Lake Features
Bunot Lake has a
surface area of 30.5 hectares (305,000 sq. m.) with
a maximum depth of 23 meters. It is circular in
shape. It is 4.5 km away from the city proper.
As of July 2006, there
are 183 fish pen and fish cage operators occupying
an area of 93,433 sq. m. equivalent to 30.6 % of the
lake area.
Water Quality
Monitoring Program
The Laguna Lake
Development Authority (LLDA), by virtue of RA 4850,
as amended, has the primary responsibility to
promote the development of the Laguna de Bay region,
while providing for environmental management and
control, preservation of the quality of life and
ecological systems, and the prevention of undue
ecological disturbance, deterioration and pollution.
The LLDA has been
conducting regular water quality monitoring with the
following objectives:
-
To accurately
assess the suitability of the lake for all its
present and intended beneficial uses;
-
To evaluate the
impacts of development activities on the lake’s
water quality that will serve as important
criteria for environmental planning and
management.
Routine monitoring
programs conducted by LLDA include the Laguna de Bay
and its tributaries as well as the Seven Lakes of
San Pablo City and Tadlac Lake in Los Banos.
One water quality
monitoring station was established for Bunot Lake.
During the conduct of the sampling activity, water
temperature and dissolved oxygen concentration are
measured at the surface and at 2,3,4,5,6,10,15, and
20 meters depth. A gallon of composite water from
surface to 5-meter depth is also collected for
chemical analysis. The chemical parameters analyzed
at the laboratory include pH, total suspended
solids (TSS), total dissolved solids (TDS),
turbidity, chloride, nitrate, ammonia, inorganic
phosphate, biochemical oxygen demand (BOD) and
chemical oxygen demand (COD). Zooplankton sample is
collected by passing five pails of surface lakewater
through a 35-micron meshsized plankton net.
Zooplankton sample is preserved in a 10% formalin
solution. On the other hand, phytoplankton sample is
taken from a gallon of composite sample, placed in
small plastic container and preserved with
Lugol’s solution. Water transparency is likewise
measured and all the physical observations including
weather condition are noted and recorded.
At present, monitoring
is conducted during the first (January, February,
March) and last quarters (October, November and
December) and in June and September.
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