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Integrated Water Resources Management Plans for the Maputo and Incomati River Basins

Integrated Water Resources Management Plans for the Maputo and Incomati River Basins Programme: PRIMA - Progressive Realisation of the IncoMaputo Agreement Tripartite Permanent Technical Committee (TPTC) Lead Consultant: Aurecon. 1/3 of the World’s major international river basins

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Integrated Water Resources Management Plans for the Maputo and Incomati River Basins

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  1. Integrated Water Resources Management Plans for the Maputo and Incomati River Basins Programme: PRIMA - Progressive Realisation of the IncoMaputo Agreement Tripartite Permanent Technical Committee (TPTC) Lead Consultant: Aurecon

  2. 1/3 of the World’s major international river basins • 93% of the total African water resource • 77% of the Continent’s population Trans-Boundary Water Management in Africa Africa’s 63 trans-boundary river basins account for:

  3. Maputo Basin

  4. IncomatiBasin

  5. Background to PRIMA • In 1986 the Governments of Moçambique, South Africa and Swaziland signed an “Accord” to seek the cooperative management of their shared water resources in the Maputo and Incomati River Basins. • Maputo River Basin: Area – 30 000km2; natural MAR – 3 600 million m3/a; existing storage in basin – 90% MAR • Incomati River Basin: Area - 47 000 km2 ; natural MAR - 3 500 million m3/a; existing storage in Basin - 60% of MAR • In 2002 the Interim IncoMaputo Agreement (IIMA) on water sharing was signed , but implementation slow & limited • In 2009 the Parties initiated PRIMA - “Progressive Realisation of the IncoMaputo Agreement ”. Its primary objective is to support the Parties in implementing the IIMA.

  6. Objective of this IWRM Project under PRIMA • Develop Integrated Water Resources Management Plans for the Incomati and Maputo River Basins (one Plan for each basin), • which will enable the three countries to establish final Comprehensive Agreements to follow the current Interim Incomati-Maputo Agreement - IIMA • which will aim to ensure the protection and sustainable utilisation of the water resources of the two Basins.

  7. Process for developing IWRM Plan Phase 1

  8. Process for developing IWRM Plan Phase 2

  9. Maputo Basin Development Projects

  10. Maputo Basin – Baseline and Development Scenarios 1, 2, 3 and 4 Current-Day 1:50 Year (98% Assurance) System Yield Baseline Water Requirement (Current-Day)

  11. Stochastic System Modelling of Each Intervention’s Contribution to Maputo Basin System Yield • Configuration of complete Maputo system of sub-catchments, dams, abstractions in a monthly network model of input/output nodes and inter-connecting channels • 55 input nodes provide 77 years each of naturalised system streamflows, previously simulated by calibrated rainfall-runoff sub-catchment models • Water allocations and operating rules controlled by penalty structures • Stochastic inflow sequences generated by a 55-D ARMA (n,p) model that preserves serial cross-correlations between all pairs of streamflow sequences

  12. Example of a Typical Network Model Structure

  13. Scenario 1: Optimised 2011 Reference Scenario

  14. Preferred IWRM Scenario for Maputo Basin • Increase water supply to most urban areas - Swaziland • Develop irrigation projects in all three countries • Dams: Three new dams in Swaziland and two new dams in Moçambique • Operationalise all Environmental Water Requirements • Invasive Alien Plant removal programmes • Curtail all future irrigation demands by 20% • Implement 20% WC/WDM for existing irrigation

  15. Maputo Basin – Water Balance for Preferred IWRM Scenario Current-Day 1:50 Year (98% Assurance) System Yield Baseline Water Requirement (Current-Day)

  16. Final IWRM Strategies • Strategy for Resource Management and Regulation of Water Use; • Strategy for Water Resource Development; • Strategy for Water Resource Protection; • Strategy for Drought and Flood Management;

  17. Final IWRM Strategies (Cont.). • Enabling Strategies • Stakeholder engagement, incl. public awareness • Financial, • Monitoring, • Information management, • Institutional organisation and governance, • Training and capacity building.

  18. Current Steps towards Implementation of IWRM Strategies for both Basins • Tripartite Structures and their resourcing agreed, but not established • Organisations in each country responsible for implementing each element of the Plan confirmed, but necessary authority not yet delegated • IWRM Plan and Tripartite Structures still to be signed off by the Parliaments of the three countries

  19. Thank you! Upper Maputo River

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