The Project on the Revision of National Irrigation Master Plan in the United Republic of Tanzania
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National Irrigation Commission Ministry of Water and Irrigation The United Republic of Tanzania The Project on the Revision of National Irrigation Master Plan in the United Republic of Tanzania Final Report Volume-II Appendixes July 2018 Japan International Cooperation Agency (JICA) Nippon Koei Co., Ltd. RD International Development Center of Japan Inc. JR 18-026 National Irrigation Commission Ministry of Water and Irrigation The United Republic of Tanzania The Project on the Revision of National Irrigation Master Plan in the United Republic of Tanzania Final Report Volume-II Appendixes July 2018 Japan International Cooperation Agency (JICA) Nippon Koei Co., Ltd. International Development Center of Japan Inc. The Project on the Revision of National Irrigation Master Plan in the United Republic of Tanzania Final Report The Project on the Revision of National Irrigation Master Plan in the United Republic of Tanzania Final Report Volume-II: Appendixes List of Appendixes Appendix A Hydrology and Water Resources Management Appendix B Site Investigation Report Appendix C Irrigation Human Resources Development Plan Appendix D Atlas i The Project on the Revision of National Irrigation Master Plan in the United Republic of Tanzania Final Report Appendix A Hydrology and Water Resources Management The Project on the Revision of National Irrigation Master Plan in the United Republic of Tanzania Final Report The Project on the Revision of National Irrigation Master Plan in the United Republic of Tanzania Final Report Appendix A: Hydrology and Water Resources Management Table of Contents Page Chapter 1 Introduction ....................................................................................................................... A-1-1 1.1 Objectives of Study on Water Resources................................................................................. A-1-1 1.2 Outline of the Water Resources Assessment in NIMP2002 .................................................... A-1-1 1.3 Basin and Sub-basin Boundary ............................................................................................... A-1-3 1.4 Discussions with Relevant Organizations ............................................................................... A-1-4 Chapter 2 Present Conditions of Water Resources Sector ............................................................... A-2-1 2.1 Natural Conditions .................................................................................................................. A-2-1 2.1.1 Geographical Features ......................................................................................................... A-2-1 2.1.2 Hydrometeorological Features ............................................................................................ A-2-2 2.1.3 Macroscopic Water Balance in the Country ........................................................................ A-2-5 2.2 Relevant Policies and Strategy ................................................................................................ A-2-6 2.3 Existing Plans and Studies ...................................................................................................... A-2-7 2.3.1 IWRMDP ............................................................................................................................ A-2-7 2.3.2 Other Studies related to Water Resources .......................................................................... A-2-11 2.4 Water Resources Structures ................................................................................................... A-2-13 2.5 Water Resources Management at Basin Level ...................................................................... A-2-14 2.5.1 Field Survey ...................................................................................................................... A-2-14 2.5.2 Findings from BWOs and Field Survey ............................................................................ A-2-15 2.6 Challenges in Water Sector.................................................................................................... A-2-16 Chapter 3 Water Resources Assessment ............................................................................................ A-3-1 3.1 Method and Procedure............................................................................................................. A-3-1 3.2 Estimation of Water Resources................................................................................................ A-3-2 3.2.1 Surface Water Resources ..................................................................................................... A-3-2 3.2.2 Groundwater Resources ...................................................................................................... A-3-6 3.3 Estimation of Water Demand ................................................................................................ A-3-10 3.3.1 Consumptive Water Use .................................................................................................... A-3-10 i The Project on the Revision of National Irrigation Master Plan in the United Republic of Tanzania Final Report 3.3.2 Environmental Flow Requirement .................................................................................... A-3-13 3.4 Assessment of Water Stress ................................................................................................... A-3-16 3.4.1 Summary of Annual Estimates .......................................................................................... A-3-16 3.4.2 Assessment based on Water Exploitation Index ................................................................ A-3-17 3.4.3 Assessment based on Annual Water Balance Calculation ................................................. A-3-18 3.5 Water Resources for Irrigation Sector ................................................................................... A-3-19 3.5.1 Allocated Water for Irrigation ........................................................................................... A-3-19 3.5.2 Potential Water for Irrigation ............................................................................................. A-3-23 3.6 Supplemental Study on Reliability of Water Utilization ....................................................... A-3-26 Chapter 4 Recommendations to MoWI ............................................................................................. A-4-1 4.1 Recommendations toward Implementing the NIMP2018 ....................................................... A-4-1 4.2 Recommendations for Better Water Resources Management ................................................. A-4-1 List of Tables Page Table 1.2.1 Summary of Water Potential in Major Viewpoints .......................................................... A-1-2 Table 1.3.1 Basic Information of Nine Basins ................................................................................... A-1-3 Table 1.4.1 Major Discussions with Relevant Organizations ............................................................. A-1-4 Table 2.1.1 Basic Information of the Selected Gauging Stations ....................................................... A-2-4 Table 2.1.2 Macroscopic Water Balance by Basin ............................................................................. A-2-5 Table 2.3.1 Status of IWRMDP Formulation in Nine Basins ............................................................ A-2-8 Table 2.3.2 Status of Available Reports for NIMP2018 ..................................................................... A-2-8 Table 2.3.3 Basic Conditions of Water Balance Calculation .............................................................. A-2-9 Table 2.4.1 Nos. and Reservoir Capacity of Existing Dams ............................................................ A-2-14 Table 2.5.1 Facilities Surveyed during Field Visit ........................................................................... A-2-14 Table 3.2.1 Consideration of Climate Change in the Re-generated Runoff Data ............................... A-3-3 Table 3.2.2 Mean Monthly Surface Runoff by Basin for 2015 .......................................................... A-3-3 Table 3.2.3 Mean Monthly Surface Runoff by Basin for 2025 .......................................................... A-3-5 Table 3.2.4 Mean Monthly Surface Runoff by Basin for 2035 .......................................................... A-3-5 Table 3.2.5 Calculation Basis for Sustainable Yield .......................................................................... A-3-9 Table 3.2.6 Annual Recharge and Sustainable Yield .......................................................................... A-3-9 Table 3.3.1 Annual Environmental Flow Requirement by Basin for 2015 ...................................... A-3-16 Table 3.4.1 Summary of Annual Water Resource and Water Demand by Basin for 2015 ............... A-3-17 Table 3.4.2 Summary of Annual Water Resource and Water Demand by Basin for 2025 ............... A-3-17 Table 3.4.3 Summary of Annual Water Resource and Water Demand by Basin for 2035 ............... A-3-18 Table 3.5.1 Annual Water Balance by Sub-basin for Pangani Basin ................................................ A-3-20 Table 3.5.2 Annual Water Balance by Sub-basin for Wami/Ruvu Basin ......................................... A-3-21 Table 3.5.3 Annual Water Balance by Sub-basin for Lake Victoria Basin ....................................... A-3-21 ii The Project on the