Age: MELBOURNE’S dwindling water storages are on the verge of a historic low, a quarter of a century after the Thomson Dam was promised to drought-proof the city. The nine major dams are expected to fall to 28.4 per cent of capacity today, matching the record low set in June 2007. Despite rain being forecast for today, a new record is expected to be set within days, depending on consumption rates. The grim statistics mean Melbourne’s dams are holding enough water to supply …