The San Juan River ( tl, Ilog ng San Juan), also known as Calamba River, is a river system in

Calamba, Laguna Calamba, officially the City of Calamba ( fil, Lungsod ng Calamba), is a 1st class Cities of the Philippines#Legal classification, component city in the Provinces of the Philippines, province of Laguna (province), Laguna, Philippines. According ...

Philippines The Philippines (; fil, Pilipinas, links=no), officially the Republic of the Philippines ( fil, Republika ng Pilipinas, links=no), * bik, Republika kan Filipinas * ceb, Republika sa Pilipinas * cbk, República de Filipinas * hil, Republ ...

. It is one of 21 major

tributaries A tributary, or affluent, is a stream or river that flows into a larger stream or main stem (or parent) river or a lake. A tributary does not flow directly into a sea or ocean. Tributaries and the main stem river drain the surrounding drain ...

Laguna de Bay Laguna de Bay ( Spanish for "Lagoon/Lake of Bay"; tl, Lawa ng Bay, ), also known as Laguna Lake, 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 ...

and is regularly monitored by the

Laguna Lake Development Authority The Laguna Lake Development Authority (LLDA), one of the attached agencies of the Department of Environment and Natural Resources (DENR), is responsible for the preservation, development, and sustainability of Laguna de Bay (Laguna Lake) and its ...

(LLDA) through one of its 15 river monitoring stations. Along with the

San Cristobal River The San Cristobal River ( tl, Ilog ng San Cristobal) commonly known as Matang Tubig River is a river system in the cities of Calamba and Cabuyao, Laguna, Philippines. The river is one of 21 major tributaries of Laguna de Bay. Hydrology The m ...

, it is one of the two major rivers of Calamba that drains into Laguna de Bay. Its watershed area covers Calamba City in Laguna and the municipalities of

Santo Tomas Santo Tomás is Spanish for Saint Thomas. Santo Tomas may also refer to: Places Argentina * Santo Tomás, Buenos Aires, Carlos Casares Partido, Buenos Aires Province * Santo Tomás, Neuquén Colombia * Santo Tomás, Atlantico Cuba ...

, Tanauan, and

Malvar Malvar, officially the Municipality of Malvar ( tgl, Bayan ng Malvar), is a 2nd class municipality in the province of Batangas, Philippines. The municipality was named after General Miguel Malvar, one of the last Filipino generals to surrend ...

Batangas Batangas, officially the Province of Batangas ( tl, Lalawigan ng Batangas ), is a province in the Philippines located in the Calabarzon region on Luzon. Its capital is the city of Batangas, and is bordered by the provinces of Cavite and L ...

Monitoring and conservation

In the December 2005 LLDA Water Quality Status Report, the San Juan River was listed as "''worse than Class D''" with a very low percentage of

dissolved oxygen Oxygen saturation (symbol SO2) is a relative measure of the concentration of oxygen that is dissolved or carried in a given medium as a proportion of the maximal concentration that can be dissolved in that medium at the given temperature. It ca ...

saturation. It also indicated that this status had not improved since the river had last been monitored. According to the

Department of Environment and Natural Resources The Department of Environment and Natural Resources ( fil, Kagawaran ng Kapaligiran at Likas na Yaman, DENR or KKLY) is the executive department of the Philippine government responsible for governing and supervising the exploration, developmen ...

's Water Usage & Classification for Fresh Water, Class D freshwater is suitable for agriculture, irrigation, livestock watering and industrial water supply class II. "''Worse than Class D''" means that the San Juan is not usable for any of these functions. The LLDA's conservation efforts for the major tributaries and watersheds of Laguna de Bay have led to the creation of the Laguna de Bay River Basin Councils, of which the MTSC-San Juan River Protection Fdn., Inc. is particularly tasked with the conservation of the San Juan.

References

Rivers of the Philippines Tributaries of Laguna de Bay Calamba, Laguna Landforms of Laguna (province) {{Philippines-river-stub

Monitoring and conservation

See also

References