Capacity of the Melbourne Water Drainage System

Consultation has concluded

The lack of capacity of Melbourne Water's drainage system caused the greatest impact in the City of Casey following the February 2011 floods. We want to hear about your experiences during and after the floods.

The drainage system is primarily made up of Melbourne Water's pipe systems, waterways, wetlands, retarding basins and overland flow paths, supported by Council's pipe drains, and overland flow paths along roads and wetlands. Many people considered the Council drainage system to be inadequate, but did not understand that the Council drains were unable to discharge into the Melbourne Water drainage system because the Melbourne

The lack of capacity of Melbourne Water's drainage system caused the greatest impact in the City of Casey following the February 2011 floods. We want to hear about your experiences during and after the floods.

The drainage system is primarily made up of Melbourne Water's pipe systems, waterways, wetlands, retarding basins and overland flow paths, supported by Council's pipe drains, and overland flow paths along roads and wetlands. Many people considered the Council drainage system to be inadequate, but did not understand that the Council drains were unable to discharge into the Melbourne Water drainage system because the Melbourne Water drainage system was incapable of carrying the floodwaters.

Houses were inundated for days and the major arterial roads closed until the flood waters receded in Melbourne Water's Hallam Main Drain. The extended period of inundation following the rains not only magnified community angst, it also significantly impacted on commercial business operations and caused long-term damage to private houses.

Significantly improving the capacity of Melbourne Water's drainage system is therefore a key priority of the City of Casey.


The lack of capacity of Melbourne Water's drainage system caused the greatest impact in the City of Casey following the February 2011 floods. We want to hear about your experiences during and after the floods.

The drainage system is primarily made up of Melbourne Water's pipe systems, waterways, wetlands, retarding basins and overland flow paths, supported by Council's pipe drains, and overland flow paths along roads and wetlands. Many people considered the Council drainage system to be inadequate, but did not understand that the Council drains were unable to discharge into the Melbourne Water drainage system because the Melbourne Water drainage system was incapable of carrying the floodwaters.

Houses were inundated for days and the major arterial roads closed until the flood waters receded in Melbourne Water's Hallam Main Drain. The extended period of inundation following the rains not only magnified community angst, it also significantly impacted on commercial business operations and caused long-term damage to private houses.

Significantly improving the capacity of Melbourne Water's drainage system is therefore a key priority of the City of Casey.

At its meeting on 17 May 2011, Council resolved to write to Melbourne Water advising that it is no longer acceptable to have a drainage system that inundates properties and businesses from rainfall events like that of 4 and 5 February 2011, and at least on two occasions in 2010.

The Melbourne Water drainage system needs to be able to cater for these large rainfall events without damage to businesses and residential properties, and without roads closed for extended periods.

Council also resolved to request that Melbourne Water increases its maintenance on the existing waterways to ensure they can operate at their maximum flow capacity in times of large rainfall events, and to develop, fund and implement mitigation measures to protect residential properties and businesses against the recurrence of such a flood event.