In areas of concentrated petroleum development, the impacts on water levels caused by underground water extraction by individual operations can overlap. The state government may declare these areas to be 'cumulative management areas' (CMAs).
OGIA prepares underground water impact reports (UWIR) for CMAs. These reports provide assessments of regional impacts on groundwater levels and establish integrated management arrangements, such as regional monitoring strategies. These reports also identify individual responsibilities of tenure holders in implementing various aspects of the strategies.
When prepared, a UWIR is submitted to the Chief Executive of the Department of Environment and Heritage Protection for approval.