Articles by Shubha Ramachandran

One of the characteristic features of a lake is its colour.  You may have noticed that the water in many lakes in Bengaluru is green, and not blue, as you might have imagined it to be. This is due to the presence of algae. Algae are microscopic plants that contain chlorophyll which is the pigment that gives it a green colour. While some amount of algae is healthy for the lake ecosystem, excess algae can be harmful and is an indicator of a polluted and nutrient-rich lake. Lakes rich in nutrients such as nitrogen and phosphorus are called eutrophic lakes,…

Due to rapid urbanisation and unplanned development, Bengaluru’s groundwater is getting increasingly contaminated. This issue requires urgent attention as approximately 40% of the city's population depend on groundwater (borewells, open wells and tankers) for their daily water needs such as drinking, cooking and bathing.  Contaminated groundwater could lead to health issues if it is directly consumed. If used for agricultural purposes, it could even enter the food chain.  Residents across the city have reported that borewells discharge coloured or smelly water. This indicates percolation of sewage and chemicals into the water table. Discolouration, cloudiness and bad odour are some of…

Traditionally, Bengaluru’s lakes stay dry for a couple of months, and fill up during the monsoons. This made it easier for potters, brick makers and farmers to collect silt from lakes. But due to climate change, rapid urbanisation and unplanned development, more lakes have been drying up for longer periods of time. An article by Times of India states that “According to BBMP, about 50% of the lakes have water less than half of their holding capacity. Some of them have gone dry and in others, the water level is fast depleting”. Sowl Kere, Kannamangala lake, Arakere, Sarakki, and Yelahanka…

Bengaluru, once known as the 'City of Lakes', has made national and international headlines as the 'City of Burning Lakes'. Lakes in Bengaluru have caught fire several times - mostly at Bellandur lake, but also in other parts of the city. The fire burns for hours, polluting the air with smoke and creating a public health hazard. Bellandur Lake, the city’s largest lake, has burst into flames many times in the recent past. The first instance was in May 2015, and then again in August 2016, February 2017, and January 2018. The 2018 fire lasted 30 hours, with smoke engulfing…

Bengaluru’s lakes have been in the news for pollution, froth, fish kill and even fire. Despite the government investing crores of rupees into reviving these lakes, and widespread citizen engagement, not much has changed. While the main reason is the lack of coordination between government departments, the absolute lack of science-based solutions is also a major gap. In this context, Ashoka Trust for Research in Ecology and the Environment (ATREE) and Biome Environmental Trust (BIOME) have developed the ‘Bangalore Citizen Science Lakes Dashboard’ to share knowledge and best practices for better management of lakes. We created a series of system…

Our preferred imagination of an urban lake is mostly blue water with a well-maintained walking track all along, some trees on the periphery and some birds on them. That imagination is of course broken when the lake stinks, froths, has plastic strewn around. And when we see overgrown typha reeds in the lake, floating hyacinth and alligator weed, when the lake turns from blue to green, that imagination is broken. And then we want to rejuvenate the lake and turn it blue again. Lower Ambalipura lake / wetland If we were to step back and think why is it that…

Most borewells along Sarjapura Road do not yield much water. A new apartment opposite Kaikondrahalli Kere is also struggling for water as their borewells run dry. The builder decides to revive an old  open well in his property. The well is  18ft in diameter and 40ft deep and has been fully closed with mud. Pedanna the well digger is called in. Alongwith his team Pedanna excavates all the 40ft of mud manually. They strike water at about 20ft below ground level. The water has to be pumped out as they continue to dig. The well is now completely excavated and…

See the map to Identify the 4 major reservoirs in Karnataka : Hemavathy, Harangi, KRS and Kabini. Inflows and Outflows to all 4 reservoirs are monitored and known and this forms the basis of all calculations The river flows into TN and at Biligundlu there is a measuring station that tells you how much water flows into TN from Karnataka The water that flows into the river downstream of KRS and Kabini is measured at Biligundlu, is expected to flow in from about 22,000 sqm and in an average year can contribute about 80TMC. About 740TMC is the total water…

A question we often get asked as rainwater harvesters is, is there any point in building a recharge structure adjacent to a lake ? Does the lake not recharge ground water ? Will the recharge structure/well make any difference ? This is a very pertinent question and I can write on what we have seen from experience Very often you do see old open wells adjacent to lakes. The well used to be the place from where people drew the water for use. The water level in the lake and the water level in the well would more or less…

Having worked with, seen and spoken to numerous borewell owners, it is apparent that the borewells that yield well; say about more than 60,000 litres of water per day (that are used by layouts, tanker operators, industries etc) are those that are shallower than 800ft. Its not the 1000+ft borewells that yield copious amounts of water. Even if it is a 1000+ft borewell that is yielding a lot of water, a camera inspection will reveal that actually its the shallower cracks that yield more water. Take a look at the attached picture to somewhat make sense of Bangalore's geology and…