LIBERIA DRAFT ROBERTSPORT WATER MASTER PLAN LIBERIA MUNICIPAL WATER PROJECT AUGUST 2012 This publication was produced for review by the United States Agency for International Development. It was prepared by Tetra Tech, Inc. This report was prepared for the United States Agency for International Development, USAID Contract No. EDH-I-00-08-00027, Task Order # AID-669-TO-11-00002, under the Global Architecture and Engineering Indefinite Quantity Contract (IQC) No. EDH-I-00-08-00027. Tetra Tech Contact Information: Alioune Fall, Chief of Party ([email protected]) David Favazza, Senior Technical Advisor/Manager ([email protected]) Tetra Tech P.O. Box 1397 Burlington, Vermont USA 05401 Tel: 802-658-3890 COVER PHOTO: The City of Robertsport, from the County Administrative Building, looking northeasterly towards the communities of Grassfields A & B with Fanti Town and Lake Piso in the background. All photos in this report are by Tetra Tech, Inc. DRAFT ROBERTSPORT WATER MASTER PLAN LIBERIA MUNICIPAL WATER PROJECT AUGUST 2012 DISCLAIMER The author’s views expressed in this publication do not necessarily reflect the views of the United States Agency for International Development or the United States Government. CONTENTS ACRONYMS AND ABBREVIATIONS ............................................................................................................ I EXECUTIVE SUMMARY ..................................................................................................................................... 1 1. MASTER PLAN SCOPE, PROCESS AND FORMAT .......................................................................................... 7 2. DEMOGRAPHICS ...................................................................................................................................... 12 2.1 POPULATION ESTIMATE .............................................................................................................. 12 2.2 ROBERTSPORT CITY WATER DEMAND ....................................................................................... 12 2.3 ROBERTSPORT PREVIOUS WATER SYSTEM ................................................................................. 15 3. CHALLENGES AND OPPORTUNITIES .......................................................................................................... 19 3.1 WATER SUPPLY CHALLENGES ..................................................................................................... 19 3.2 WATER SUPPLY OPPORTUNITIES ................................................................................................. 20 3.3 PROJECT-SPECIFIC CONSTRAINTS .............................................................................................. 20 4. WATER SYSTEM COMPONENTS ............................................................................................................... 22 4.1 GROUNDWATER SUPPLY OPTIONS .............................................................................................. 22 4.2 EXISTING HAND PUMP WELLS .................................................................................................... 23 4.3 POTENTIAL SERVICE AREAS ....................................................................................................... 30 4.4 SURFACE WATER SUPPLY OPTIONS ........................................................................................... 33 4.5 WATER TREATMENT OPTIONS .................................................................................................... 36 4.6 STORAGE OPTIONS .................................................................................................................... 52 4.7 WATER DISTRIBUTION OPTIONS.................................................................................................. 54 4.8 PUMPING POWER SYSTEMS OPTIONS ......................................................................................... 55 5. ALTERNATIVE FORMULATIONS ................................................................................................................. 59 5.1 PRESENTATION OF ALTERNATIVES .............................................................................................. 63 5.2 SOURCE ALTERNATIVE CONCLUSIONS ........................................................................................ 70 6. COST ESTIMATES .................................................................................................................................... 72 6.1 COST-BENEFIT ANALYSIS ........................................................................................................... 83 7. RECOMMENDATIONS OF SELECTED ALTERNATIVES ................................................................................... 87 7.1 SHORT-TERM PROJECT – PHASED CONSTRUCTION SEQUENCE ................................................... 87 7.2 SHORT TERM PROJECT - ESTABLISH PROTECTION OF FASA CREEK WATERSHED .......................... 88 7.3 MEDIUM-TERM PROJECTS .......................................................................................................... 89 7.4 LONG-TERM PROJECTS .............................................................................................................. 89 8. IMPLEMENTATION .................................................................................................................................... 90 8.1 ORGANIZATIONAL ....................................................................................................................... 90 8.2 STAKEHOLDER INPUT AND PUBLIC INVOLVEMENT ......................................................................... 91 8.3 FUNDING ................................................................................................................................... 91 8.4 PROCUREMENT .......................................................................................................................... 91 8.5 ASSET MANAGEMENT ................................................................................................................. 92 8.6 OPERATIONS AND MAINTENANCE MANUAL .................................................................................. 94 8.7 ECONOMIC SUSTAINABILITY ........................................................................................................ 94 8.8 LAND OWNERSHIP ..................................................................................................................... 98 8.9 SANITATION PLANNING ............................................................................................................... 98 8.10 SCHEDULE ........................................................................................................................ 98 8.11 COST OF OPERATION ....................................................................................................... 101 APPENDIX IS UNDER SEPARATE COVER LIST OF TABLES TABLE 2-1 LEVEL OF WATER SERVICE ........................................................................................................... 13 TABLE 2-2 LMWP PROPOSED IMPROVEMENT TO SERVICE LEVEL ................................................................... 14 TABLE 2-3 POPULATION AND DEMAND FLOW PROJECTIONS ............................................................................ 14 TABLE 4-1 ROBERTSPORT MONTHLY RAINFALL ............................................................................................... 35 TABLE 4-2 TYPICAL RESIDENTIAL RAIN HARVESTING SYSTEM ......................................................................... 35 TABLE 4-3 CHLORINATION QUANTITIES BY TYPE ............................................................................................ 37 TABLE 4-4 CHLORINE TABLET ESTIMATED COSTS .......................................................................................... 37 TABLE 4-5 TREATMENT PROCESSES FOR REMOVAL OF SPECIFIC CONSTITUENTS ............................................ 40 TABLE 4-6 LIST OF CONSTITUENTS & POTENTIAL APPLICABLE TREATMENT PROCESSES .................................. 43 TABLE 4-7 RECOMMEND INFLUENT CONCENTRATIONS FOR SLOW SAND FILTERS ............................................ 48 TABLE 4-8 APPROXIMATE EFFLUENT QUALITY FROM SLOW SAND FILTERS ...................................................... 48 TABLE 4-9 FILTER SIZE COMPARISON - REQUIRED TO AVAILABLE ................................................................... 49 TABLE 4-10 PACKAGE TREATMENT PLANT ESTIMATED COSTS ........................................................................ 51 TABLE 4-11 DURATIONS OF STORAGE IN ELEVATED TANK .............................................................................. 53 TABLE 4-12 COMPARISON OF ELEVATIONS THROUGHOUT ROBERTSPORT........................................................ 53 TABLE 4-13 ELECTRIC GENERATOR FOR PUMP COSTS ................................................................................... 56 TABLE 4-14 SOLAR POWER FOR PUMP OPERATION ALTERNATIVES................................................................. 56 TABLE 4-15 SOLAR POWER FOR PUMP COSTS ............................................................................................... 57 TABLE 4-16 WINDMILL PUMPING CAPACITIES ................................................................................................. 58 TABLE 5-1 DESCRIPTION OF SERVICE AREAS ................................................................................................. 60 TABLE 5-2 LIST OF HIGH YIELDING WELLS ....................................................................................................