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Executive Summary

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Executive Summary

  1. 1. Summary for Restoration and Protection of Six lakes within Chennai Metropolitan Area Executive Summary
  2. 2. The project is titled as “Preparation of Detailed Project Report for Restoration and Protection of six lakes within the Chennai Metropolitan Area”. Government of Tamil Nadu (GoTN), through the Chennai Rivers Restoration Trust (CRRT) and Tamil Nadu Urban Infrastructure Financial Services Limited (TNUIFSL), has taken the initiative for the restoration and protection of Lakes in CMA. The proposed project is aimed for the restoration and protection of the six lakes in CMA by undertaking interventions in the basin and catchment area for water recharging and retaining in the lake. The study area of 6 Lakes are located within the Chennai Metropolitan Area. The Lakes chosen for the restoration are: Lakes in South Chennai 1) Velachery Lake 2) Nanmangalam Lake 3) Kovilambakkam Eri 4) Nesavalar Nagar Lake Lakes in North Chennai 5) Kadapakkam Panchayat Lake in Manali Zone 6) Kolathur Lake
  3. 3. For executing the project a methodology was framed as shown in the figure. Survey and Investigations were carried out including Topographical and bathymetric survey to study the present condition Inlet and Outlet structures, Point sources of pollution, Solid waste dumping sites, present usage, water quality, Biodiversity and focus groups. Hydraulic particulars were collected from the PWD, WRD. The hydrological analysis include water balance studies, water holding capacity of lakes, Hydrological modelling, lake catchment, inlets and outlets, drainage networks, rainfall & dependability analysis, Runoff Estimation, connectivity and carrying capacity of the channels. One of the primary purposes of the project is to restore the connectivity between the lakes as shown in figure The existing water samples collected were tested and analyzed for identification of 35 different parameters conforming to CPCB guidelines at several locations for all six lakes. Sediments samples were collected at three locations including inlet, outlet and water spread area. Habit composition of floral species of the lake is dominated by herbs, followed by shrub, trees and climbers, grasses and aquatic.
  4. 4. Focus group discussion (FGD) was carried out initially to identify key issues and suggestions for restoration and protection from the locals. Stakeholders meetings were conducted at local and official levels. The key issues and suggestions were put forth as per below by the stakeholders were considered in preparing the restoration plan.  Alteration and disturbance in drainage pattern and the entire hydrology  Blocked/ruined inlets and outlets  Physical encroachments on bunds  Patronage from surrounding community  No adequate fencing.  Inadequate Infrastructure for developmental potential  Shrinkage in Lake submergence due to encroachments Based on survey and analysis three strategy for restoration was prepared. Preservation & Restoration Programme of Water Bodies Conservation of Water Bodies Urban Design Intervention Programme with a mix of preservation and conservation aspects.

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