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Implementation of Water Resources Classification and Quality Objectives in Letaba Catchment

This document outlines the preliminary operational scenarios for implementing the Water Resources Classification System (NWRCS) in the Letaba Catchment. It discusses scenario analysis within water resource management, evaluating various factors affecting water balance and quality. The evaluation aims to find a balanced scenario for water use and protection, highlighting ecological, economical, and socio-economic impacts. Various options for water supply infrastructure and groundwater management are presented, providing a roadmap for sustainable water resource management in the region.

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Implementation of Water Resources Classification and Quality Objectives in Letaba Catchment

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  1. Implementation of the Water Resources Classification System and Determination of the Resource Quality Objectives for Significant Water Resources in the LetabaCatchment 9: Preliminary operational scenarios 31 October 2013 Presented by: Pieter van Rooyen

  2. Letaba NWRCS steps Scenario Analysis: Where does it fit in?

  3. What are scenarios? • Scenarios, in context of water resource management and planning are plausible definitions (settings) of all the factors (variables) that influence the water balance and water quality in a catchment and the system as a whole

  4. What are scenarios used for? • Different levels of water use and protection are evaluated with the aim to find a balanced scenario • Water Resource Classification is the process to evaluate and recommend what that balance scenario entails

  5. Evaluation of Scenarios • Ecological • EGSA • Economical • Non-Ecological Water Quality

  6. Catchment Analysis Catchment Resource Availability Socio-Economic Water Requirements Ecological Water Requirements Use Protection Management Class (Decision)

  7. Magoebaskloof Water Resources Network Model Hans Merensky Vergelegin Tzaneen Thabina Noord Canal NN Canal

  8. Groot Letaba Catchment Options(Reconciliation Strategy: April 2012) • GL1: Raising of Tzaneen Dam. • GL2: Construction of Nwamitwa Dam. • GL3: Bulk Water Supply Infrastructure from Nwamitwa Dam. • GL5: Artificial recharge at Mulele on Molototsi River. • GL6: Groundwater regional scheme in conjunction with surface scheme.

  9. Groot and Klein Letaba

  10. Middel & Klein Letaba Catchment(Reconciliation Strategy: April 2012) • MKL1: Water Conservation & Water Demand Management. • MKL2: Development of groundwater resource. • MKL3: Replacement of MiddelLetaba canal with pipeline. • MKL4: Transfer Scheme from Nandoni Dam. • MKL5: Construction of new dam on Klein Letaba River: • Majosi Dam • Crystalfontein Dam

  11. Middeland Klein Letaba

  12. Scenarios in context of IUAs • Molatotsi River • Option for evaluation, Artificial aquifer recharge at Mulele . • Letaba u/s Tzaneen Dam • Approved: Groot Letaba River Water Development Project : Raising of Tzaneen Dam • Applications: • Abstraction to Polokwane • Politsi Scheme • Letaba d/s Tzaneen Dam to Proposed Nwamitwa Dam • Approved: Groot Letaba River Water Development Project : Nwamitwa Dam • Letsitele and Thabina • Option for evaluation, Letsitele River Valley Dam

  13. Klein Letaba u/s Middel Letaba Dam • Option for evaluation: CrystalfonteinDam and conveyance infrastructure • Klein Letaba d/s Middel Letaba Dam • Pipeline to replace canal, reducing losses Scenarios in context of IUAs

  14. Summary of scenarios

  15. Summary of scenarios

  16. Comments and Discussion

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