Overland Flow Certification

HYDRALINC is Australia’s leading consultancy in the investigation of overland flow. We have extensive experience ranging from small building projects to large subdivisions. Our staff have worked directly with several Councils in developing their overland flow maps, so we know our stuff.

HYDRALINC takes a staged approach with overland flow assessments. In many cases the flood extent shown by Council will be conservative due to the exclusion of underground pipes. Therefore an initial verification may show that your development is not affected to the extent envisaged.

We provide competent overland flow reports certified by a qualified engineer (RPEQ). Our state-of-the-art 2-dimensional technology provides greater certainty in design and potential savings in construction costs. Don’t risk project delays or a Council Information Request – get it right the first time.
Contact us today for a no-obligation quote.

¹What is overland flow?
The exact definition of “overland flow” varies between Councils. Overland flow occurs after heavy rainfall events, and is most often the water which concentrates and travels overland before entering a waterway or piped stormwater system. The example figure shows overland flooding in a residential catchment. Overland flow can be unpredictable and lead to property damage, and therefore must be carefully managed.

Managing Overland Flow
State Government requires Councils to manage the risk of overland flooding through planning and development controls. For example, a new building development should be protected from overland flooding, and overland flooding should not be worsened on adjacent properties due to the development. In some cases a new building may need to incorporate an undercroft to allow for the passage of overland flow. In other cases overland flow can be managed through careful design and landscaping.

Overland Flow Assessments
HYDRALINC has undertaken the following overland flow assessments since August 2012: