Enoggera Road Hydraulic Impact Assessment

Lloyd Street Service Station

Location: Alderley, Brisbane, QLD


A Hydraulic Impact Assessment was carried out to support the development application for a proposed service station, located on the corner of Enoggera Road and Lloyd Street, Alderley.

The site hydrology was subjected to a highly urbanised catchment, consisting of 14 sub-catchments, with the proposed development significantly altering the local storage of the site and subsequently requiring a new stormwater drainage system underneath the site.


  • Hydraulic modelling for the 1, 2, 5, 10, 20, 50 and 100 year ARI design storm events for pre- and post-development scenarios
  • Hydrologic modelling for the 1, 2, 5, 10, 20, 50 and 100 year Average Recurrence Interval (ARI) design storm events
  • Two dimensional, unsteady hydraulic model incorporating sub-grid scale piped drainage networks using one-dimensional modelling to estimate flood levels within the area