Laguna de Bay ( fil|Lawa ng Laguna ; en|Lake of Laguna) or Laguna Bay (incorrectly called "Laguna lake") is the largest lake
in the Philippines
. It is located southeast of Metro Manila
, between the provinces
to the south and Rizal
to the north. A freshwater
lake, it has a surface area of 911–949 km² (352–366 sq mi), with an average depth of about and an elevation of about above sea level. The lake is shaped like a crow's foot, with two peninsula
s jutting out from the northern shore. Between these peninsulas, the middle lobe fills the large volcanic Laguna Caldera
. In the middle of the lake is the large island of Talim
, which falls under the jurisdiction of the towns of Binangonan
in Rizal province
The lake is one of the primary sources of freshwater fish in the country. Its water drains to Manila Bay
via the Pasig River
thumb|left|The Laguna de Bay surrounded by the province of Laguna and Rizal and Metro Manila on the north-west; the town of Bay highlighted.
Laguna de Bay means "Lagoon of he town of
Bay" for the lakeshore town of Bay
(pronounced as "Bä'ï"), the former provincial capital of Laguna
Alternate spellings of the town's name include "Bae" or "Ba-i", and in the early colonial times, "Bayi" or "Vahi". Thus, the lake is sometimes spelled as "Laguna de Bae" or "Laguna de Ba-i", mostly by the locals.
The town's name is believed to have come from the Tagalog
word for "settlement" (''bahayan''), and is related to the words for "house" (''bahay''), "shore" (''baybayin''), and "boundary" (''baybay''), among others. The introduction of the English language
during the American occupation of the Philippines
, elicited confusion as the English word "bay
", referring to another body of water, was mistakenly substituted to the town name that led to its mispronunciation.
However, the word "Bay" in Laguna de Bay has always referred to the town.
word ''Laguna'' refers to not just lagoon
s but also for freshwater lake
s, aside from ''lago''. Some examples of the worldwide usage of ''laguna'' for lakes include Laguna Chicabal
, Laguna de Gallocanta
, Laguna Catemaco
and Laguna de Leche
, the largest lake in Cuba
. The lake's alternate name, "Laguna Lake", refers to the Province of Laguna, the province at the southern shore of the lake. Laguna province, though, was named because of the large lake and was originally called ''La Laguna'' till the early 20th century.
In the pre-Hispanic era, the lake was known as "Puliran Kasumuran" (''Laguna Copperplate Inscription
'', 900 AD), and later by "Pulilan" (''Vocabulario de la lengua tagala
'', 1613. Pila, Laguna
Currently, the lake is often incorrectly called "Laguna Bay," including in government websites, or "Laguna Lake" which is used by the Laguna Lake Development Authority
The middle part of Laguna de Bay between Mount Sembrano
and Talim Island
, is the Laguna Caldera
believed to have been formed by two major volcanic eruptions, around 1 million and 27,000–29,000 years ago. Remnants of its volcanic history are shown by the presence of series of maar
s around the area of Tadlac Lake
and Mayondon hill in Los Baños, Laguna
, another maar at the southern end of Talim Island
, and a solfataric
field in Jala Jala.
Laguna de Bay is a large shallow freshwater body in the heart of Luzon Island
with an aggregate area of about and a shoreline of .
[ It is considered to be the third largest inland body of water in Southeast Asia after Tonle Sap in Cambodia and Lake Toba in Sumatra, Indonesia. Laguna de Bay is bordered by the province of Laguna in the east, west and southwest, the province of Rizal in the north to northeast, and Metropolitan Manila in the northwest. The lake has an average depth of and its excess water is discharged through the Pasig River.] [Gonzales, E. (1987). "A socio economics geography (1961–85) of the Laguna lake resources and its implications to aquatic resources management and development of the Philippine islands" Dissertation. Cambridge University, England, United Kingdom] [Guerrero, R. & Calpe, A. T. (1998). "Water resources management : A global priority". National Academy of Science and Technology, Manila, Philippines]
The lake is fed by of catchment areas and its 21 major tributaries. Among these are the Pagsanjan River which is the source of 35% of the Lake's water, the Santa Cruz River which is the source of 15% of the Lake's water, the Marikina River (through the Manggahan Floodway), the Mangangate River, the Tunasan River, the San Pedro River, the Cabuyao River, the San Cristobal River, the San Juan River, the Bay, Calo and Maitem rivers in Bay, the Molawin, Dampalit and Pele rivers in Los Baños, the Pangil River, the Tanay River, the Morong River, the Siniloan River and the Sapang Baho River. [LLDA 1995, p. 4.]
The lake is a multipurpose resource. In order to reduce the flooding in Manila along the Pasig River, during heavy rains, the peak water flows of the Marikina River are diverted via the Manggahan Floodway to Laguna de Bay, which serves as a temporary reservoir. In case the water level on the lake is higher than the Marikina River, the flow on the floodway is reversed, both Marikina River and the lake drain through Pasig River to Manila Bay.
The lake has been used as a navigation lane for passenger boats since the Spanish colonial era. It is also used as a source of water for the Kalayaan Pumped-Storage Hydroelectric Project in Kalayaan, Laguna. Other uses include fishery, aquaculture, recreation, food support for the growing duck industry, irrigation and a "virtual" cistern for domestic, agricultural, and industrial effluents.
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. This important water resource has been greatly affected by development pressures like population growth, rapid industrialization, and resources allocation. [Batu, M. (1996) Factors affecting productivity of selected inland bodies of water in the Philippines: The case of the Laguna Lake 1986 to 1996. Undergraduate thesis. San Beda College, Manila.]
Known lake islands include Talim, the largest and most populated island on the lake; [U.S. Army corps of Engineers (1954)] Calamba Island, which is completely occupied by the Wonder Island resort in Calamba, Laguna;
"Manila (topographical map)"
University of Texas in Austin Library. Retrieved on 2014-08-03.
Cielito Lindo, a privately owned island off the coast of mainland Cardona, Rizal; Malahi Island which used to be the site of Maligi Island military reservation, near the southern tip of Talim; the nearby islands of Bonga and Pihan, also in Cardona; and Bay Island off the coast of Bay, Laguna, which is closely associated with the precolonial crocodile-deity myths of that town.
At least 18 fish species are known from Laguna de Bay; none are strictly endemic to the lake, but 3 are endemic to the Philippines: ''Gobiopterus lacustris'', ''Leiopotherapon plumbeus'' and ''Zenarchopterus philippinus''. Aquaculture is widespread in Laguna de Bay, but often involves non-native species. Some of these have escaped and have become invasive species, representing a threat to the native fish.
Because of the problems facing and threatening the potential of the lake, then President Ferdinand Marcos signed into law Republic Act (RA) 4850 in 1966 creating the Laguna Lake Development Authority (LLDA), the main agency tasked to oversee the programs that aimed to develop and protect Laguna de Bay. Though it started as a mere quasi-government agency with regulatory and proprietary functions, its charter was strengthened by Presidential Decree (PD) 817 in 1975 and by Executive Order (EO) 927 in 1983 to include environmental protection and jurisdiction over the surface waters of the lake basin. In 1993, by virtue of the devolution, the administrative supervision of the LLDA was transferred to the DENR by EO 149.
Government data showed that about 60% of the estimated 8.4 million people residing in the Laguna de Bay Region discharge their solid and liquid wastes indirectly to the lake through its tributaries. A large percentage of these wastes are mainly agricultural while the rest are either domestic or industrial According to DENR (1997), domestic and industrial wastes contribute almost equally at 30% each. Meanwhile, agricultural wastes take up the remaining 40%. In a recent sensitivity waste load model ran by the Laguna Lake Development Authority's (LLDA) Integrated Water Resources Management (IWRM) division, it revealed that 70% of biochemical oxygen demand (BOD) loadings came from households, 19% from industries, and 11% came from land run-off or erosion (LLDA, 2005).
As far as industries and factories are concerned, there are about 1,481 and increase is expected.
Of the said figure, about 695 have wastewater treatment facilities. Despite this, the lake is absorbing huge amounts of pollution from these industries in the forms of discharges of industrial cooling water, toxic spills from barges and transport operations, and hazardous chemicals like lead, mercury, aluminum and cyanide. Based from the said figure, 65% are classified as “pollutive” industries.
The hastened agricultural modernization throughout the region took its toll on the lake. This paved the way for massive and intensified use of chemical based fertilizers and pesticides whose residues eventually find their way to the lake basin. These chemicals induce rapid algal growth in the area that depleted oxygen levels in the water. Hence, oxygen available to the lake is being used up thereby depleting the available oxygen for the fish, causing massive fish kills. [Solidarity for People’s Power (1992) Laguna de bay: Racing against time. Pamphlet article. Los Baños, Laguna, Philippines.]
As far as domestic wastes are concerned, around 10% of the 4,100 metric tons of waste generated by residents of Metro Manila are dumped into the lake, causing siltation of the lake. As reported by the now defunct Metropolitan Manila Waterworks and Sewerage System (MWSS), only 15% of the residents in the area have an effective waste disposal system. Moreover, around 85% of the families living along the shoreline do not have toilets and/or septic tanks.
On January 29, 2008, the Mamamayan Para sa Pagpapanatili ng Pagpapaunlad ng Lawa ng Laguna (Mapagpala) accused the Laguna Lake Development Authority (LLDA) of the deterioration of Laguna de Bay due to multiplication of fish pens beyond the allowable limit.
Laguna Lakeshore Expressway Dike
right|thumb|Laguna Lakeshore Expressway Dike
The Laguna Lakeshore Expressway Dike is a proposed expressway that will start from the coastal area of Laguna de Bay from Taguig in Metro Manila to Calamba and Los Baños in Laguna.The project aims to provide a high-standard highway that will speed up traffic between the southern part of Metro Manila and Laguna, as well as a dike that would mitigate flooding in the western coastal communities along Laguna Lake.
Protection and conservation
According to the Clean Water Act of 2004, the DENR (through the LLDA) shall implement a wastewater charge system in all management areas including the Laguna Lake region and Regional Industrial Centers through the collection of wastewater charges/fees. The system shall be established on the basis of payment to the government for discharging wastewater into the water bodies. Wastewater charges shall be established taking into consideration the following: a) to provide strong economic inducement for polluters to modify their production or management processes or to invest in pollution control technology in order to reduce the amount of water pollutants generated; b) to cover the cost of administering water quality management or improvement programs, including the cost of administering the discharge permitting and water pollution charge system; c) reflect damages caused by water pollution on the surrounding environment, including the cost of rehabilitation; d) type of pollutant; e) classification of the receiving water body; and f) other special attributes of the water body.
The technical aspect regarding the quality of wastewater is given in DENR Administrative Order 1990–35. The order defines the critical water parameters’ value versus the classification of the body of water (e.g., lake or river). Discharge permits are issued by the LLDA only if the wastewater being discharged complied with the said order.
Integrated Coastal Ecosystem Conservation and Adaptive Management
CECAM is a 5-year research cooperation between Japanese and Filipino scientists. Seven monitoring instruments are being used as part of the Continuous and Comprehensive Monitoring System (CCMS) provided by the Japanese government.
Laguna de Bay has had a significant impact on the cultures of the communities that grew up around its shores, ranging from folk medicine to architecture. For example, the traditional cure for a child constantly experiencing nose bleed in Victoria, Laguna is to have the child submerge his or her head in the lake water at daybreak. When nipa huts were more common, huts made in the lake area were constructed out of bamboo that would first be cured in the waters of Laguna de Bay. Some experts on the evolution of local mythologies suggest that the legend of Mariang Makiling may have started out as that of the Lady (Ba'i) of Laguna de Bay, before the legend was transmuted to Mount Makiling.
*Laguna Lake Development Authority
*Laguna Lakeshore Expressway Dike
*Rehabilitation of the Pasig River
*Laguna Lake Development Authority, LLDA (2009)
"2009 Annual Report"
*Laguna Lake Development Authority, LLDA (1995)
"Laguna de Bay Master Plan – Final Report"
*Canonoy, F. V. (1997)
*Laguna Lake Development Authority
*McKitrick, R. (1999)
A derivation of the marginal abatement cost curve.
*National Statistical Coordination Board (1996)
Estimation of fish biomass in Laguna de Bay based on primary productivity.
Laguna Lake Development Authority
Department of Environment and Natural Resources
Category:Geography of Luzon
Category:Calderas of Asia