Study area

Chikkabettahalli Lake is located in Adityanagar, Vidyaranyapura ward of  Greater Bengaluru, Karnataka. Greater Bangalore (77°37’19.54’’ E and 12°59’09.76’’ N) enjoys a salubrious climate all year round with the summer temperature ranging from 18°C – 38°C and the winter temperature ranging from 12°C – 25°C (Ramachandra and Kumar, 2008). Figures 1.1 and 1.2  depict the status of lake during  2000 and 2014.

2000

Figure 1.1: Status of lake in 2000

2014

Figure 1: Status of lake in 2000 and 2014

Figure 2: Water Sampling sites

4.2 Water Quality Assessment
Analysis of physico-chemical parameters: Water samples  were collected  at inlet and outlet of the lake in November 2014. Water quality parameters analysed include water temperature, pH, electrical conductivity (EC) and dissolved oxygen (DO) which were determined on spot at the time of sampling. Other parameters like nitrate, orthophosphate, total alkalinity, calcium and magnesium hardness, total hardness, chlorides, COD (Chemical oxygen demand), sodium and potassium were analysed in the laboratory using standard protocol as per Trivedi and Goel (1986) and APHA (1998).
Qualitative and quantitative analysis of phytoplankton: The qualitative and quantitative analysis of phytoplankton is done by Lackey's drop method. The algal species were identified based on their key morphological features, according to Prescott (1954), Desikacharya (1959).   
Macrophyte collection and identification: Macrophyte samples were collected and washed to get rid of adhering materials. They were identified using Cook CDK (1996).

Figure 3: Threats faced by Chikkabettahalli Lake