Hi Dillip; I have viewed some ...

Hi Dillip; I have viewed some of the responses that were provided previously and agree that there may be blue green algae in the pond (its actaully not a lake) and that is generally caused by high nutrient loading and high temperature. The water body looks fairly shallow based on the amount of emergent growth of what looks like a Canary Reed Grass. I agree with the assessment of a submerged aquatic that looks like a Fan Wort which typically is found in alkaline types of water. If I am not mistaken theer appears to be a stepped structure that was built into the pond at some time in the past and the banks appear to be built up so I have to ask if this is an impoundment and if so is there an outlet with flow from it? In the foreground there appears to be a road that runs beside the pond and debris and sediments from that would undoubtedly enter the pond and may be a source of some pollutants. It is important to gather information on the surrounding land use as well as the water quality before even looking at a chemical solution to a presumed algal problem. I have seen several of these types of old impoundments in Rajasthan usually at old temple sites that at first glance look polluted but which in fact suffer from a lack of flow through and the entry of human debris and wastes from the surrounding land use which when cleaned up improved the quality of the water system. In many cases the incoming water was of reasonable quality.