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A notch weir is any weir where the physical barrier is significantly higher than the water level except for a specific notch (often V-shaped) cut into the panel. At times of normal flow all the water must pass through the notch, simplifying flow volume calculations, and at times of flood the water level can rise and submerge the weir without ...
Water supply and sanitation in Vietnam is characterized by challenges and achievements. Among the achievements is a substantial increase in access to water supply and sanitation between 1990 and 2010, nearly universal metering, and increased investment in wastewater treatment since 2007.
The Feishayan or Flying Sand Weir (Chinese:飞沙堰) has a 200-meter (660 ft)-wide opening that connects the inner and outer streams. [20] This ensures against flooding by allowing the natural swirling flow of the water to drain out excess water from the inner to the outer stream.
The water availability in Vietnam is supposed to be 830-840 billion m 3 annually from which approximately 37% is generated on Vietnamese territory. More than 2,000 rivers (with a length >10 km) and more than 100 main rivers belong to Vietnam. 13 of these rivers have a basin area of more than 10,000 km 2 with 10 being international ones.
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As this exceeded the demand of northern Vietnam, a 1,487 km north–south high-voltage line had to be constructed. [9] By 2016 the dam accounted for 6% of Vietnam's total electricity output. Each year approximately 10 billion kWh of electricity is generated by the dam, providing around half of the government revenue of Hòa Bình Province . [ 8 ]
A waste weir on a navigable canal is a slatted gate on each canal level or pound, to remove excess water and to drain the canal for repairs or for the winter shutdown. [1] This differs for a dam or reservoir, for which a waste weir is another name for a spillway , i.e. not having the boards to adjust the water height nor the paddles to drain ...
After finishing the drink, many Vietnamese people enjoy eating the piece of chanh muối left in the glass. Outside Vietnam, lemons are sometimes used instead of limes to make chanh muối. The first commercial brand was created by Dan Vo, sold in bottles and bags through Southeast Asia.