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Because of its importance in the development of the Laguna de Bay Region, unlike other lakes in the country, its water quality and general condition are closely monitored. [20] This important water resource has been greatly affected by development pressures like population growth, rapid industrialization , and resources allocation.
The Santa Cruz River (Tagalog: Ilog ng Santa Cruz) is a river system in Santa Cruz, Laguna, on the island of Luzon, in the Philippines. It is one of 21 tributaries of Laguna de Bay, contributing about 15% of the total water in the lake.
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 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 ...
LLDA (1996) Water quality report on the Laguna de Bay and its tributary rivers. LLDA (1997) Water quality report on the Laguna de Bay and its tributary rivers. LLDA (1998) Water quality report on the Laguna de Bay and its tributary rivers. LLDA (1999) Water quality report on the Laguna de Bay and its tributary rivers.
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. [1]
Studies in Laguna de Bay from 1961 showed its productivity was decreasing. Towards the end of the decade, while overall value increased, this was due to an increase in fish pens. Capture fisheries decreased in productivity, with a small increase in shrimp capture being overshadowed with significant decreases in fish and snail capture.
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]