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Forest Grove Kanahooka Dam Break Analysis

Forest Grove Dam Break Analysis

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Project details

The Forest Grove Dam Break Analysis project assessed the risk of multiple storm scenarios and dam breakage in a large residential basin. Orion modelled the potential impacts on downstream residential properties and infrastructure in the event of dam collapse due to a flood event and used the findings to inform risk classification.

Overview of engagement

Douglas Partners engaged Orion to model the potential impacts of the existing dam collapsing, assessing its effect on local areas under sunny conditions and during numerous storm events.

Specifics of engagement

The assessment area covered numerous residential and commercial properties. The local community utilises a cafe and boardwalk adjacent to the large basin for recreational purposes. The basin was identified as a high-risk hazard given its size, proximity to multiple residential properties, and public use.

What was done

In collaboration with Douglas Partners, Orion’s design team conducted visual and geotechnical inspections to determine potential dam failure scenarios and assessed the critical drainage infrastructure within the catchment.

Orion developed hydrological models to evaluate inflows into the dam and identify any flow restrictions.

Utilising 2D modelling, Orion calculated the anticipated extent of flooding during a powerful storm. Orion then used this identical modelling to simulate a dam collapse at the storm’s peak intensity.

The modelling and a comprehensive report were delivered to the client as part of the dam classification process.

Value to the client

Through modelling the potential effects of dam break and flooding on the local infrastructure and surrounding areas, Orion demonstrated that any impact would remain localised around the existing dam.

Although Orion identified a high risk for downstream empty rural land, it was projected that there would be minimal impact on existing residential areas.

Services

Design

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Forest Grove Kanahooka Dam Break Analysis

Orion’s Team was engaged by the client to analyse the Forest Grove Dam, assessing the risk of potential dam break during severe storms and the impact on local properties and recreation areas.

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Forest Grove Kanahooka Dam Break Analysis

Forest Grove Kanahooka Dam Break Analysis

Orion’s Team was engaged by the client to analyse the Forest Grove Dam, assessing the risk of potential dam break during severe storms and the impact on local properties and recreation areas.

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