Wetlands — Environmental Law Notes

Wetlands

When a city floods, people blame the rain. Often the real culprit is a wetland that was quietly filled in for a shopping mall — because a wetland is nature’s own sponge and drain. Ecologists call wetlands the “kidneys of the landscape”: like kidneys, they filter and cleanse water, and like kidneys, you do not notice their work until they are gone.

What is a wetland?

A wetland is an area of land that is saturated or covered with water, either permanently or seasonally — the transition zone between dry land and open water. Marshes, swamps, mangroves, lakes, ponds, lagoons, estuaries and floodplains are all wetlands. The classic legal definition is from the Ramsar Convention.

Article 1.1, Ramsar Convention on Wetlands, 1971: “wetlands are areas of marsh, fen, peatland or water, whether natural or artificial, permanent or temporary, with water that is static or flowing, fresh, brackish or salt, including areas of marine water the depth of which at low tide does not exceed six metres.”

In Simple Terms: A wetland is anywhere land and water meet and mix — soggy ground, a marsh, a shallow lake, a mangrove coast. It need not be natural or permanent; even a seasonal marsh or a man-made pond counts.

Why wetlands matter — their functions. Give three or four in the note:

1. Flood control — they absorb and slow flood waters like a sponge.
2. Groundwater recharge and water supply — they let water seep down to refill aquifers and wells.
3. Water purification — they trap sediment and filter out pollutants, cleaning the water that passes through.
4. Habitat and biodiversity — they are among the richest ecosystems on earth, home to fish, migratory birds and countless plants; they also support fishing livelihoods and store carbon.

The legal framework. Wetlands are protected internationally by the Ramsar Convention, 1971 (the Convention on Wetlands of International Importance, signed at Ramsar, Iran), under which countries designate important wetlands as “Ramsar sites”. India joined in 1982 and has designated many sites — for example Chilika Lake (Odisha), Keoladeo National Park (Bharatpur, Rajasthan), Loktak Lake (Manipur) and Wular Lake (Jammu & Kashmir). Domestically, India protects them through the Wetlands (Conservation and Management) Rules, 2017 (which replaced the 2010 Rules), restricting activities that damage notified wetlands. Their main threats are drainage, encroachment for construction, and pollution.

🧩 WORKED EXAMPLE — the cost of filling a wetland

Facts. A developer fills a shallow lake — a designated Ramsar site that recharged the city’s wells and hosted migratory birds — to build apartments.

Rule. A wetland (Ramsar Art. 1.1) performs flood control, groundwater recharge, water purification and biodiversity functions; notified wetlands are protected under the Wetlands (Conservation and Management) Rules, 2017.

Apply. Filling it removes flood control (the city now floods), groundwater recharge (wells run dry) and habitat (the birds leave); and because it is a notified Ramsar site, filling it breaches the 2017 Rules.

Conclusion. The “empty” lake was doing several irreplaceable jobs at once, and the law protects it precisely so a single construction project cannot destroy them all.

flowchart TD
    ROOT["Wetland<br/>(Ramsar Art. 1.1, 1971)"]:::root
    ROOT --> F["Functions"]:::leaf
    F --> F1["Flood control (sponge)"]:::leaf
    F --> F2["Groundwater recharge"]:::leaf
    F --> F3["Water purification (kidneys)"]:::leaf
    F --> F4["Habitat &amp; biodiversity"]:::leaf
    ROOT --> P["Protection"]:::leaf
    P --> P1["Ramsar Convention 1971<br/>(Ramsar sites: Chilika, Keoladeo)"]:::leaf
    P --> P2["Wetlands (Conservation &amp;<br/>Management) Rules 2017"]:::leaf
    classDef root fill:#FFF8DC,stroke:#000,stroke-width:1px,color:#000;
    classDef leaf fill:#E6F3FF,stroke:#1E3A8A,color:#000;
    linkStyle default stroke:#888,stroke-width:1px;

Case Laws

• M.K. Balakrishnan vs Union of India (2017) — a public interest litigation in which the Supreme Court directed the Central and State Governments to identify and protect wetlands and enforce the Wetlands Rules.
• M.C. Mehta vs Kamal Nath (1997) — applied the public trust doctrine to protect a river and its ecosystem from private diversion; the same principle protects lakes and wetlands as public natural resources.

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