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The Manggahan Floodway is an artificially constructed waterway in Metro Manila, Philippines.The floodway was built in 1986, [1] 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.
From the official protected landscape area, the Marikina River then flows through its namesake city, Marikina. Near the boundary of Marikina and Pasig cities, the river meets the gates of the Manggahan Floodway, a controlled waterway used to prevent flooding in Manila during heavy rains by diverting most of the water of the Marikina towards Laguna de Bay (i.e. Laguna Lake) instead of the Pasig ...
One estimate ranks the Philippines as the world's third largest producer of oceanic plastic waste. [53] The Pasig River deposits 72,000 tons of plastic into the sea annually, mostly during monsoons, placing it among the world's top 10 rivers that bring plastic waste to the sea. [54]
The banks of the river attracted informal settlers and the remaining factories dumped their wastes into the river, making it effectively a huge sewer system. Industrialization had already polluted the river. [1] In the 1930s, observers noticed the increasing pollution of the river, as fish migration from Laguna de Bay diminished. People ceased ...
The Marikina North Sewage Treatment Plant is a sewage treatment plant in Marikina, Metro Manila, Philippines. Managed by Manila Water, the facility is one of several sewage treatment plant in the Philippines processing 100 million liters (26,000,000 U.S. gal) of used water daily. [1]
In 2018, the river suddenly began to change color due to gold mining. The river recorded the highest level of microplastics ever reported in river water globally in early 2024. [16] [17] Plastic pollution, heavy metals and cyanide contamination as a result of illegal gold mining, and human generated waste. [18] Threatening the Osun Osogbo ...
Tanza River Drains water from Navotas. Connects with Dampalit River. Dumps water to Tangos River. Tullahan River: Major channel. Drains water from La Mesa Dam, as well as the northern part of Quezon City, Valenzuela, Malabon and Navotas. Mouth is at Navotas. Tunasan River: Drains water from Muntinlupa. Dumps water into Laguna de Bay. Zapote River
The San Juan River is one of the main river systems in Metro Manila, Philippines, and is a major tributary of the Pasig River. It begins near La Mesa Dam as the San Francisco del Monte River , which officially takes the name San Juan River when it meets with Mariblo Creek in Quezon City .