During the dry season, biochemical oxygen demand was nearly completely expressed after 30d of incubation whereas during the rainy season BOD was about 65% expressed after 31 d of incubation and the correlation between BOD and UBOD was less strong compared to the dry season. water quality varibles were correlated with measures of BOD during rainy and dry seasons, but onty the correlation between chlorophyll a and BOD measures was predictive.