THE REPUBLIC OF THE UNION OF MYANMAR YANGON CITY DEVELOPMENT COMMITTEE (YCDC) PREPARATORY SURVEY REPORT ON THE PROJECT FOR THE IMPROVEMENT OF WATER SUPPLY, SEWERAGE AND DRAINAGE SYSTEM IN YANGON CITY IN THE REPUBLIC OF THE UNION OF MYANMAR VOLUME VII SEWERAGE AND DRAINAGE SYSTEM FEASIBILITY STUDY < Advance Version > MARCH 2014 JAPAN INTERNATIONAL COOPERATION AGENCY TEC INTERNATIONAL CO., LTD. NJS CONSULTANTS CO., LTD. NIPPON KOEI CO., LTD. TOKYO SUIDO SERVICES CO., LTD. GE TOYO ENGINEERING CORPORATION JR（先） 14-083 THE PROJECT FOR THE IMPROVEMENT OF WATER SUPPLY, SEWERAGE AND DRAINAGE SYSTEM IN YANGON CITY FINAL REPORT MARCH 2014 GENERAL LIST OF REPORTS VOLUME I: WATER VISION OF YANGON CITY VOLUME II: WATER SUPPLY SYSTEM SUMMARY VOLUME III: WATER SUPPLY SYSTEM MASTER PLAN VOLUME IV: WATER SUPPLY SYSTEM FEASIBILITY STUDY VOLUME V: SEWERAGE AND DRAINAGE SYSTEM SUMMARY VOLUME VI: SEWERAGE AND DRAINAGE SYSTEM MASTER PLAN VOLUME VII: SEWERAGE AND DRAINAGE SYSTEM FEASIBILITY STUDY The Project for the Improvement of Water Supply, Sewerage and Drainage System in Yangon City Vol VII Sewerage and Drainage System Feasibility Study TABLE OF CONTENTS CHAPTER 1. SUMMARY OF MASTER PLAN AND PROJECT FOR FEASIBITY STUDY ................................................................................................................. 1-1 1.1 Summary of Master Plan ...................................................................................................... 1-1 1.2 Existing System .................................................................................................................... 1-4 CHAPTER 2. WATER QUALITY IMPROVEMENT OF KANDAWGYI LAKE .................. 2-1 2.1 Outline of Kandawgyi Lake and Its Basin ............................................................................ 2-1 2.2 Outline of Project .................................................................................................................. 2-1 2.3 Comparison of Water Quality Improvement Measures......................................................... 2-4 2.3.1 Construction of Interceptor Sewer ................................................................................ 2-4 2.3.2 Installation of Small Domestic Wastewater Treatment Apparatus (Johkaso) ................ 2-5 2.3.3 Dredging of Sediment ................................................................................................. 2-11 2.3.4 Water Transmission from Inya Lake ........................................................................... 2-11 2.3.5 Conclusion ................................................................................................................... 2-13 2.4 Design Condition of Interceptor Sewer .............................................................................. 2-14 2.4.1 Design Condition......................................................................................................... 2-14 2.4.2 Facility Design ............................................................................................................ 2-16 2.4.3 Construction Plan ........................................................................................................ 2-21 2.4.4 Operation and Maintenance Plan ................................................................................ 2-23 2.5 Dredging ............................................................................................................................. 2-25 2.5.1 Basis for Planning ....................................................................................................... 2-25 2.5.2 Dredging Work Using YCDC Dredging Equipment ................................................... 2-26 2.6 Cost Estimation and Implementation Schedule .................................................................. 2-29 2.6.1 Condition of Cost Estimation ...................................................................................... 2-29 2.6.2 Condition of Construction Cost ................................................................................... 2-29 2.6.3 Estimation of Project Cost ........................................................................................... 2-29 2.6.4 Estimation of O&M Cost ............................................................................................ 2-30 2.6.5 Implementation Schedule of the Project ..................................................................... 2-31 2.7 Project Evaluation ............................................................................................................... 2-31 2.7.1 Project Outline ............................................................................................................ 2-31 2.7.2 Economic Analysis ...................................................................................................... 2-35 2.7.3 Financial Analysis ....................................................................................................... 2-37 2.7.4 Improvement of Kandawgyi Lake Water Environment .............................................. 2-39 CHAPTER 3. C1 SEWERAGE ZONE ........................................................................................ 3-1 3.1 Outline of C1 Sewerage Zone ............................................................................................... 3-1 3.2 Design Conditions ................................................................................................................. 3-5 i The Project for the Improvement of Water Supply, Sewerage and Drainage System in Yangon City Vol VII Sewerage and Drainage System Feasibility Study 3.3 Sewer System Design ........................................................................................................... 3-7 3.4 WWTP Design .................................................................................................................... 3-15 3.4.1 Basis for Design .......................................................................................................... 3-15 3.4.2 WWTP Facility Design ............................................................................................... 3-17 3.4.3 Mechanical Equipment Design ................................................................................... 3-22 3.4.4 Electrical Equipment Design ....................................................................................... 3-29 3.5 Construction Plan ................................................................................................................ 3-32 3.6 Operation and Maintenance Plan ........................................................................................ 3-37 3.6.1 Sewerage Ledgers and Records ................................................................................... 3-37 3.6.2 Operation and Maintenance of Sewer Systems ........................................................... 3-38 3.6.3 Operation and Maintenance of the WWTP ................................................................. 3-39 CHAPTER 4. COST ESTIMATION AND IMPLEMENTATION SCHEDULE ..................... 4-1 4.1 Condition of Cost Estimation ............................................................................................... 4-1 4.2 Condition of Construction Cost ............................................................................................ 4-2 4.3 Cost Estimation of the Project .............................................................................................. 4-3 4.4 Implementation Schedule...................................................................................................... 4-4 4.5 Consulting Service ................................................................................................................ 4-6 4.6 Estimation of O&M Cost ...................................................................................................... 4-8 4.7 Operation and Index Indicators ............................................................................................. 4-8 4.8 Organizational Structure for Implementing the Project ...................................................... 4-10 4.8.1 Organizational Structure for Implementing the Project .............................................. 4-10 4.8.2 Division of Duties for PIA and Organizational Arrangement ..................................... 4-12 4.9 Remarks for Project Implementation .................................................................................. 4-14 4.9.1 Procurement Environment of Relevant Experiences of the Myanmar Side ................ 4-14 4.9.2 Bidding Methods and Setting of Contract Conditions ................................................ 4-18 4.9.3 Selection Policy for Consulting Firms ........................................................................ 4-18 4.9.4 Selection Policy for Contractors ................................................................................. 4-19 CHAPTER 5. CAPACITY DEVELOPMENT PLAN ................................................................. 5-1 5.1 Outline of Capacity Development ........................................................................................ 5-1 5.1.1 Concept of Capacity Development................................................................................ 5-1 5.1.2 Capacity Development Methods ................................................................................... 5-1 5.2 Necessity of Capacity Development ....................................................................................