(1) What (a) amount has been spent on the project to raise the Hazelmere Dam wall to date and (b) are the relevant details of the expenditure; (2) what (a) was the annual percentage increase in sedimentation of the Hazelmere Dam over the past five years, (b) impact has this had on the storage capacity of the dam and (c) are the causes of the increased sedimentation; (3) whether any action has been taken to reduce and halt further sedimentation of the dam in future; if not, why not; if so, what are the relevant details?