Wednesday , November 25 2020

Why does Da Nang suffer from severe water shortages?



Mission of the Department of Water Resources Management of Water Failure in Da Nang.

Mission of the Department of Water Resources Management of Water Failure in Da Nang.

Water shortage due to river water intrusion, hydropower not enough water?

At the meeting, Ho Huong – General Director of Da Nang Water Supply Joint Stock Company (Dawaco) said the reason for widespread water shortages in Danang recently due to the salinity of the Cau Do River suddenly increased. In addition, the rain this year a record water reservoirs in the upstream can not drain enough water for the factory to provide water for living in the city.

Deputy Director of the Department of Water Resources Management Tran Vinh Tran (White Shirt) to investigate the actual water supply at Cau Do Water Factory - Da Nang

Deputy Director of the Department of Water Resources Management Tran Vinh Tran (White Shirt) to investigate the actual water supply at Cau Do Water Factory – Da Nang

According to Huong, A Trach Pump Station has 6 pumps, of which 4 are driving and 2 are spare parts. When operating 4 pumps at engine capacity, the total capacity per day and night is 196,000 to 217,000 m3. The raw water transmission line from An Trach pump station to Cau Do water plant was constructed at a capacity of 210,000 m3 / day. Therefore, the amount of raw water from An Trach Pump Station to Cau Do Water Factory reaches a maximum capacity of 210,000 m3 / day. Meanwhile, demand for daily water in Danang is 270,000 m3 per day.

Meanwhile, when the Cau Do River was contaminated with saltwater, raw water from An Trach pump station was not enough to deliver drinking water. Many shops, houses with maximum water storage. As a result, Dawaco has to cut off rotary water, which leads to a widespread water shortage.

At the same time, the Department of Natural Resources and Environment in Ho Chi Minh City registered on the days of water shortage in Da Nang (4-7/11), the salt content of Cau Do is regularly maintained more than 1000 mg / l, peak day over 4,300 mg / l (while salinity permits only 250 mg / l). However, Dak Mi Hydropower has flushed through the drainage port after the dam to meet the demand for raw water supply for TP. Da Nang during the period of water supply in salt Cau Do River. Thanks to this coordination, the water level at An Trach damm was raised above the dead water level.

Record low deposition, the hydroelectric is equal to dead water

According to representatives of hydropower plants in the two provinces of Quang Nam and Da Nang, although it is a rainy season, the year's rainfall is low, so dams die, even below dead water levels.

During the rainy season, but in the upstream disc, Cau Do River water is salty, not enough raw water for the waterworks.

During the rainy season, but in the upstream disc, Cau Do River water is salty, not enough raw water for the waterworks.

According to the representative of A Vuong Hydroelectric, the water in the reservoir is only 1.1 meters higher than the water level. Recently, A Vuong hydropower has increased to loosen downstream but not significant. Relative to the annual rainfall in the Vu Gia basin, the lowest since 1977 is present.

Representative of Song Tranh Hydropower said that the volume of lakes in October is 70 m3 / s by 27% on average many years, very exhausted. In November, the largest flood was 43.5m3 / s, which corresponds to 10% on average for many years. Compared with the 45-year cycle, this is a record low. At present, the situation of saltwater intrusion in Hoi An, Duy Xuyen (Quang Nam) is very heavy.

Water business representatives suggest that they have water storage facilities that adapt electricity generation, as the outlook for the dry season becomes very serious, it is difficult to supply downstream water and to ensure energy security.

By acknowledging the comments at the meeting, Chau Tran Vinh Deputy Director of the Water Resources Management Department said the flood of the year is very special. All traffic, the capacity of lake irrigation is 70-80% lower. High risk of drought occurs during autumn next year in the Vu Gia – Thu Bon basin. Therefore, four large reservoirs must be carefully observed, closely coordinated with the authorities, related authorities in Quang Nam, Da Nang.

As for the management of the operation of Dawate's water system, Vinh said that through the water survey, from the beginning of the flood season to now, the water source for the Cau Do waterworks is active. The lack of water due to high salinity is related to the function of the plant. Vinh proposed early solutions to improve operational efficiency, ensure that water availability is continuous and stable for the people.

Tam An


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