The Manggahan Floodway is an artificially constructed waterway in Metro Manila, Philippines. The floodway was built in 1986, with the cost of 1.1 billion pesos, in order to reduce flooding along the Pasig River during the rainy season, by diverting the peak water flows of the Marikina River to Laguna de Bay, which serves as a temporary reservoir. In case the w…The Manggahan Floodway is an artificially constructed waterway in Metro Manila, Philippines. The floodway was built in 1986, with the cost of 1.1 billion pesos, in order to reduce flooding along the Pasig River during the rainy season, by diverting the peak water flows of the Marikina River to Laguna de Bay, which serves as a temporary reservoir. In case the water level on the lake is higher than the Marikina River, the floodway can also reverse the flow.
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