Narangba Heights Estate is a residential development comprising of over 1,000 lots in the suburb of Narangba within the Moreton Bay Regional Council. Burchills Engineering Solutions was invited by the developer manager of Oxmar Properties to review the site grading for the balance of the development. Subsequently via innovative design approaches Burchills has undertaken detailed design & documentation.
Burchills Engineering Solutions proposed an alternate layout that was more sympathetic with the terrain and had the following characteristics:
- Linear road networked with regular rectangular allotments grouped into precincts;
- Each precinct generally contains a single looped residential access road connecting to a single connector road;
- Connector road generally aligned parallel with contours and adjacent proposed drainage reserve;
- Residential access road generally aligned perpendicular to contours;
- Grade of residential access road limited to avoid the need for side retaining walls;
- Standardised allotment profile between residential access roads with single step retaining wall on rear allotment boundary; and
- All allotments fall to the road to avoid the need for inter-allotment drainage and sewerage.
A 3m high retaining wall is proposed on the rear allotment boundaries to allow the entire balance area to be developed up to the southern property boundary. Maintaining a 2m high retaining wall will result in the loss of allotments on the southern property boundary to accommodate a larger batter.
The proposed layout provides the maximum level area for the allotments whilst minimising the length of roads and civil services. The proposed linear layout provides an extra 327 allotments compared to the original non-linear layout.