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 RooyenModified by and presented by: Delana Louw17 March 2014

2

NWRCS integrated steps

7: Gazette class configuration

6: Resource Quality Objectives (EcoSpecs & water quality (user))

5: Draft Management Classes

4: Identification and evaluation of scenarios within IWRM

3: Quantify EWRs and changes in Ecosystem Services

2: Initiation of stakeholder process and catchment visioning

1: Delineate units of analysis and describe the status quo

Evaluating scenarios and determining MC

NWRCS integrated steps

1. Status quo, IUA delineation

3. Quantify EWRs & links to EGSA

4. Recommend Scenario & MC

6. RQO

PSC 1

THIS PSC 2 MEETING

4. ID Scenarios

PSC 3

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 & MCsThe 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 anddetermining 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

6

Catchment Analysis

Ecological Water

Requirements

Socio-EconomicWater Requirements

Catchment Resource Availability

Catchment Resource Availability

Protection

Management Class (Decision)

Use

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 scenarioNWRC is the process to evaluate and recommend what that scenario entails

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Scenario evaluation and MCChallenges: 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

Economic Implications

Ecosystem Services

Ecological health

Water Resource System

Integrated Units of Analysis

River Reaches

Biophysical Nodes

Elements Variables

Scenario Assessment

(Resource Unit)

Scenario Evaluation Process

Scenario Description

WaterAvailability

Analysis

Estimate consequences

Compare, rank & optimise

scenarios

Formulate Alternative Scenarios

Select relevant

scenarios

Stakeholder Evaluation

Vision

EcologicalEcosystem Services

EconomicsNon-Ecological Water Quality

Status quo

information.

Identify components

and metrix relevant

for scenario

assessment.

Scenario steps

Information feeding into the process

Evaluate against vision

Evaluation and analysis steps

For each reach / node For IUA / system

Relative importance

Degree of meeting REC

Weighting process

Prevailing situation

Relative to base condition

Weighting process

Makeup of economy

Weighting process

Score

Score

Score

For all scenarios

Relative to present provisions

Inte

grat

ed C

ompa

rison

(all

varia

bles

)

Multi-criteria assessment method

Consequences

FishPhysico-chemical

Geomorphology

Macroinvertebrates

Riparian vegetation

ECOLOGICAL STATE

Culture

Regulating

Riparian vegetationFood, Fuel

ECOSYSTEM SERVICES

Consequences

Jobs

GDP

ECONOMY

Scenario Comparison Visualisation

1 2 3 4 5 6

PES

REC

5

6

910

1.0 2.0 3.0 1.0 2.0 3.0 1.0 2.0 3.0

PES

REC

5

6

910

1.0 2.0 3.0

PESREC

5

6

9

10

1.0 2.0 3.0

Ecological Status

relative to REC

EcosystemServices

Economic Indicator Employment

0.5 0.05 0.2 0.25

Overall Ranking (Rank Order)

Deriving the Management Class

IUAScenarios and Management Class

PES REC 1 2 3 41 II II III III III III2 III III III III III III3 III II III III III III4 II II III III III III5 I I I I I I

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.