The Feasibility Study of Extension and Expansion of Mohara Water Treatment Plant in Chittagong in the People's Republic of Ba
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JAPAN INTERNATIONAL COOPERATION AGENCY CHITTAGONG WATER SUPPLY AND SEWERAGE AUTHORITY MINISTRY OF LOCAL GOVERNMENT, RURAL DEVELOPMENT AND CO-OPERATIVES THE FEASIBILITY STUDY OF EXTENSION AND EXPANSION OF MOHARA WATER TREATMENT PLANT IN CHITTAGONG IN THE PEOPLE’S REPUBLIC OF BANGLADESH FINAL REPORT (MAIN REPORT) DECEMBER 2000 NJS CONSULTANTS CO., LTD. PREFACE In response to request to from the Government of the People’s Republic of Bangladesh, the Government of Japan decided to conduct a study on Extension and Expansion on Mohara Water Treatment Plant in Chittagong and entrusted the study to the Japan International Cooperation Agency (JICA). JICA sent to Bangladesh a study team composed of individuals from NJS Consultants Co., Ltd. headed by Mr. Kenji Hori. The team visited Bangladesh two times between January and October 2000. The team held discussions with the officials concerned of the Government of Bangladesh and conducted field surveys in the study area. After the team returned to Japan, further studies were made and the present report was prepared. I hope that the report will contribute to the promotion of the project and to the enhancement of friendly relations between our two countries. I wish to express my sincere appreciation to the officials concerned of the Government of Bangladesh for the close cooperation that they extended to the team. December 2000 Kunihiko Saito, President Japan International Cooperation Agency December 2000 Mr. Kunihiko Saito, President Japan International Cooperation Agency LETTER OF TRANSMITTAL Dear Sir, We are pleased to submit herewith the Final Report for the Study on Extension and Expansion on Mohara Water Treatment Plant in Chittagong. The Study was completed through discussions with the officials of the Government of Bangladesh and field investigations during two visits from January and July 2000 and the homework thereafter. The Final Report consists of three volumes: 1) the Summary Report, which succinctly describes the study and its recommendations; 2) the Main Report, which covers the findings of the Basic Plan and the Feasibility Study on the proposed Priority Project; and 3) the Supporting Report, which contains data upon which the Basic Plan and the Feasibility Study are based. We wish to take this opportunity to express our sincere gratitude to your Agency, the Ministry of Foreign Affairs and Ministry of Health and Welfare. We also would like to show our appreciation to the officials of the Chittagong Water Supply and Sewerage Authority, the Embassy of Japan in Bangladesh and the JICA Bangladesh Office for their kind assistance throughout this study. Very truly yours, Kenji Hori, Team Leader Study on Extension and Expansion on Mohara Water Treatment Plant in Chittagong FINAL REPORT (MAIN REPORT) TABLE OF CONTENTS Page PREFACE LETTER OF TRANSMITTAL LOCATION MAP TABLE OF CONTENTS------------------------------------------------------------------------------ i - vii LIST OF TABLES ----------------------------------------------------------------------------------- viii - xii LIST OF FIGURES --------------------------------------------------------------------------------- xiii - xv ABBREVIATION AND ACRONYMS------------------------------------------------------------ xvi - xix EXECUTIVE SUMMARY------------------------------------------------------------------------ S-1 ~ S-13 CHAPTER 1 INTRODUCTION 1.1 Preamble -------------------------------------------------------------------------------------------- 1-1 1.2 Background of the Study-------------------------------------------------------------- 1-1 1.3 Objective of the Study----------------------------------------------------------------- 1-2 1.4 Study Area------------------------------------------------------------------------------ 1-2 1.5 Scope of Work-------------------------------------------------------------------------- 1-3 1.6 Formation of the Study---------------------------------------------------------------- 1-3 1.6.1 General ------------------------------------------------------------------------ 1-3 1.6.2 Implementation Set-up by Japanese Side----------------------------------- 1-3 1.6.3 Implementation Set-up by Bangladesh Side ------------------------------- 1-4 1.7 Organization of the Study Report----------------------------------------------------- 1-4 CHAPTER 2 DESCRIPTION OF THE STUDY AREA 2.1 Natural Condition---------------------------------------------------------------------- 2-1 2.1.1 General ------------------------------------------------------------------------ 2-1 2.1.2 Topography, Geology and Meteorology ------------------------------------ 2-1 2.1.3 Rivers, Lake and Dam Condition ------------------------------------------- 2-2 2.2 Socio-Economic Condition ----------------------------------------------------------- 2-2 2.2.1 Economic Condition and Policy of the Government ---------------------- 2-2 2.2.2 Social Infrastructure---------------------------------------------------------- 2-4 i 2.2.3 Housing and Sanitation ------------------------------------------------------2-11 2.2.4 Land Use ----------------------------------------------------------------------2-13 2.2.5 Future Land Use Plan of CDA ----------------------------------------------2-22 CHAPTER 3 POPULATION AND WATER DEMAND PROJECTION 3.1 Population ------------------------------------------------------------------------------ 3-1 3.1.1 Population Growth Rate of Chittagong City ------------------------------- 3-1 3.1.2 Projection of Population in 2005 and 2010---------------------------------3-11 3.2 Present Water Demand ----------------------------------------------------------------3-11 3.2.1 Present Water Supply Condition --------------------------------------------3-11 3.2.2 Study on Present Water Supply Situation ----------------------------------3-12 3.3 Water Demand Projection in Target Years -------------------------------------------3-14 3.3.1 Water Demand Projection in 2005 ------------------------------------------3-14 3.3.2 Water Demand Projection in 2010 ------------------------------------------3-17 3.3.3 Comparison of Water Supply Condition between Present and Target Year --------------------------------------------------------------------3-19 CHAPTER 4 EXISTING WATER SUPPLY SYSTEM 4.1 Review of Existing Water Treatment Plant ------------------------------------------ 4-1 4.1.1 Mohara Water Treatment Plant---------------------------------------------- 4-1 4.1.2 Kalurghat Iron Removal Plant and Booster Pump Station ----------------4-10 4.2 Water Distribution System ------------------------------------------------------------4-17 4.2.1 Water Supply Pipeline by Diameter and Service Areas -------------------4-17 4.2.2 Reservoir and Booster Pump Station ---------------------------------------4-25 CHAPTER 5 STUDY ON WATER SOURCES 5.1 Water Quality Analysis ---------------------------------------------------------------- 5-1 5.1.1 Water Quality Analysis for Mohara Water Treatment Plant -------------- 5-1 5.1.2 Water Quality Analysis for Groundwater----------------------------------- 5-4 5.2 Saltwater Intrusion--------------------------------------------------------------------- 5-4 5.2.1 Past Records of Saltwater Intrusion----------------------------------------- 5-4 5.2.2 Survey for Saltwater Intrusion by JICA Study Team---------------------- 5-6 5.2.3 Study on Saltwater Intrusion ------------------------------------------------5-15 5.3 Study on Surface Water Resources Development-----------------------------------5-19 5.3.1 Water Resources Development in Halda River ----------------------------5-19 5.3.2 Water Resources Development in Karnaphuli River ----------------------5-23 5.4 Study on Groundwater Resources Development------------------------------------5-26 ii 5.4.1 Existing Deep Wells Owned by CWASA-----------------------------------5-26 5.4.2 Issues of Existing Wells ------------------------------------------------------5-31 5.4.3 Hydrological Conditions of Groundwater ----------------------------------5-34 5.4.4 Possibility of Groundwater Resources Development----------------------5-34 5.5 Conclusions and Recommendations--------------------------------------------------5-40 CHAPTER 6 STUDY ON MANAGERIAL ASPECTS OF WATER WORKS 6.1 Central Government Level Institution ----------------------------------------------- 6-1 6.1.1 Sector organization (Water Supply and Sanitation Sector)---------------- 6-1 6.1.2 Sector Financing-------------------------------------------------------------- 6-1 6.1.3 Sector Issues and Conditions ------------------------------------------------ 6-2 6.2 Study on Chittagong Water Supply and Sewerage Authority ---------------------- 6-3 6.2.1 Organization/Institution of CWASA---------------------------------------- 6-3 6.2.2 Legislation and Regulations Concerned with Water Management ------- 6-5 6.2.3 Water Tariff and Revenue---------------------------------------------------- 6-6 6.2.4 Financial Performance ------------------------------------------------------- 6-9 6.2.5 Water Supply Management --------------------------------------------------6-19 6.2.6 Evaluation and Recommendation on Management System---------------6-28 6.3 Study on Dhaka Water Supply and Sewerage Authority ---------------------------6-29 6.3.1 Profile of DWASA------------------------------------------------------------6-29 6.3.2 Water Supply Condition------------------------------------------------------6-30 6.3.3 Sewerage System in Dhaka ---------------------------------------------------------- 6-31 6.3.4 Finance and Business