Chlorophyll a was measure dby the method of
ISO 10260. Turbidity was measured with a turbidity
meter. Water quality was evaluated from the main
parameters (DO, BOD, conductivity, nitrate nitrogen,
ammonium nitrogen, soluble reactive phosphorus and
chlorophyll a) according to Lorrain and Vollen weider
(1981),Wetzel (1983)and Peerapornpisal et al. (2004).