Support restoration of Anayarkulam Lake in Tirunelveli district | Milaap
Support restoration of Anayarkulam Lake in Tirunelveli district
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Need Rs.31,90,000
  • Arun

    Created by

    Arun
  • EF

    This fundraiser will benefit

    Environmentalist Foundation of India

    from Chennai, Tamil Nadu

80G tax benefits for INR donations

Story

The Anayarkulam is located amidst the peri-urban area of the Tirunelveli district. It covers an area of 48 acres and lies between the 8°41'13.1"N, Latitude and 77°45'09.7"E, Longitude. The average annual temperature in the district is 29˚C with an annual rainfall which aggregates up to 752mm. The lake is impacted due to excessive siltation and overrun by invasive species. Similarly, the growth of invasive weeds, algal blooms, and eutrophication in the lake degrades the species in the littoral zone posing a major threat to the dependents of the region due to lack of light and oxygen. Hence, there is a need for scientific restoration and sustainable interventions to revive its ecological identity and conserve its biological resources.

Summary Sheet
Name of the LakeAnayarkulam
 



Status
Being located close to irrigation lands, the lake plays a key role as a direct source of water for nearly an area covering 300 acres. Improper maintenance has led to the widespread growth of invasive weeds such as Ipomoea carnea, Prosopis julifora and water hyacith. Has the potential to be revived into a storage reserve supporting several endemic lives.
Type of LakeSystem Urban
Total Area (as per GIS survey)48 acres
Water SourceRainwater
Purpose of TankGroundwater Recharge
Purpose of RestorationRefurbishment of the water body, Increased Capacity, Groundwater Recharge, Weed Removal and Removal of Waste.
Location Linkhttps://goo.gl/maps/eDbzs5aSp92Fne8V6

Present Condition of the lake:
 
The Lake is 48 acres in area and located in the Tirunelveli District of Tamil Nadu. It is presently covered with water hyacinth on surface water and solid waste dumped around the corners. The bunds are weak and are not distinct. The Lake is in a peri-urban region surrounded by irrigation lands and has a potential to perform as a recharge zone for groundwater. The garbage would first need to be removed followed by the desilting and de-weeding process. The contour must be deepened and the excessive silt has to be removed. The Lake is filled with invasive vegetation which shall be removed. If no interventions are taken anytime soon this may very well disappear under a building.


Tentative Cost Estimate:

Proposed ActivityBudgetMore Info
Lake Desilting and Deweeding

Removing of 3-4ft silt across the entire expanse of the lake during the dry season.
 


Rs. 12,00,000/-
Silt will be dredged and evenly spread across to ensure increase water holding capacity and used to strengthen the bunds. Geometric islands will be created within the lake.
There is extensive overgrowth of weeds across the lakes and also large sediments of silt. To remove the silt and the weed machinery will be used.
Bund Construction & Strengthening, Island Construction

Using the excavated silt the bund around the entire expanse of the lake will be
packed for 3-4ft height.
 



Rs. 9,00,000
 

To deposit the silt that is being removed and neatly pack the bund across the entire length, and to create nesting islands that would host birds, reptiles, amphibians.
Protective Fencing

To protect the lake from future encroachment and
trash.
 

Rs. 8,00,000/-
 
A 7ft high “Diamond Mesh Fence” covered on top with Barbed Wire roll will be laid. This will be  intermittently strengthened by Concrete slab posts.
Administrative cost 
Rs.2,90,000/-
Admin, Project Management and Incidental expenditure
 
Grand Total
 
Rs.31,90,000 /-



Objectives of Lake Restoration
 
There is no single method used in restoring a water body, depending on the situation appropriate methods are chosen. Majority of the work is done using excavation-based equipment which E.F.I hires on a rental basis. To summarize, the key interventions in this restoration include:

Removal of Invasive Weeds and Garbage:
All the invasive weeds along with the solid waste have been cleared from the site, this plays an important role in protecting the ecosystem as the invasive species can pose a big threat towards the naturally found flora and fauna in the region and to protect the lakebed. The cleared waste has been taken by the corporation to a near-by dumping site.

Removal of Sediments along the periphery of the bund:
This step involves removal of excessive silt and nutrient rich sediments also referred to as dredging and desilting. This step is carried out to ensure that the waterbody is able to hold water which also avoids eutrophication (in case of nutrient rich sediment). Further with deepening of the water body the total water holding capacity is increased. The deepening is done based on the soil type and the conditions, in this lake an average of 3-4 feet worth of silt has been removed which has been used for construction of the earthen bunds.

Bund Construction and Strengthening:
This step involves creation of bunds with the help of special compactor-based equipment that worked on it. The bunds play an important role in protecting the surrounding areas in the advent of floods and prevent erosion.
Creation of Dual embankment structures and Nesting

Islands:
This method has been implemented to prevent rapid soil erosion and protect the lake from further dumping of waste. Nesting islands covered with native plants and trees provide a habitat for birds, amphibians and reptiles to lay eggs/nurture their young ones.

Fencing:
Fencing waterways protects freshwater from nutrients, effluent and sediment by excluding stock and creating a buffer between water and the land. Fencing will help to maintain and improve water quality and create a habitat for birds and freshwater species
Plantation and Beautification:
Plant root systems stabilize sediment both within and around the lake, reducing shoreline erosion and keeping the lake clear. It plays a significant role in checks and balances, and also adds to the natural beauty of the lake.

Timeline:
Restoration Timeline – January 2022 to May 2022

To summarize, the key interventions in the restoration of the lake include:
  • Invasive vegetation will be removed to conserve the native biodiversity
  • Solid waste shall be removed from the water body
  • The bed of the lake will be desilted and dredged to increase the groundwater recharge
  • The excavated soil will be used in the formation and strengthening of bunds
  • The pond will be fenced to prevent further encroachments and dumping of waste
  • Reintroduction of native plants for better subsurface water retention.
Thank You and we look forward to your support.

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