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South Africa PRIMA Operating Rules. Trans-boundary Operating Process. Local Water Management Authority. Operational Committee Representatives for water management institutions (WUA, CMA etc). PRIMA ,TPTC etc. Trans-boundary Agreement. Define integrated operating objectives. Model.

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Presentation Transcript
slide1

South Africa

PRIMA Operating Rules

trans boundary operating process
Trans-boundary Operating Process

Local

Water Management Authority

Operational Committee

Representatives for water management institutions

(WUA, CMA etc)

PRIMA ,TPTC etc

Trans-boundary Agreement

Define integrated operating objectives

Model

Determine operating rule

Compliance check

PRIMA

Operations

Task Team/Data Unit

Current catchment conditions

Model

Determine operations for next season

(Restrictions)

system interactions
System interactions

MIS

Super user

-Access and change everything

DSS Operator

Water use

Operator

-Access limited through GUI

Operating Rules

Dam Levels

Mike Basin

Viewer

-Access limited cannot change system information

operating rules process
Operating Rules Process
  • Define operating objective
  • Per catchment resource
  • Integrated operating objective (international and ecological requirements)
  • Short term/Compliance
  • -Compliance
  • -Operating rule
    • -Dam levels
    • -Releases
    • -Restrictions
  • -Water use (Water balance)
  • -Flows (Environmental requirement)
  • Determine operating rule
  • Per catchment/dam
  • Integrated operating rule
  • Review operating rule
  • -Determine critical period
  • Test medium term operations
    • Stochastic runs
      • Dam trajectories
      • Check assurance of supply
example developing and operating rule
Example Developing and Operating Rule

Define the operating objectives

  • Use water from run of river first then if this is not sufficient release water from Kwena Dam
  • Normal:
    • Dam level should be back above 90% the next May. An increase in dam level of more than 40% can be expected from November to May.
    • Dam level should preferably not go down below 60% but be kept above 50% as far as possible.
    • Restrictions should normally be implemented from May to October/November. Conservative approach in winter months
    • Wet season turning about November/December dam fills. Generally keep dam level to 60% at 15 December.
example developing and operating rule1
Example Developing and Operating Rule

Define the operating objectives

  • Drought:
    • Dam level should at least be back at 70% if the previous year was a drought year. Increase in dam level of 30% to 35% could be expected if it is a dry year again.
    • Dam level should not go down below 35% but preferably be kept above 40% under these conditions.
    • If it is the third or fourth year of a drought and still a dry year ahead under these conditions it is possible to go down to below 20% but not lower than 15% depending on the time of the year and the forecast.
    • In a drought we assume the turning point to be much later and we work on the end of January.
example developing and operating rule2
Example Developing and Operating Rule

Determine the operating rule

  • Normal condition
  • Choose representative hydrological sequence (50th percentile)
  • Choose a dam level and iteratively restrict users in so that we reach a level of 90% at May the next year
  • Change the dam level and repeat the process
  • Create a curve showing restriction level versus dam level for normal condition
  • Drought condition
  • Choose representative hydrological sequence (25th percentile)
  • Choose a dam level and iteratively restrict users in so that we reach a level of 70% at May the next year
  • Change the dam level and repeat the process
  • Create a curve showing restriction level versus dam level for normal condition

Two curves generated for drought and normal condition

example developing and operating rule3
Example Developing and Operating Rule

Determine the operating rule

integration
Integration

Mozambique

Wit

Crocodile

Kaap

system overview
System Overview
  • Purpose: Give good general overview of system allowing manager to identify problems quickly
  • Critical information presented on
    • Dams
    • Flows
    • Water Use
    • Missing information
slide16

System Overview (Double click on elements for more information)

Prima Operations

Home

Dams

Flows

Water use

Flow: Meets IIMA Not compliant

Water use: 0-25% 25%-50% 50%-75% 75%-100% >100%

Dam Level:

slide17

Pongolapoort Dam

Prima Operations

Home

Dams

Flows

Water use

Volume: 1 200 000 m3

Percentage full: 70%

Storage capacity: 780 000 m3

Inflow: 120 m3s-1

Release: 90 m3s-1

Time series graphs

Release comparison

Release Status

Forecasted Dam Trajectories

Comparative Dam Trajectories

slide18

Pongolapoort Dam

Prima Operations

Home

Dams

Flows

Water use

Volume: 1 200 000 m3

Percentage full: 70%

Storage capacity: 780 000 m3

Inflow: 120 m3s-1

Release: 90 m3s-1

Time series graphs

Release comparison

Release Status 1

Forecasted Dam Trajectories

Comparative Dam Trajectories

slide19

Pongolapoort Dam

Prima Operations

Home

Dams

Flows

Water use

Volume: 1 200 000 m3

Percentage full: 70%

Storage capacity: 780 000 m3

Inflow: 120 m3s-1

Release: 90 m3s-1

1 month

average

3 month

average

Time series graphs

Release comparison

Release Status 2

Forecasted Dam Trajectories

Comparative Dam Trajectories

slide20

Pongolapoort Dam

Prima Operations

Home

Dams

Flows

Water use

Volume: 1 200 000 m3

Percentage full: 70%

Storage capacity: 780 000 m3

Inflow: 120 m3s-1

Release: 90 m3s-1

Time series graphs

Release comparison

Release Status

Forecasted Dam Trajectories

Comparative Dam Trajectories

slide21

Pongolapoort Dam

Prima Operations

Home

Dams

Flows

Water use

Volume: 1 200 000 m3

Percentage full: 70%

Storage capacity: 780 000 m3

Inflow: 120 m3s-1

Release: 90 m3s-1

Time series graphs

Release comparison

Release Status

Forecasted Dam Trajectories

Comparative Dam Trajectories

slide22

Pongolapoort Dam

Prima Operations

Home

Dams

Flows

Water use

Volume: 1 200 000 m3

Percentage full: 70%

Storage capacity: 780 000 m3

Inflow: 120 m3s-1

Release: 90 m3s-1

Time series graphs

Release comparison

Release Status

Forecasted Dam Trajectories

Comparative Dam Trajectories

slide23

Prima Operations

Home

Dams

Flows

Water use

Komatipoort Weir

slide24

Prima Operations

Home

Dams

Flows

Water use

Water use information can be incorporated into the system

However

Existing water use data is not reliable and methodology for the collection of this information is not well established. Many areas no water meters are available and assessments based on remote sensing information tend to be inaccurate.

slide25

Prima Operations

Home

Dams

Flows

Water use

Idea for identification of water use

Run a water balance

Loss/Gain = Upstream gauge + Tributaries (n) – Downstream gauge – estimated evaporation – Estimated seepage

Loss/gain vs Allocation