DA NANG (VNS)— Scientists have expressed concerns about Da Nang's water supply during a workshop titled Water Security for Green Growth.
The experts from Viet Nam and South Korea have suggested that socio-economic activities are to blame for creating problems including pollution and flooding.
"Da Nang City has seen rapid development in the region, but the construction of many hydropower plants on the river systems of Vu Gia and Thu Bon between Quang Nam and Da Nang has caused environmental pollution.The illegal exploitation of gold and minerals upstream in the province has also polluted the water with toxic chemicals," said scientist Nguyen Van Hung from Da Nang University.
He added that Da Nang currently requires 92.5 million of cubic metres to support itself, but that figure would increase to 245 million by 2020. Many enterprises in the city have yet to build their waste water treatment systems effectively, with over 1,000 cubic metres of untreated waste water being discharged each day from 15 of the city's hospitals. Hung predicts that this will cause problems.
The scientists added further examples of how the river developments are causing difficulties. There are four major river systems in the central region from Quang Binh to Quang Ngai Province. Sixteen medium to large hydropower plants have been built in close proximity, causing a change of flow which in turn creates pollution.
Pham Van Chien, an expert from Da Nang's Meteorological Agency, said that this change in flow creates difficulties in predicting flood patterns. "Most current flood forecasts in the central region just use basic surveys, and do not take into account the impact that resevoirs of hydropower plants have had on the change of flow. During the rainy season, which occurs from September, the resevoirs drain water to keep the plants safe, but this causes unexpected floods in the lower area," he said.
The speakers shared their experiences in water supply management and pollution control measures. South Korean scientists gave talks about improving paddy field eco-systems, rubber dams and decentralised water supply systems. The participants in the workshop included experts from the University of Da Nang and the Global Green Growth Institute. — VNS