Implementation of the Water Resources Classification System and Determination of the Resource Quality Objectives for Significant Water Resources in the.

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Presentation transcript:

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

Letaba NWRCS steps 2 7: Gazette class configuration 6: Resource Quality Objectives (EcoSpecs & water quality (user)) 5: Stakeholder process 4: Identification and evaluation of scenarios within IWRM 3: Quantify EWRs and changes in EGSA 2: Initiation of stakeholder process and catchment visioning 1: Delineate units of analysis and describe the status quo Scenario Analysis: Where does it fit in?

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

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

Evaluation of Scenarios Scenario Description Assign attributes to EWR nodes Water Availability Analysis Estimate Consequences Rank and optimise Formulate Alternative Scenarios Select Scenario Subset Stakeholder Evaluation Entry Ecological EGSA Economical Non-Ecological Water Quality Ecological EGSA Economical Non-Ecological Water Quality

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

Water Resources Network Model Magoebaskloof Vergelegin Hans Merensky 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

Middel & Klein Letaba Catchment (Reconciliation Strategy: April 2012) MKL1: Water Conservation & Water Demand Management. MKL2: Development of groundwater resource. MKL3: Replacement of Middel Letaba canal with pipeline. MKL4: Transfer Scheme from Nandoni Dam. MKL5: Construction of new dam on Klein Letaba River: – Majosi Dam – Crystalfontein Dam 11

Middel and Klein Letaba

Scenarios in context of IUAs 13 Letaba u/s Tzaneen Dam Approved: Groot Letaba River Water Development Project : Raising of Tzaneen Dam Applications: -Abstraction to Polokwane -Politsi Scheme Letaba u/s Tzaneen Dam Approved: Groot Letaba River Water Development Project : Raising of Tzaneen Dam Applications: -Abstraction to Polokwane -Politsi Scheme Letsitele and Thabina Option for evaluation, Letsitele River Valley Dam Letsitele and Thabina Option for evaluation, Letsitele River Valley Dam Letaba d/s Tzaneen Dam to Proposed Nwamitwa Dam Approved: Groot Letaba River Water Development Project : Nwamitwa Dam Letaba d/s Tzaneen Dam to Proposed Nwamitwa Dam Approved: Groot Letaba River Water Development Project : Nwamitwa Dam Molatotsi River Option for evaluation, Artificial aquifer recharge at Mulele. Molatotsi River Option for evaluation, Artificial aquifer recharge at Mulele.

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

Summary of scenarios

Comments and Discussion