Cwsa systems fully restored but rationing in place CEO of the CWSA, Garth Saunders Social Share The Central Water and Sewerage Authority (CWSA) systems have been 100 per cent restored, but a system of rationing has been put in place as of April 22. And, consumers have been asked to help in the conservation of the precious commodity as river flows are low while demand for potable water is high, a bulletin from the Authority said. It was explained that the rationale is to turn off water at night to allow the capacity to build, which will enable people especially at higher elevations, to obtain a supply in their taps.