Engineers who designed the scheme expect to put it on public display in the autumn and to appoint a contractor shortly afterwards.
The OPW is paying for all the defence works which will stretch along the Glashaboy River from Sallybrook down to the estuary at Glanmire village.
The plans include new culverts and 800m of flood defence walls adjacent to the Sallybrook Industrial Estate.
A further 300m of defence embankment/walls will be built at Hazelwood, with a new bridge installed between the Hazelwood and Crestfield shopping centres which will be more elevated than the current one.
Additional culverts will also be created around this area.
It is hoped this work will protect the Hazelwood shopping centre, in particular, which was particularly badly hit during the flood of June 28, 2012.
On the same day all 48 houses in nearby Meadowbrook estate were also hit — some on the south-eastern side of it were engulfed in up to 5ft of water.
Engineers plan to build a 345m-long defensive wall between the river and the estate and plan “water conveyance improvements” at Riverstown Road Bridge by clearing the western and eastern arch. Not much more can be done to the bridge as it is a protected structure.
In addition, a stormwater pump and collector drain will also be installed in Meadowbrook and work will be carried out on the southern section of the estate’s entrance adjacent to O’Callaghan Park.
Some houses were flooded in the estate again when Storm Frank hit on December 29 last, although not to the same extent as the 2012 incident.
Storm Frank caused far more serious damage to a number of houses at Copper Valley View.
In an effort to prevent a repeat of that, engineers are to replace a culvert on the Butlerstown stream at Brooklodge and carry out culvert upgrades and water flow improvements on the Glenmore stream which runs outside the lower entrance to Copper Valley View.
Further south, on the Riverstown to Glanmire village main road, individual property protection measures are to be installed at St Patrick’s Mill, and The Fountains flood defences barriers will be built at The Groves and a 635m-long flood defence wall will be constructed at the river side of Glanmire Business Park along to Barry’s Terrace.
Councillor Ger Keohane (Ind) said the design seemed very comprehensive and he hoped construction would go ahead as planned to give peace of mind to the scores of residents and businesses in the area who suffered in recent years, especially as the majority of them can no longer get flood insurance.
He said council workers were to move in next week to kill off Japanese knotweed along the river banks, because this has to be done before construction starts.