Classification of water resources and and Resource Quality Objectives in the Inkomati Catchment Methodology to way up the level of protection against water use towards finding the desirable balance and Management Class Original presentations and development of model: Pieter van Rooyen Modified by and presented by: Delana Louw 17 March 2014
NWRCS integrated steps Evaluating scenarios and determining MC
NWRCS integrated steps 1. Status quo, IUA delineation PSC 1 3. Quantify EWRs & links to EGSA THIS PSC 2 MEETING 4. ID Scenarios 4. Recommend Scenario & MC PSC 3 6. RQO
Step 4 and 5: IWRM & MCs NWRCS facilitates finding a balance between protection and use of the water resource. This process takes place during Step 4 and 5. This study is now at the start of this process. What needs to be balanced? Degree of the ecological health / status and socio-economics (Ecosystem services & Economic implications)
Step 4 and 5: IWRM & MCs The process of finding a balance is facilitated by assessing different future levels of water resource use. Different levels of water resource use are assessed by means of evaluating a range of possible future scenarios and determining the consequences of these scenarios on users and the environment. Aim is to design an optimised scenario that would result in an acceptable balance. Scenario links to MC and Catchment Configuration
Catchment Analysis Catchment Resource Availability Socio-Economic Water Requirements Ecological Water Requirements Use Protection Management Class (Decision)
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 (System’s context) Different levels of water use and protection are evaluated with the aim to find a preferred scenario NWRC is the process to evaluate and recommend what that scenario entails
Scenario evaluation and MC Challenges: Integration Node / reach / river to catchment scale Ecosystem status/health (non-monetary) versus Socio-economics (non-monetary and monetary Management Class decision suport system or tool based on multi-criteria decision analysis approaches have been developed. The scenario evaluation process and integration fits within this approach.
Integrated Assessment of Scenarios Elements Variables (Resource Unit) Scenario Assessment
Scenario Evaluation Process Status quo information. Identify components and metrix relevant for scenario assessment. Vision Scenario Description Formulate Alternative Scenarios Select relevant scenarios Stakeholder Evaluation Ecological Ecosystem Services Economics Non-Ecological Water Quality Evaluate against vision Compare, rank & optimise scenarios Water Availability Analysis Information feeding into the process Estimate consequences Evaluation and analysis steps Scenario steps
Multi-criteria assessment method Geomorphology Physico-chemical Fish For all scenarios For each reach / node For IUA / system Macroinvertebrates Riparian vegetation Consequences Relative importance ECOLOGICAL STATE Weighting process Score Degree of meeting REC Prevailing situation Integrated Comparison (all variables) Weighting process Score Culture Regulating Food, Fuel Riparian vegetation Relative to present provisions ECOSYSTEM SERVICES Makeup of economy Jobs Weighting process Score GDP Consequences ECONOMY Relative to base condition
Scenario Comparison Visualisation • Focus of the rest of the balance methodology presentation is to show how each of the variables come up with the individual ranking order and scoring PRIOR to integration • Note, the catchment used is COMPLETELY HYPOTHETICAL and representative of a typical catchment. The results also – this is just a demonstration and is intended to prepare you for providing input when the scenario evaluation is complete. • Only aspect of this process undertaken during THIS PSC meeting is the input on the scenarios to be evaluated.