Final Report Volume Iii : Supporting Report (1) (Master Plan)
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JAPAN INTERNATIONAL COOPERATION AGENCY MINISTRY OF HOUSING & PLANTATION INFRASTRUCTURE SRI LANKA LAND RECLAMATION & DEVELOPMENT CORPORATION THE STUDY ON STORM WATER DRAINAGE PLAN FOR THE COLOMBO METROPOLITAN REGION IN THE DEMOCRATIC SOCIALIST REPUBLIC OF SRI LANKA FINAL REPORT VOLUME III : SUPPORTING REPORT (1) (MASTER PLAN) MARCH 2003 NIPPON KOEI CO., LTD. LIST OF VOLUMES VOLUME I : EXECUTIVE SUMMARY VOLUME II : MAIN REPORT VOLUME III : SUPPORTING REPORT (1) VOLUME IV : SUPPORTING REPORT (2) VOLUME V : DATA BOOK Exchange Rate Applied US$1.00 = Sri Lanka Rupee 96.26 = ¥ 118.94 (as of August 2002) N 79 50' E 80 E IN ° ° OF GAL Negombo G M SRI LANKA AREA COLOMBO 7°10' N OF MAP INDIAN OCEAN Key Map 80°10' E Ja Ela Basin Kalu Oya Basin 7°N Colombo Greater Colombo Basin Weras Ganga Basin 6°50' N Bolgoda Basin Panadura 6°40' N Legend Basin Boundary Scale Study Area Boundar 0 5 10 km Kalutara The Study on Storm Water Drainage Plan for the Colombo Metropolitan Region in the Democratic Socialist Republic of Sri Lanka Location Map JAPAN INTERNATIONAL COOPERATION AGENCY THE STUDY ON STORM WATER DRAINAGE PLAN FOR THE COLOMBO METROPOLITAN REGION IN THE DEMOCRATIC SOCIALIST REPUBLIC OF SRI LANKA FINAL REPORT VOLUME III : SUPPORTING REPORT (1) (MASTER PLAN) LIST OF ANNEXES ANNEX 1 SOCIO-ECONOMY AND ECONOMIC EVALUATION ANNEX 2 INSTITUTION AND LEGISLATION ANNEX 3 HYDROLOGY ANNEX 4 LAND USE ANNEX 5 ENVIRONMENT ANNEX 6 SOCIAL DIMENSIONS ANNEX 7 OUTFALL TREATMENT ANNEX 8 STORM WATER DRAINAGE ANNEX 9 PRELIMINARY DESIGN ANNEX 10 CONSTRUCTION PLAN AND COST ESTIMATE ANNEX 11 OPERATION AND MAINTENANCE i SUPPORTING REPORT (1) ANNEX 1 : SOCIO-ECONOMY AND ECONOMIC EVALUATION THE STUDY ON STORM WATER DRAINAGE PLAN FOR THE COLOMBO METROPOLITAN REGION IN THE DEMOCRATIC SOCIALIST REPUBLIC OF SRI LANKA FINAL REPORT VOLUME III : SUPPORTING REPORT (1) ANNEX 1 : SOCIO-ECONOMY AND ECONOMIC EVALUATION TABLE OF CONTENTS Page CHAPTER 1 PRESENT CONDITION OF THE STUDY AREA 1.1 General Characteristics of the Study Area ......................................................A1-1 1.2 Administrative Division...................................................................................A1-1 1.3 Population........................................................................................................A1-1 1.3.1 Population Density.............................................................................A1-2 1.3.2 Population Growth Trend ..................................................................A1-2 1.4 Economic Conditions ......................................................................................A1-2 1.4.1 National Economy .............................................................................A1-2 1.4.2 Regional Economy (GRDP) ..............................................................A1-4 1.5 Household Income in the Study Area..............................................................A1-5 1.6 Public Finance .................................................................................................A1-6 1.6.1 Trend of Public Finance.....................................................................A1-6 1.6.2 Fiscal Structure ..................................................................................A1-6 1.6.3 Financing of Debt ..............................................................................A1-7 1.6.4 Government Policy on Fiscal Operations Reform.............................A1-7 1.6.5 Policy on Allocation of Budget Expenditure.....................................A1-8 1.6.6 Financing of Storm Water Drainage Projects ....................................A1-8 CHAPTER 2 SOCIO-ECONOMIC FRAMEWORK 2.1 General ............................................................................................................A1-10 2.2 Population Framework ....................................................................................A1-10 2.3 Economic Framework .....................................................................................A1-11 2.3.1 Economic Framework of Sri Lanka...................................................A1-11 2.3.2 Economic Framework of the Study Area ..........................................A1-12 2.4 Future Property Values....................................................................................A1-13 2.4.1 Land Value.........................................................................................A1-13 2.4.2 Residential and Commercial Values ..................................................A1-14 2.5 Socio-Economic Frame for Master Plan .........................................................A1-15 i CHAPTER 3 ECONOMIC EVALUATION FOR MASTER PLAN 3.1 Methodology.................................................................................................... A1-16 3.2 Economic Cost ................................................................................................ A1-16 3.3 Economic Benefit............................................................................................ A1-16 3.3.1 Types of Project Benefits .................................................................. A1-16 3.3.2 Flood Damage Reduction Benefit...................................................... A1-17 3.4 Land Enhancement Benefit............................................................................. A1-21 3.5 Intangible Benefit ............................................................................................ A1-22 3.6 Economic Evaluation for Proposed Storm Water Drainage Project ............... A1-24 3.6.1 Basic Conditions................................................................................ A1-24 3.6.2 Economic Evaluation for Proposed Projects..................................... A1-24 3.6.3 Result of Evaluations......................................................................... A1-24 3.6.4 Sensitivity Analysis............................................................................ A1-25 ii LIST OF TABLES Page Table 1.2.1 D.S. Division and Population in the Study Area............................. A1-T1 Table 1.2.2 Local Authorities in the Study Area and Population...................... A1-T2 Table 1.4.1 Gross Domestic Product at Constant at 1996 Price ....................... A1-T3 Table 1.4.2 Trade Balance................................................................................. A1-T4 Table 1.4.3 Employment by Sector in Sri Lanka............................................... A1-T5 Table 1.4.4 Employment Status for the Past 10 years in Sri Lanka .................. A1-T6 Table 1.4.5 Gross Regional Domestic Product of Western Province at 1990............................................................................................ A1-T7 Table 1.4.6 Sectoral Classification of Employed Labor Force.......................... A1-T8 Table 1.5.1 Average Monthly Household Income by Source of Income, Province and District...................................................................... A1-T9 Table 1.5.2 Average Monthly Household Expenditure ..................................... A1-T10 Table 1.6.1 Summary of Government Fiscal Operations ...................................A1-T11 Table 1.6.2 Economic Classification of Expenditure and Lending minus Repayment............................................................. A1-T12 Table 1.6.3 Outstanding Central Government Debt.......................................... A1-T13 Table 2.2.1 Estimated Urban Population of the CMR Based on Assumed Growth Rate (1996-2010) .............................................. A1-T14 Table 3.3.1 Flood Damage per Hectare............................................................. A1-T15 Table 3.3.2 Inundation Area by Inundation Depth for Different Probable Flood (Future Land Use)................................. A1-T16 Table 3.3.3 Direct Flood Damage per Hectare with Inundation Depth (1/4 - 4/4) .......................................................... A1-T17 Table 3.3.4 Probable Flood Damage ................................................................. A1-T21 Table 3.3.5 Annual Average Flood Damage...................................................... A1-T22 Table 3.6.1 Cost Benefit Stream for Ja Ela Basin............................................. A1-T23 Table 3.6.2 Cost Benefit Stream for Kalu Oya Basin ....................................... A1-T24 Table 3.6.3 Cost Benefit Stream for Greater Colombo Basin........................... A1-T25 Table 3.6.4 Cost Benefit Stream for Bolgoda Basin ......................................... A1-T26 iii LIST OF FIGURES Page Figure 1.2.1 D.S. Divisions in the Study Area .....................................................A1-F1 iv Final Report, Volume III Master Plan Supporting Report (1) Annex 1, Chapter 1 CHAPTER 1 PRESENT CONDITION OF THE STUDY AREA 1.1 General Characteristics of the Study Area The study area, which belongs to the Western Province or the Colombo Metropolitan Region (CMR), is the most urbanized area in Sri Lanka and is considered the center of economy, politics, and social activities. Urban areas have been growing in the study area, particularly the suburbs of Colombo Municipality. Because of rapid urban development, low land area, which functions as a retention area, has been decreasing, and flood damage is expected to increase. Balanced urban growth is a major issue of CMR. The Urban Development Authority (UDA) prepared the Colombo Metropolitan Regional Structure Plan (CMRSP) to promote balanced urban development by proposing a zoning plan and an infrastructure plan. 1.2 Administrative