What are the trigger points for removing the temporary weir if it is built?
The weir near Pomanda Island would be designed to be a temporary structure and if built, it would be removed when all of the following criteria are met, as agreed by the South Australian Water Security Council: • Storage levels in Hume and Dartmouth reservoirs have returned to normal operating levels and South Australia is confident that the temporary weir is no longer needed to protect public water supplies • Salinity levels in the lakes have dropped to below 3,000EC (drinking water must be below 1,400 EC and the Lower Lakes are currently between 7,000EC and 10,000EC) • There are no other risks from poor quality water in the lakes moving upstream into the river • South Australia is confident that the temporary weir is no longer needed to protect public water supplies. Since the temporary weir near Pomanda Island does not include any flow control structures, once the water level in Lake Alexandrina rises and exceeds +0.1 m AHD (0.1m above sea level), the temporary weir near Pomanda Isl
