San Juan River (Calamba)

Infobox_River
river_name = San Juan River


image_size =
caption =
origin =
mouth = Southern part of Laguna de Bay
basin_countries = Philippines
length =
elevation =
mouth_elevation = less than 2 meters above sea level
discharge =
watershed = The "San Juan River" (Tagalog: "Ilog ng San Juan") is a river system in Calamba City, 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.

Along with the San Cristobal River, it is one of the two major rivers that are the principal means by which Calamba's water drains into Laguna de Bay.Citation | last = | first = | author-link =Local Water Utilities Administration, Republic of the Philippines | last2 = | first2 = | author2-link = | title = World Bank Environmental Assessment Report: Calamba, Laguna | date =August 1997 | year =1997 | url =http://www-wds.worldbank.org/servlet/WDSContentServer/WDSP/IB/1999/08/15/000009265_3971201161307/Rendered/INDEX/multi_page.txt | accessdate=2007-09-30] Its watershed area covers Calamba City in Laguna and the municipalities of Santo Tomas, Tanauan, and Malvar in Batangas. [Citation | last= | first= | author-link=Green Army Philippines Network Foundation, Inc. | last2= | first2= | author2-link=Forest Management Bureau, Department of Environment and Natural Resources, Republic of the Philippines | title=Final List of Watersheds Supporting 140 River Irrigation System of the NIA | date=2006 | year=2006 | url=http://greenarmynetwork.net/files/docs/watersheds-supporting-irrigation-systems.pdf. | accessdate=2007-09-30]

Monitoring and Conservation

In the latest (December 2005) Water Quality Status Report listed on the LLDA's site, the San Juan River was listed as "worse than Class D" with very low % Dissolved Oxygen saturation. It also indicated that this status had been "maintained" since the river was last monitored.

According to the Department of Environment and Natural Resources's Water Usage & Classification for Fresh Water, Class D Quality 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. [cite conference | first =Leonardo | last =Leonardo | authorlink =Leonardo Liongson | title =Data Monitoring and Needs | booktitle =Proceedings of the Workshop/Discussions on Integrated Manila Bay/Laguna Lake System and Surrounding Watersheds | pages =120 | publisher =Japan Society for the Promotion of Science | date =November 23-24, 2000 | location =Hotel Rembrandt, Quezon City | url =http://www.wv.mei.titech.ac.jp/IMSWES/Papers/IMSWES2000Rev01.pdf | doi = | id = | accessdate=2007-09-30]

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 conservation of the San Juan. [Citation | last =Cariño | first =Jose III | author-link =Jose Cariño III | title =Integrated Water Resources Management: The Laguna de Bay Experience | date = | year =2007 | url =www.adb.org/Water/narbo/2007/llda-peer-review/IWRM-Carino.pdf | accessdate =2007-09-30]

Sources

ee also

* Laguna de Bay
* Laguna Lake Development Authority