Oaks Ave, Dee Why

Storm Consulting were commissioned by Warringah Council to undertake a drainage system for a section of Oaks Avenue in the Dee Why Town Centre

The design entailed hydraulic analysis, development of construction plans, tender specifications and cost estimates.
The project was carried out in three key stages:

  • Investigations Phase which included data review and collation; services co-ordination.
  • Modelling and Concept Design Phase which included Hydraulic Modelling and concept development of drainage works.
  • Detailed Design Phase which covered the development of construction drawings, technical specifications, cost estimation and detailed design report.

The project was commissioned following a catchment wide study of Dee Why which identified high hazard overland flows through Dee Why Town Centre and in particular Oaks Avenue.
The presence of utility services and the flat nature of the existing carriageway proved to be major constraints in the development of the design.
Ultimately the preferred solution which was progressed through to construction, included 4 cast in-situ double grated kerb inlet pits located upstream of the main intersection. The inflow captured was conveyed initially by box culverts, due to the cover constraints, before linking up with twin DN900 mm pipes.
Due to the unique box culvert and twin pipes required a number of transition and junction pit structures were designed.