Initial Environmental Examination Study for Proposed

Table of Contents Table of Contents ......................................................................................................................................... i List of annexes ............................................................................................................................................. iii List of figures ............................................................................................................................................... iv List of tables.................................................................................................................................................. v Executive summary..................................................................................................................................... vi 1. Introduction ......................................................................................................................................... 1 1.1 Background of the project ......................................................................................................... 1 1.2 Objectives and justification of the proposed project ............................................................. 1 1.3 Objectives of the IEE report (Specify the objectives of the assessment and the relationship of the results to the project design and implementation) ............................................ 3 1.4 Conformity with the other projects/development /conservation plans in the area ......... 5 1.5 Approvals needed for the proposed development from the other state agencies ............. 5 1.6 Any conditions laid down by the state agencies in granting preliminary clearances for the project ................................................................................................................................................. 6 2. Description of the proposed project ................................................................................................ 6 2.1 Description of the proposed project ........................................................................................ 6 2.1.1 Project location.................................................................................................................... 6 2.1.2 Nature and design of the project components ............................................................... 7 2.1.3 Pre-construction and construction activities................................................................. 10 Pre-construction activities ........................................................................................................................ 10 2.1.4 Operational activities ........................................................................................................ 12 2.1.5 Details of the phased implementation schedule ........................................................... 14 3. Description of the existing environment ....................................................................................... 17 3.1 Physical Environment ............................................................................................................... 17 3.1.1 Topography ........................................................................................................................ 17 3.1.2 Hydrological characteristics of the river reach ............................................................. 17 3.1.3 Water quality ...................................................................................................................... 26 3.1.4 Geology and soil characteristics ...................................................................................... 35 3.1.5 Land use ............................................................................................................................. 35 3.2 Biological Environment ........................................................................................................... 37 3.3 Social Environment .................................................................................................................. 43 i 4. Anticipated environmental impacts of the proposed project ..................................................... 49 4.1 Hydrological impacts ................................................................................................................ 49 4.2 Water quality impacts ................................................................................................................ 51 4.3 Soil Erosion and siltation ......................................................................................................... 57 4.4 Noise or vibration ..................................................................................................................... 59 4.5 Ecological impacts .................................................................................................................... 61 4.6 Sociological/ cultural impacts ................................................................................................. 63 5. Proposed mititatory measures.......................................................................................................... 67 5.1 Proposed mitigatory measures to minimize hydrological impacts ..................................... 67 5.1.1 Obstruction of natural flow pattern of the river .......................................................... 67 5.1.2 Increase in water level upstream of the dam during normal discharge of the river 67 5.1.3 Increase in stream flood levels ........................................................................................ 67 5.1.4 Anticipated reduction of the downstream flow of the river specially during low flow 67 5.1.5 Impact on other water intakes ........................................................................................ 67 5.1.6 Impact on irrigation & flood protection works and flood discharge outlets ........... 67 5.1.7 Anticipated changes of ground water levels and resulting impacts ........................... 68 5.2 Proposed mitigatory measures to minimize sociological impacts ...................................... 68 5.2.1 Mitigation of Impacts of relocation of people .............................................................. 68 5.2.2 Impacts on livelihood and economic activities. ............................................................ 68 5.2.3 Increased traffic on the Colombo-Kandy main road and other roads...................... 68 5.2.4 Impact on transport service provided by the three wheels ......................................... 69 5.2.5 Impact on the small industry of making cement blocks as building material .......... 69 5.3 Proposed mitigatory measures to minimize impacts on existing infrastructure facilities. 69 5.3.1 Impacts on roads. .............................................................................................................. 69 5.3.2 Impact on the power supply............................................................................................ 69 5.3.3 Impact on telephone lines ............................................................................................... 69 5.3.4 Impact on water supply. ................................................................................................... 69 5.4 Proposed mitigatory measures to minimize impacts of water quality ............................... 70 5.4.1 Proposed measured to minimize pollutants in the effluent ........................................ 70 5.4.2 Proposed measures to address surface water quality deterioration due to factors other than disposal of effluent from the sludge treatment facility ............................................. 73 ii 5.4.3 Proposed measures to mitigate water contamination from sources other than suspended sediments ......................................................................................................................... 73 5.4.4 Proposed mitigation measures to address groundwater quality deterioration ......... 74 5.5 Proposed mitigatory measures to minimize soil pollution .................................................. 74 5.5.1 Proposed measures to dispose the dried sludge ........................................................... 74 5.5.2 Proposed measures to mitigate degradation of soil from erosion, removal, or loss of soil during construction ............................................................................................................... 76 5.6 Proposed mitigation measures to address noise pollution .................................................. 77 6. Environmental monitoring programme ......................................................................................... 78 6.1 Environmental monitoring committee .................................................................................. 78 6.2 Environmental monitoring aspects ........................................................................................ 79 7. Conclusions and recommendations ................................................................................................ 83 List of annexes Annex I - Terms of Reference Annex II- Sources of data and Information Annex III - References Annex IV - List of prepares including their work allocation. Annex V - Complete set of relevant maps, tables, charts, layout plans and other details Annex V-1 - General layout and hydraulic design of the proposed weir site Annex V-2 - Cross section of the weir Annex V-3 - Longitudinal

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