Kanumbra St – Overland Flow & Flood Study

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Project no. 6387

Alterations and additions were proposed to an existing residence in Kanumbra St, Coorparoo.

The site however is located within a Brisbane City Council (BCC) nominated overland flow path. BCC’s Subdivision & Development Guidelines (now superseded by the Brisbane City Plan 2014) required an overland flow and flood study in order to satisfy nominated flood immunity requirements.
 

BE Collective’s Civil Team were commissioned to:

  • report on the overland flow and flooding
  • confirm minimum habitable floor level with reference to the Guidelines.
     

Flood Modelling was required to demonstrate flood immunity of the site. BE Collective undertook 3-dimensional modelling of the overland flow path upstream and downstream of the site to obtain the flow characteristics. BCC contour maps where referenced to assist in modelling the upstream and downstream catchments, as a full catchment survey was not feasible. The length of the upstream catchment was approximately 600m with a total area around 15-hectares. The 3-D modelling and analysis allowed us to obtain accurate site-relevant values. Results were also validated utilising first principles. Our detailed calculations and reporting supported Development Approval.

 

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