"Urban Lake Degradation Demands Outcome-Oriented Rejuvenation Beyond Quick Fixes"
Eutrophication
nutrient overloading of a waterbody causing algal blooms, oxygen depletion, and ecological collapse
Ramsar Convention
international treaty (1971) for the conservation and wise use of wetlands of international importance
India's urban and peri-urban lakes have historically served as critical nodes in local hydrological cycles. They provide flood buffering, groundwater recharge, potable water storage, and ecological habitat. Wetlands, including urban lakes, cover nearly 6% of the planet's surface and are among the most productive ecosystems on Earth. They store a disproportionately large share of the world's carbon, often outperforming terrestrial forests per unit area in carbon sequestration.
The domestic legal framework for protecting these waterbodies rests on the Environment (Protection) Act, 1986 and the Wildlife (Protection) Act, 1972. India's obligations under the Ramsar Convention on Wetlands further commit it to the wise use and conservation of designated wetlands of international importance. Despite this framework, implementation has remained fragmented. Responsibility is split across urban local bodies, state pollution control boards, irrigation departments, and forest departments. No single agency owns the full lifecycle of a lake's health. Past restoration efforts have been ad hoc, driven by political cycles, focused on visible outputs like embankment construction or desilting, and disconnected from measurable ecological outcomes.
Peninsular India's tropical shallow lakes face a distinctive set of pressures. These waterbodies have a maximum depth of roughly six metres, allowing light to penetrate to the bottom. This makes them highly productive but also highly vulnerable to eutrophication, nutrient overloading from domestic sewage and agricultural runoff. The absence of vertical thermal stratification means pollutants and nutrients mix throughout the water column, accelerating ecological degradation. Many urban lakes are today either biologically dead or heavily eutrophic.
The core problem with conventional restoration is the gap between outputs and outcomes. Desilting a lake or constructing an embankment is a visible, politically rewarding output. But it does not restore the lake's functional capacity, its ability to perform flood mitigation, groundwater recharge, biodiversity support, and carbon storage. …
"If rainforests and tropical forests are the lungs of the Earth, then surely wetlands function as its kidneys." Which one of the following functions of wetlands best reflects the above statement?
'R2 Code of Practices' constitutes a tool available for promoting the adoption of
The world is facing an acute shortage of clean and safe freshwater. What are the alternative technologies which can solve this crisis? Briefly discuss any three such technologies citing their key merits and demerits.
Consider the following statements regarding wetlands and urban lakes:
1.Wetlands cover approximately 6% of the planet's surface.
2.Tropical shallow lakes in peninsular India typically have a maximum depth of about six metres, making them susceptible to eutrophication.
3.Unlike deep stratified lakes, shallow tropical lakes have vertical thermal stratification that prevents pollutants from mixing throughout the water column.
4.Wetlands store less carbon per unit area than terrestrial forests.
How many of the above statements are correct?
Which one of the following functions of wetlands best reflects the description of wetlands as the 'kidneys of the Earth'?
Match the following lake restoration concepts with their correct descriptions:
List I (Concept) — List II (Description)
A.Eutrophication — 1. Legally demarcated maximum water level of a lake defining its boundary
B.Full Tank Level (FTL) — 2. Managing a lake's health by addressing the entire upstream catchment, not just the waterbody
C.Watershed-level planning — 3. Nutrient overloading from sewage/runoff causing algal blooms and oxygen depletion
D.Functional capacity — 4. A lake's ability to perform flood mitigation, groundwater recharge, and biodiversity support
Select the correct answer using the code given below:
Consider the following statements regarding India's legal and policy framework for wetland and urban lake conservation:
1.The Environment (Protection) Act, 1986 provides the overarching domestic legal framework for environmental protection including wetlands.
2.India is a signatory to the Ramsar Convention on Wetlands, which mandates the wise use and conservation of wetlands of international importance.
3.AMRUT 2.0 (Atal Mission for Rejuvenation and Urban Transformation) includes urban water body rejuvenation as one of its components.
4.The Ramsar Convention designates all urban lakes in India as wetlands of international importance.
Which of the statements given above are correct?
With reference to the five-stage Framework for Lake Rejuvenation developed for urban freshwater lakes in India, consider the following statements:
1.The framework targets freshwater lakes up to six metres deep in densely populated urban settings.
2.It explicitly includes industrially-polluted lakes as a priority category for restoration.
3.The framework replaces binary water quality classifications with a continuous water quality scale.
4.Mandatory community visioning is required before project commencement under the framework.
How many of the above statements are correct?
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