Water Quality
A detailed study of the physico-chemical and bio-chemical parameters of the lake waters carried out in the period 1981-2001 confirmed the deteriorating status of the lake necessitating action for restoration. There was a high percentage of chemicals but low percentage of total plankton (43%). The activity of chemicals lead to the liberation of extra quantity of cellular products which increased to 53.19%. Lake indicated high productivity of bio-chemical products; with death and decay of algal blooms adding to the biochemical concentration. The lake waters showed high electrolytes, low dissolved oxygen, high phosphate and nitrogen content with abundance of plankton blooms, all of which have contributed to a high degree of eutrophication. The non potability of the water body is indicated by the high degree of faecal contamination with organisms that produce H2S that may include forms of Salmonella, Proteus, Citrobacter and some strains of Klebsiella. The distribution pattern of plank tonic forms, for the decade ending 2001, as per laboratory tests of lake’s water samples provides the values of parameters such as the Chlorococcales, Desmids, Diatoms, Blue-greens and Euglenoids, as the biological indicators of water body, as given in table below which testify to the lake’s eutrophication status. The numbers indicate the microorganisms present in the sample per litre.
| Parameters | Kukkarahalli
Lake |
||
|---|---|---|---|
| Year / Group | 1981 | 1991 | 2001 |
| Chlorococcales | 353251 | 542210 | 438342 |
| Desmids | 150 | Nil | 7 |
| Diatoms | 5822 | 5132 | 6173 |
| Blue-greens | 24325 | 23420 | 20719 |
| Euglenoids | 8321 | 3251 | 6577 |
| Dinoflagellates | 210 | 622 | 174 |
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