Client: Byron Shire Council
A village at New Brighton was lost in the 1970’s and, at Byron Bay, erosion of Belongil Spit and flooding of Belongil Creek due to elevated ocean levels and stormwater runoff are severe problems.
BMT undertook a detailed technical coastal and ocean process investigation and Coastline Hazard Definition Study in line with the NSW Government’s Coastal Policy (1997) and its Coastline Management Manual (1990).
Outcomes and Benefits
This study is the first stage in development and implementation of a Coastline Management Plan for the Shire. Hazards include: long term (non-reversible) shoreline recession and oceanic inundation associated with storm tides, sea level rise (climate change) and a prevailing net sand loss alongshore; short term (reversible) beach erosion; and stormwater discharge impacts.
These were assessed for the required planning timeframes for each of four major beach compartments. Cumulative hazard zones were defined for immediate, 50 year and 100 year planning periods and mapped using GIS techniques. The report was adopted by the Byron Shire Council in late 2000 and forms the basis for consideration of future coastal works and management options for the Shire’s coastline.
Services and Expertise Provided:
The Brisbane River Catchment Flood Study is the most detailed and comprehensive flood study ever undertaken in Australia. The hydraulic models that were developed underwent rigorous calibration. A sophisticated Monte Carlo approach was used to hydraulically model 11,340 flooding scenarios. The result was a robust and defendable set of design events. The study was fully peer reviewed by a panel of independent experts.
BMT conducted a Pilot Study of the College Park Landfill (CPLF), a 30-acre site operated as a municipal landfill from 1954 through 1978. Following closure, a cover was applied, but it was not closed in accordance with regulatory requirements. As landfills are known for their ability to mobilize hazardous substances into surrounding media, the CPLF was added to the U.S. Superfund (CERCLA) program for further evaluation.
Environmental risk assessment of siltation dredging and dredge material management.
Assessment of the wetland meeting the Ramsar nomination requirements