Climate Resilient Drinking Water Infrastructure Based on a Demand- Supply and Gap Analysis
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Synthesis Report Climate resilient drinking water infrastructure based on a demand- supply and gap analysis For 39 Unions of 5 Upazilas under Khulna and Satkhira District June 22, 2017 Submitted to: UNDP by WaterAid Bangladesh 2 Abbreviation ACS : Appreciative Consulting Services BDT : Bangladeshi Taka BOT : Build – Operate – Transfer BWDB : Bangladesh Water Development Board CBO : Community Based Organisation CCTF : Climate Change Trust Fund DPHE : Department of Public Health Engineering GIS : Geographic Information System GOB : Government of Bangladesh HH : Household ICCAD : International Conference on Computer Aided Design ITN-BUET : International Training Network – Bangladesh University of Engineering and Technology JMP : Joint Monitoring Programme KM : Kilometer LGSP : Local Government Support Project LPCD : Liter Per Capita Per Day LPD : Liter Per Day MAR : Managed Aquifer Recharge MIS : Management Information System MoEF : Ministry of Environment and Forest NAPA : National Adaptation Programme of Action O&M : Operation and Maintenance PPP : Public Private Partnership PPT : Parts Per Thousand PRA : Participatory Rural/Rapid Appraisal PSF : Pond Sand Filter PWS : Piped Water System RO : Reverse Osmosis RWH : Rain Water Harvesting RWHS : Rain Water Harvesting System SMC : School Management Committee Sq.km : Square Kilometer UNDP : United Nations Development Programme UNICEF : United Nations Children’s Emergency Fund UP : Union Parishad WAB : WaterAid Bangladesh WSP : Water Safety Plan WSP-WB : Water and Sanitation Program – The World Bank 3 Contents 1. INTRODUCTION .................................................................................................................................................. 7 1.1 PROJECT BACKGROUND AND OBJECTIVES ...................................................................................................................... 7 1.2 METHODOLOGY ....................................................................................................................................................... 7 2. NATIONAL AND COASTAL CONTEXT ................................................................................................................. 11 2.1 GEOGRAPHIC LOCATION .......................................................................................................................................... 11 2.1.1 Bengal Delta River System ......................................................................................................................... 11 2.1.2 Low Lying Coastal Areas............................................................................................................................. 13 2.2 HYDROLOGICAL SYSTEMS AND CLIMATE ...................................................................................................................... 14 2.2.1 Temperature .............................................................................................................................................. 14 2.2.2 Precipitation Patterns ................................................................................................................................ 15 2.2.3 Extreme Weather Events ............................................................................................................................ 17 2.3 SOCIOECONOMIC CONDITION ................................................................................................................................... 17 2.3.1 Population .................................................................................................................................................. 17 2.3.2 Economic Status ......................................................................................................................................... 18 2.3.3 Gender roles ............................................................................................................................................... 19 2.4 TARGETED DISTRICTS – PHASE I: KHULNA AND SATKHIRA ............................................................................................. 19 2.4.1 Khulna District ............................................................................................................................................ 19 2.4.2 Satkhira district .......................................................................................................................................... 20 3. DRINKING WATER SOURCES, SUPPLY AND ACCESS .......................................................................................... 22 3.1 FRESHWATER AVAILABILITY ...................................................................................................................................... 22 3.2 WATER QUALITY .................................................................................................................................................... 22 4. CLIMATE CHANGE IMPACTS ON COASTAL DRINKING WATER SOURCES, SUPPLY AND ACCESS ......................... 24 4.1 IMPACT OF CHANGE IN PRECIPITATION TRENDS ON COASTAL DRINKING WATER SOURCES, SUPPLY AND ACCESS ........................... 24 4.2 IMPACT OF OF CYCLONES AND TIDAL SURGES ON COASTAL DRINKING WATER SOURCES, SUPPLY AND ACCESS ............................ 25 4.2.1 Impact on water related infrastructure ..................................................................................................... 25 4.2.2 Impact on water ponds, ground and surface water ................................................................................................ 25 4.3 IMPACT OF SALINITY INTRUSION DUE TO SEA LEVEL RISE .................................................................................................. 26 4.4 SOCIAL IMPACTS ..................................................................................................................................................... 26 4.5 HEALTH IMPLICATIONS ............................................................................................................................................. 27 4.6 IMPACTS ON KHULNA AND SATKHIRA DISTRICTS ........................................................................................................... 28 4.6.1 Khulna District ............................................................................................................................................ 28 4.6.2 Satkhira District .......................................................................................................................................... 29 5. PAST AND ONGOING EFFORTS ......................................................................................................................... 32 5.1 GOVERNMENT-LED PROGRAMMES AND INITIATIVES ...................................................................................................... 32 5.2 DONOR BASED PROGRAMMES AND INITIATIVES ............................................................................................................ 32 6. GAPS AND BARRIERS CONSTRAINING CLIMATE-RESILIENT DRINKING WATER PROVISION ............................... 35 6.1 GAPS IN GEOGRAPHICAL COVERAGE .......................................................................................................................... 35 6.2 CHALLENGES IN WATER SUPPLY ................................................................................................................................ 36 6.2.1 Salinity in Groundwater ............................................................................................................................. 37 6.2.2 Rainfall Pattern .......................................................................................................................................... 37 6.2.3 Natural Hazards and Tidal Surges .............................................................................................................. 37 7. PROPOSED CLIMATE RESILIENT TECHNOLOGIES ............................................................................................... 39 7.1 JUSTIFICATION OF NEEDS, CLIMATE RESILIENCE OF SUGGESTED INTERVENTIONS ................................................................. 39 7.2 OPTIONS ANALYSIS BACKGROUND ............................................................................................................................. 40 4 7.2.1 Shallow Tube Well (STW) ........................................................................................................................... 41 7.2.1.1 Performance and Protection of Shallow Wells ..................................................................................................... 42 7.2.1.2 Feasibility of STW ................................................................................................................................................. 42 7.2.2 Deep Hand Tube Well (DHTW) ................................................................................................................... 43 7.2.2.1 Feasibility of DHTW .............................................................................................................................................. 44 7.2.3 Piped Water Supply (PWS) ......................................................................................................................... 45 7.2.3.1 Feasibility of PWS ................................................................................................................................................. 45 7.2.4 Rainwater