This little rotating water lakes, natural swamp lakes that appear in the mountains is usually remnants of volcanoes, earthquakes or other causes. The majority of the natural dam lake water is not flowing but also light flow water lake as the Lake of Ba. The saltwater lagoon benefit: the mặm there are many in coastal Vietnam, and being thoroughly exploited. Outdoor artificial water storage and as of 2003, Vietnam had about 3500 reservoir capacity larger than 0.2 million m3. Only the 1976the Lake has a volume of more than 1 million m3, representing 55.9% of the total volume of 24.8 billion m3. Of the Lake on 10 outdoor due electricity management with a total capacity of 19 billion m3. There are 44 provinces and cities in 63 provinces and cities have reservoirs of Vietnam. The province has many lakes is An (249) (166), Ha Tinh, Thanh Hóa (123), Phu Tho (118), Dak Lak Province (116) and Specific (108).Among the irrigation pond by the 1957 Ministry of agriculture and rural development (Vietnam) managing manure according to have capacity: 79 Lake has over 10 million m3 capacity, 66 indoor capacity from 5 to 10 million m3, 442 Lake from 1 to 5 million m3, 1370 Lake from 1 to 2 million m3. The total capacity of this reservoir is 5.8 billion cubic meters of water to irrigate 505.162 hectares.Other Lake ecosystem with pond and dam in depth: the light was shone into the only surface water, so the water is divided into 2 classes:The water layer on the illuminated should the floating plant-rich, high oxygen concentrations, the gas exhaust oxygen in photosynthesis and the temperature of the water layer on the double change depends on air temperature.The layer of water below the missing light, stable temperature (40 c), low oxygen levels, especially in the case of the fermentation of organic bottom.
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