Sri Lanka: Greater Colombo Wastewater Project Financed by the Japan Special Fund
Total Page：16
File Type：pdf, Size：1020Kb
Technical Assistance Consultant’s Report Project Number: 36173 Democratic Socialist Republic of Sri Lanka: Greater Colombo Wastewater Project Financed by the Japan Special Fund Prepared by: WS Atkins International Ltd (Water) United Kingdom In association with Nippon Koei Co. Ltd, Japan and Ceywater Consultants (Pvt) Ltd Sri Lanka For Ministry of Urban Development and Water Supply (Executing agency) National Water Supply and Drainage Board (Implementing agency) This consultant’s report does not necessarily reflect the views of ADB or the Government concerned, and ADB and the Government cannot be held liable for its contents. (For project preparatory technical assistance: All the views expressed herein may not be incorporated into the proposed project’s design. Greater Colombo Wastewater Management Project Sri Lanka PPTA 4531 - SRI For Asian Development Bank National Water Supply & Drainage Board Colombo Municipal Council Government of Sri Lanka VOLUME 1 Strategic Overview of the Project October 2007 (in association with) and Client: Asian Development Bank Project: Greater Colombo Wastewater Management Project Title: PPTA TA 4531-SRI Strategic Overview of the Project Job No: 5039498 Copy No: Reference: 5039498/60/DG/030 Copy No: 00 Master (unbound) file 60 Final TF RN RN October 2007 D2 Draft Final TF TF TF, AH RN 01/06/2007 1-D1 Interim Draft TF TF TF, AH RN 01/04/2007 Revision Purpose Originated Checked Reviewed Authorised Date TA 4531: Greater Colombo Wastewater Management Project Atkins International, Nippon Koei UK, Ceywater Volume 1 - Strategic Overview of the Project Abbreviations Term Meaning / Definitions ADB Asian Development Bank AMP Asset Management Plan BoI Board of Investment BoQ Bill of Quantities CCA Colombo Core Area CEA Central Environmental Authority CMC Colombo Municipal Council CSS Colombo Sewerage System DFID Department for International Development (UK Government) DMMC Dehiwala/Mt. Lavinia Municipal Council GCSP Greater Colombo Sewerage Project GoSL Government of Sri Lanka GCWP Greater Colombo Wastewater Project IFI(s) International Funding Institution(s) JICA Japan International Cooperation Agency KMPS Kotikawatta-Mulleriyawa Pradesiya Sabah KPI(s) Key Performance Indicators(s) KPS Kaduwela Pradesiya Sabah KUC Sri-Jayawardhenapura-Kotte Urban Council LA(s) Local Authority(ies) MIS Management Information System MUC Maharagama Urban Council NGO Non-Government Organisation NWSDB National Water Supply and Drainage Board O&M Operation and Maintenance PPTA Project Preparation Technical Assistance PRMC Performance Related Management Contract PUC Public Utilities Commission QAS Quality Assurance System SSTA Small Scale Technical Assistance ToR Terms of Reference UDA Urban Development Authority WRSP Western Region Structure Plan Note: (i) For area of land: 1 Perch is equivalent to approximately 25 m2 (ii) Currency exchange rate used: 1 USD (US$) = 111 SLRS 5039498/60/dg/030 i October 2007 TA 4531: Greater Colombo Wastewater Management Project Atkins International, Nippon Koei UK, Ceywater Volume 1 - Strategic Overview of the Project Definitions Except where explicitly stated otherwise, throughout the Final Report the following definitions apply: “Asset Management” “Asset Management” is the business system that encapsulates all activities of the NWSDB and the Operators, associated with the management, creation, operation, maintenance and rehabilitation of the NWSDB’s sewers, pumping stations and other assets used for the delivery of the wastewater service. “Board” The use of the word “Board” refers to the Board of the NWSDB. “Drainage” Within the context of Colombo, the word “drainage” has two meanings. The title: “National Water Supply and Drainage Board”, refers to foul wastewater, or sewerage drainage; within the Municipal Ordinance for Colombo Municipal Council, the word refers to surface water drainage. Within the Final Report, the internationally accepted terms “foul wastewater” and “surface wastewater” shall be used instead of drainage, except where the term “drainage” is explicitly required, as in talking about the National Water Supply and Drainage Board. The terms “foul wastewater” and “sewage” are synonymous as are the terms “sewerage” and “sewer system” or “sewer network”. The terms “sewerage infrastructure” or “sewerage network” are taken to include the pumping stations, also. “DMMC Unit” The term “DMMC Unit” refers to the operating unit of the NWSDB within the DMMC area. “Greater Colombo Wastewater Management Project” The term “Project” refers to the Greater Colombo Wastewater Management Project. “On-site”, “Underserved Areas” and “First-time Sewerage” The term “on-site” refers to the area within Greater Colombo but outside the Colombo Sewer System area where there are no public sewers and wastewater disposal is by private facilities within the boundary of households or by local communal means. The term “underserved” refers to the areas within the Colombo sewerage system area without sewers. Within the “underserved areas” where sewers are to be provided, the provision of the sewerage may be referred to as “first-time sewerage”. “Operators” The CMC drainage department and the DMMC Unit are referred to as the “Operator” or “Operators”. Within the on-site areas, the “operators” are the local authorities or contractors to the local authorities. “Non-Fixed Operational Plant” Non-fixed operational plant refers to plant and used by the Operators but which is not fixed at a site but taken to a working site by the Operators from their depot. Examples are sewer cleaning equipment, trench de-watering pumps, excavators and the like. “Performance Partnership Agreement” “Performance Partnership Agreement” and the “Agreement” refer to the Agreement between the NWSDB and the CMC and the DMMC unit for the delivery of the O&M of the wastewater assets. “Scheme” The term “scheme” refers to a works component of the Greater Colombo Wastewater Management Project. 5039498/60/dg/030 ii October 2007 TA 4531: Greater Colombo Wastewater Management Project Atkins International, Nippon Koei UK, Ceywater Volume 1 - Strategic Overview of the Project “Wastewater Management Unit” The recommended NWSDB Wastewater Management Unit may also be referred to as the “Wastewater Management Unit” or the “Management Unit”. 5039498/60/dg/030 iii October 2007 TA 4531: Greater Colombo Wastewater Management Project Atkins International, Nippon Koei UK, Ceywater Volume 1 - Strategic Overview of the Project Contents of the Final Report This Volume is one document within a suite of documents that comprises the Final Report for the PPTA4531: Greater Colombo Wastewater Management Project. The Final Report comprises: Volume 1: Strategic Overview of the Greater Colombo Wastewater Management Project; Volume 2: Capital Investment Schemes: Part A – Colombo Sewer System; Part B – Underserved Areas. Volume 3: On-Site Areas: Part A – Main Report; Part B – Sub-Report for the Kotte Pilot Study Part C - Sub-Report for the Maharagama Town Pilot Study Part D - Sub-Report for the Kaduwela Pilot Study. Volume 4: Procurement. Volume 5: Management Documentation Volume 6: Part A: Operational Management Plan; Part B: Partnership Performance Agreement; Part C: O&M Plan. Volume 7: Economic Assessment. Part A: Economic Analysis Part B: Project Costs Volume 8: Financial Management Assessment Volume 9: Social and Poverty Analysis. Volume 10: Part A - Re-Settlement Framework; Part B - Re-Settlement Plan for Colombo sewer system area Part C - Re-Settlement Plan for On-Site Areas Part D - Public Awareness Campaign Volume 11: Environmental Reports 5039498/60/dg/030 iv October 2007 TA 4531: Greater Colombo Wastewater Management Project Atkins International, Nippon Koei UK, Ceywater Volume 1 - Strategic Overview of the Project Table of Contents of this Volume Section Page Acknowledgements ix Foreword x Executive Summary xi 1. Sociological, Economic and Physical Characteristics of Project Area 1 1.1 Country Information 1 1.2 Economy 1 1.3 Administrative Areas 2 1.4 Project Area 4 1.5 Climate 4 1.6 Geology 4 1.7 Topography and Soils 5 1.8 Watercourses and Water Space 6 1.9 Land Use 6 1.10 Colombo Development Plans 8 2. Project Preparatory Technical Assistance. 11 2.1 Project Preparatory Technical Assistance Objectives 11 2.2 Past Studies 12 2.3 Need for a Strategy 13 3. Legal Framework and Government Policy towards the Sector 17 3.1 Institutional Structure 17 3.2 Relevant Laws 20 3.3 Government Policy for Wastewater Management 21 3.4 External Assistance to the Sector in Sri Lanka 22 3.5 Ownership of the Colombo Wastewater Assets 23 4. Strategy for the Main Sewer Area 25 4.1 Wastewater Infrastructure 25 4.2 Specific Concerns with the Existing Infrastructure 25 4.3 Current Projects 27 4.4 PPTA Proposals for the Main Sewer Area 27 4.5 Sea Outfalls 28 4.6 Fine Screens 29 4.7 Screenings Conditioning 34 4.8 Pumping Stations 35 4.9 Sewers 35 5. Strategy for Under-Served Areas 36 5.1 Existing Sewerage 36 5039498/60/dg/030 v October 2007 TA 4531: Greater Colombo Wastewater Management Project Atkins International, Nippon Koei UK, Ceywater Volume 1 - Strategic Overview of the Project 6. Strategy for Sewage Disposal 39 6.1 Current Position 39 6.2 International Context and Obligations 39 6.3 Options for Treatment at the Sea Outfalls 40 6.4 Wastewater Treatment Options 42 7. Strategy for the On-Site Areas 45 7.1 Capital Investment within On-Site Sanitation 47 7.2 Charges for Industrial Effluent Discharges 48 8. Institutional 50 8.1 General 50 8.2 National Water Supply and Drainage Board 51 8.3 Operators 52 8.4 SSTA Recommended Institutional Changes 52 8.5 Operator Performance 53 8.6 NWSDB Sewerage and Drainage Unit 55 8.7 Roles of the NWSDB and the Operators 55 8.8 Operator Organisation 56 8.9 Customer Service 57 8.10 Management Information System 58 8.11 Documentation 59 8.12 Institutional Arrangements for the On-Site Areas 60 9. Wastewater Service Charges 61 9.1 Introduction 61 9.2 Tariff Determination 61 9.3 On-Site Service Charges 63 9.4 New Service Connection Charges 64 9.5 Procedure for Under-served Areas 64 10.