Lake conservation

TMC – Thiruvananthapuram Municipal Corporation (TMC) can implement an Integrated Lake Conservation Plancovering all lakes and urban water bodies within the corporation area. The goal is to protect freshwater resources, prevent flooding, improve biodiversity, and develop eco-tourism. Below is a structured planning framework including major lakes and conservation actions.

Integrated Lake Conservation Plan

1. Major Lakes and Wetlands in TMC Area

Key lakes and backwater bodies connected to the urban ecosystem include:

  1. Vellayani Lake – Largest freshwater lake in Thiruvananthapuram and an important agricultural water source.

  2. Akkulam Lake – Connected with the backwater system near Technopark.

  3. Veli Lake – Located near Veli Tourist Village where the lake meets the Arabian Sea.

  4. Kadinamkulam Lake (Northern backwater) – Important coastal wetland.

  5. Avuthamkode Lake / Wetland area – Part of the southern wetland network.

  6. Karichal Lake / coastal lagoon system

  7. Temple ponds and urban kulams within corporation wards.

These lakes are part of a wider backwater and canal network extending from Vembanad system to Vellayani lake region, forming an interconnected wetland ecosystem.

2. Objectives of the Lake Conservation Plan

Environmental

  1. Restore water quality

  2. Protect biodiversity

  3. Prevent eutrophication

  4. Reduce sewage inflow

  5. Control invasive plants

Urban Resilience

  1. Flood mitigation during monsoon

  2. Rainwater storage and recharge

  3. Climate resilience

Social & Economic

  1. Eco-tourism development

  2. Community stewardship

3. Lake Mapping and Documentation

TMC should create a complete digital inventory of lakes.

Steps

  1. GIS mapping of every lake

  2. Demarcation of lake boundaries

  3. Identify feeder canals and drains

  4. Record lake area and depth

  5. Map encroachments

  6. Monitor water quality

  7. Biodiversity survey

  8. Identify pollution sources

  9. Hydrological connectivity mapping

  10. Public database of lakes

4. Pollution Control Measures

Sewage Management

  1. Prevent sewage discharge into lakes

  2. Construct decentralized STP units near lakes

  3. Connect houses to sewer network

  4. Install wastewater treatment wetlands

  5. Regular water quality testing

Solid Waste Control

  1. Floating trash barriers

  2. Waste traps in canals

  3. Ban dumping in lake areas

  4. Ward-level waste monitoring

  5. Strict enforcement and penalties

5. Lake Restoration Works

  1. Desilting of lake beds

  2. Removal of invasive plants (water hyacinth)

  3. Strengthening lake bunds

  4. Restoration of feeder canals

  5. Construction of sediment traps

  6. Rejuvenation of wetlands

  7. Bio-remediation of polluted lakes

  8. Lake aeration systems

  9. Floating wetlands for purification

  10. Rainwater recharge zones

6. Lake Protection Zones

TMC should declare Lake Protection Buffer Zones.

Suggested rules

  1. Minimum 30–50 m buffer zone around lakes

  2. Ban construction on lake banks

  3. Protect natural wetlands

  4. No waste dumping

  5. Control sand mining

  6. Preserve natural vegetation

  7. Stormwater drainage regulation

  8. Protect feeder streams

  9. Floodplain protection

  10. Environmental monitoring

7. Urban Lakefront Development

Sustainable development without damaging ecosystems.

  1. Walking paths around lakes

  2. Eco-parks

  3. Bird watching areas

  4. Natural landscaping

  5. Boating (controlled zones)

  6. Lighting and safety systems

  7. Public seating areas

  8. Lake interpretation centres

  9. Tourism facilities

  10. Heritage and cultural events

8. Biodiversity Protection

  1. Fish conservation

  2. Bird habitats

  3. Mangrove restoration

  4. Native aquatic plants

  5. Wetland vegetation zones

  6. Turtle and amphibian habitats

  7. Artificial nesting islands

  8. Biodiversity monitoring

  9. Wildlife protection rules

  10. Wetland education programs

9. Community Participation

  1. Ward Lake Committees

  2. Citizen monitoring groups

  3. School lake clubs

  4. Volunteer cleaning drives

  5. Public awareness campaigns

  6. Eco-tourism community jobs

  7. Fisher community involvement

  8. NGO partnerships

  9. CSR funding participation

  10. Annual lake festival

10. Governance & Implementation

Institutional Structure

  1. TMC Lake Conservation Cell

  2. Coordination with Kerala Wetland Authority

  3. Pollution Control Board monitoring

  4. Annual lake health report

  5. Budget allocation for restoration

  6. Lake ward officers

  7. Scientific advisory committee

  8. Satellite monitoring

  9. Public grievance portal

  10. Five-year conservation plan

Expected Outcomes

• Clean urban lakes
• Reduced flooding in Thiruvananthapuram
• Improved groundwater recharge
• Increased biodiversity
• Sustainable tourism
• Healthier urban environment