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The LLDA notes that the Pagsanjan River Subwatershed is the second largest of the 21 sub basins that feed into Laguna de Bay, covering 311.77 square kilometres (120.38 sq mi), [16] and since it feeds so much water into the lake, it is "one of the biggest contributors of pollution loading". [8]
Laguna de Bay (Spanish for "Lagoon/Lake of Bay"; Filipino: Lawa ng Bay, ), also known as Laguna Lake and alternatively spelled "Laguna de Bae", [1] is the largest lake in the Philippines. It is located southeast of Metro Manila , between the provinces of Laguna to the south and Rizal to the north.
The Laguna Lake Development Authority (LLDA) was established in 1966 as a quasi-government agency that leads, promotes, and accelerates sustainable development in the Laguna de Bay Region. [2] Regulatory and law-enforcement functions are carried out with provisions on environmental management, particularly on water quality monitoring ...
The San Juan River (Tagalog: Ilog ng San Juan), also known as the Calamba River, is a river system in Calamba, Laguna, Philippines.It is one of 21 major tributaries of Laguna de Bay and is regularly monitored by the Laguna Lake Development Authority (LLDA) through one of its 15 river monitoring stations.
The overall objective of the rehabilitation is to improve environmental management particularly with waste-water management and urban renewal. There are even talks about using Laguna de Bay for drinking water to supply the growing population of Metro Manila, on the condition that the river and surrounding waterways are cleaned and kept clean.
These include the Bankaan Creek in Barangay Parang, the Concepcion Creek in Barangay Concepcion Dos, and the Usiw Creek in Barangay Santa Elena. Instead, these waterways are linked in a complex network with the Balanti, Halang, and Muntingdilao Creeks and the Sapang Baho River, eventually emptying into the Manggahan Floodway and Laguna de Bay.
Along with the San Juan River, the two rivers act as natural drainage systems by receiving and conveying Calamba's (and Cabuyao's for San Cristobal) liquid wastes and storm surface runoff to the nearby Laguna de Bay. Both rivers are very polluted as a result, thus, affecting the water quality of the lake as well.
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.