Roleang Chrey Regulator and Intakes Improvement Project (Project Site) Irrigated Agriculture Improvement Model Project (Project Area) THE STUDY ON COMPREHENSIVE AGRICULTURAL DEVELOPMENT OF PREK THNOT RIVER BASIN IN THE KINGDOM OF CAMBODIA FINAL REPORT Volume-III: Feasibility Study for Priority/Urgent Projects Table of Contents LOCATION MAP ABBREVIATIONS AND MEASUREMENT UNITS PART-A: GENERAL INFORMATION Page Chapter A-1 Introduction................................................................................................ III-A-1 A-1.1 Authority ................................................................................................................... III-A-1 A-1.2 Composition of Final Report..................................................................................... III-A-1 A-1.3 Background ............................................................................................................... III-A-1 A-1.3.1 Master Plan Study.................................................................................... III-A-1 A-1.3.2 Selected Priority/Urgent Projects for Feasibility Study........................... III-A-2 A-1.4 Hydrological Relationship between Two Selected Priority/Urgent Projects............. III-A-2 A-1.5 Public Consultation Meeting ................................................................................... III-A-3 A-1.6 Technology Transfer.................................................................................................. III-A-3 Chapter A-2 Background................................................................................................ III-A-5 A-2.1 Natural and Socio-economic Conditions ................................................................. III-A-5 A-2.2 National Development Policies................................................................................. III-A-5 A-2.3 Sectoral Development Policies.................................................................................. III-A-5 List of Table Page Table A-2.1 Socio-economic Indicators of Cambodia..................................................III-AT-1 PART-B: ROLEANG CHREY REGULATOR AND INTAKES IMPROVEMENT PROJECT Page Chapter B-1 The Project Site...........................................................................................III-B-1 B-1.1 Location and Administration......................................................................................III-B-1 B-1.2 Topography and Geology...........................................................................................III-B-1 B-1.3 Hydrology ..................................................................................................................III-B-1 B-1.3.1 Prek Thnot River Condition......................................................................III-B-1 III-i Page B-1.3.2 Water Level and Discharge Measurement ................................................III-B-2 B-1.3.3 Floods .......................................................................................................III-B-2 B-1.4 Roleang Chrey Regulator...........................................................................................III-B-3 B-1.4.1 Civil Works...............................................................................................III-B-3 B-1.4.2 Hydro-mechanical Works .........................................................................III-B-3 B-1.5 Andong Sla Intake and Approach Channel ................................................................III-B-4 B-1.5.1 Civil Works...............................................................................................III-B-4 B-1.5.2 Hydro-mechanical Works .........................................................................III-B-4 B-1.6 Vat Krouch Intake and Approach Channel.................................................................III-B-5 B-1.6.1 Civil Works...............................................................................................III-B-5 B-1.6.2 Hydro-mechanical Works .........................................................................III-B-5 B-1.7 O&M ..........................................................................................................................III-B-6 B-1.8 Environment...............................................................................................................III-B-6 B-1.8.1 Social Environment..................................................................................III-B-6 B-1.8.2 Natural Environment ................................................................................III-B-8 B-1.8.3 Pollution....................................................................................................III-B-8 B-1.9 Problems and Constraints to Improvement ................................................................III-B-9 Chapter B-2 The Project................................................................................................III-B-10 B-2.1 Basic Approach to the Project ..................................................................................III-B-10 B-2.1.1 Need of Improvement .............................................................................III-B-10 B-2.1.2 Purpose and Development Concept........................................................III-B-10 B-2.2 Roleang Chrey Regulator Improvement Plan ..........................................................III-B-10 B-2.2.1 Basic Considerations ..............................................................................III-B-10 B-2.2.2 Design Flood...........................................................................................III-B-11 B-2.2.3 Civil Works.............................................................................................III-B-11 B-2.2.4 Hydro-mechanical Works .......................................................................III-B-12 B-2.3 Andong Sla Intake and Approach Channel Improvement Plan................................III-B-13 B-2.3.1 Basic Considerations ..............................................................................III-B-13 B-2.3.2 Civil Works.............................................................................................III-B-14 B-2.3.3 Hydro-mechanical Works .......................................................................III-B-15 B-2.4 Vat Krouch Intake and Approach Channel Improvement Project ............................III-B-16 B-2.4.1 Basic Considerations ..............................................................................III-B-16 B-2.4.2 Civil Works.............................................................................................III-B-17 B-2.4.3 Hydro-mechanical Works .......................................................................III-B-17 B-2.5 O&M Plan ................................................................................................................III-B-18 B-2.5.1 Responsible Organization .......................................................................III-B-18 B-2.5.2 Operation Plan........................................................................................III-B-18 B-2.5.3 Maintenance Plan....................................................................................III-B-20 B-2.6 Environmental Considerations.................................................................................III-B-21 B-2.7 Implementation Plan................................................................................................III-B-23 B-2.7.1 Implementation Schedule of the Project Works......................................III-B-23 B-2.7.2 Executing Agencies for Project Implementation ....................................III-B-24 B-2.7.3 Organization for Project Implementation ...............................................III-B-24 B-2.8 Environmental Examination.....................................................................................III-B-25 B-2.8.1 Environmental and Social Conditions to be examined ...........................III-B-25 B-2.8.2 Consideration of Environmental/Social Impact and Mitigation Measures.................................................................................................III-B-25 B-2.8.3 Environmental Management and Monitoring Plan.................................III-B-28 B-2.8.4 Comparative Evaluation of the Project...................................................III-B-29 B-2.8.5 Conclusions.............................................................................................III-B-30 B-2.9 Cost Estimate ...........................................................................................................III-B-31 III-ii Page B-2.9.1 Conditions of the Cost Estimate .............................................................III-B-31 B-2.9.2 Investment Cost......................................................................................III-B-31 B-2.9.3 Replacement Cost...................................................................................III-B-31 B-2.9.4 O&M Cost..............................................................................................III-B-32 B-2.10 Project Evaluation....................................................................................................III-B-32 B-2.10.1 General....................................................................................................III-B-32 B-2.10.2 Economic Evaluation..............................................................................III-B-32 B-2.10.3