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Water quality trends of the Rinconada lake system and the implications in lake management

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Date
2013
Author
Palma, Adelaida L.
Page views
3,631
Subject
water quality ASFA
lakes ASFA
water quality control ASFA
sampling ASFA
parameters ASFA
stocking density ASFA
feeding ASFA
dissolved oxygen ASFA
water temperature ASFA
water transparency ASFA
water samplers ASFA
water samples ASFA
water sampling ASFA
ammonia ASFA
nitrites ASFA
alkalinity ASFA
pH ASFA
colorimetry ASFA
Bato, Lake TGN
Buhi, Lake TGN
Camarines Sur TGN
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Abstract
Monitoring of important water quality parameters were conducted in the Rinconada Lake System in Camarines Sur composed of Lake Bato (3,800 ha), Lake Buhi (1,800 ha), and Lake Baao-Bula (400 ha). Monthly samplings were conducted in 14 stations in Lakes Bato and Buhi and in ten stations in Lake Baao-Bula.

For Lake Bato, dissolved oxygen at the surface is within the optimum range of 6.3 mg/L-10.47 mg/L for the wet seasons and 5.7 mg/L - 9 mg/L for the dry seasons but drops drastically at the bottom during the dry season. Critically low mean average of 0.71 mg/L prevailed in the diurnal oxygen trend. High levels of ammonia were recorded in particularly in Station 1 (0.81 mg/l), Station 2 (0.8125 mg/l), and Station 10 (0.8825 mg/l).

The mean values of the water quality parameters of Lake Buhi from the surface to a depth of 4 m are within the optimum level. However, critically low dissolved oxygen and high levels of ammonia were recorded at the bottom, indicating the build up of anoxic layer. The Lake is stratified in most months of the year with a gradient difference of 1.74°C during the wet season and 2.15°C in the dry season.

Dissolved oxygen, temperature and pH of Lake Baao-Bula is generally within the optimum levels with slight fluctuation in alkalinity. Nitrite (0.7 mg/l) and ammonia (1.5 mg/l) were critically high during the wet season.

Results of the water quality monitoring provided management recommendations in establishing aquaculture zones, redesigning of cages and the use of the lakes for aquaculture and fisheries.
URI
http://hdl.handle.net/10862/5844
Suggested Citation
Palma, A. L. (2013). Water quality trends of the Rinconada lake system and the implications in lake management. In M. L. C. Aralar, A. S. Borja, A. L. Palma, M. M. Mendoza, P. C. Ocampo, E. V. Manalili, & L. C. Darvin (Eds.), LakeCon2011: Building on the pillars of Integrated Lake Basin Management (Second National Congress on Philippine Lakes) (pp. 48-62). Los Baños, Laguna, Philippines: PCAARRD-DOST.
Type
Conference paper
ISSN
1656-8099
Series
Summary of Proceedings No. 1/2013;
Collections
  • LakeCon2011 [30]

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