bedding layer. A structural stabiliser HDPE mesh (Geoweb) was then installed across the entire road surface, overlain by a further 150 mm of 20 mm gravel.
The Adbri Trihex paver was installed directly over the gravel layer and was backfilled by 2-3 mm screenings in the voids between the pavers.
The project has a subsurface detention storage of 20,000 litres within the voids of the gravel, with excess stormwater flowing to a 225 mm pipe in the road verge.