Botswana Training Workshop June 2024
  • Tutorial 3: Planning for water resilience in Botswana.
    • Introduction
    • Botswana National Water Resource System Model (Training version)
    • Baseline system performance
    • Activating the Chobe-Zambezi Transfer
    • Implementing the Walvis Bay transfer
    • Implementing the Lesotho Highlands Transfer
    • Reducing Non-Revenue Water
      • Calculating domestic demand within the model
      • Implementing a NRW demand loss reduction
    • Implementing the Chobe and NRW losses reduction
    • Additional exercises
  • Tutorial 4: Adding new infrastructure in the Botswana national model
    • Adding Mosetse dam
    • Adding a demand
    • Adding a water treatment works with losses
    • Adding a source representing groundwater
    • Additional Exercises
  • Tutorial 5: More advanced modelling
    • Background on Evaporation and Precipitation on Reservoirs
    • Adding reservoir bathymetry (Area)
    • Adding reservoir bathymetry (Level)
    • Adding monthly evaporation and rainfall
  • Tutorial 6: Allocation penalties
    • Exercise 1a Two nodes
    • Exercise 1b Two demands
    • Exercise 1d Minimum Flow Properties
    • Exercise 2a Simple system with reservoir draw downs
    • Exercise 2b Simple system with overflow
  • Tutorial 7: Additional exercises with allocation penalties and control curves
    • Additional exercises using allocation penalties and control rules
    • Exercise to implement demand reductions when reservoirs levels are low
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On this page
  • Create a new model
  • Set Up Time Horizon
  • Adding Nodes
  • Adding Edges
  • Add flow input node and Run the network
  • Explanation
  • Add priority to the output node and Run The network
  • Explanation
  • Add required flow to the output node and Run The network
  • Explanation
  1. Tutorial 6: Allocation penalties

Exercise 1a Two nodes

PreviousTutorial 6: Allocation penaltiesNextExercise 1b Two demands

Last updated 7 months ago

Create a new model

Ceate a new network called Exercise 1a using the following template:

Pywr child template v1 (March 2021) - flow units in Mm3/day

Follow the instrucions here for a reminder on how to set up the model:

https://water-strategy.gitbook.io/botswana-training-workshop-june-2024/tutorial-6-allocation-penalties

Set Up Time Horizon

This step is mandatory for all networks as it defines the simulation's start, end, and timestep. For this example, we will configure a 1-year simulation horizon with a daily timestep.

Adding Nodes

Navigate to the left panel and click on Build to open the Nodes list.

Drag and drop to the workspace Map:

Note: To learn more about different node types, refer to the documentation here.

Adding Edges

To create a connection between nodes, first click on the input node and then click on the output node. Edges are directional, and the direction is set from the first to the second node.

Add flow input node and Run the network

Double-click on the input node. This will open the node panel on the right side of the screen.

Node Panel Sections:

  • Details: Here, you can change the name and description of the node.

  • Inputs: This section contains the basic attributes that need to be configured for each node. These attributes are user-defined.

  • Outputs: This section displays the results after the simulation.

Select the input node and change max_flow to 10.

A new window will pop-up, click on Submit

Wait until the Runs panel shows a green indicator for successful execution.

The following plots are the results generated by the network

Explanation

The input node acts as a water supply source, providing a maximum of 10Mm³/day, according to the demand required, as the output node doesn’t have an allocation penalty associated, then no water supply is required.

Add priority to the output node and Run The network

Select the output node and change allocation penalty to -10. A negative value sets up a higher priority for the node. For more information on allocation penalties, refer to the Allocation Penalty documentation

Run the model and visualize the results as described on the previous step

Explanation

The input node acts as a water supply source, providing a maximum of 10Mm³/day.

The allocation penalty in the output node is set to a negative value (-10), prioritizing the allocation of water to this node, with no constraint on maximum flow, the output node can consume as much water as the network can supply to it.

Add required flow to the output node and Run The network

Select the output node and change max_flow to 6Mm³/day, it tells the network which is the required consumption for this output node.

On the left panel click on Run a Model . Run the model and visualize the results as described previously

Explanation

The input node acts as a water supply source, providing a maximum of 10Mm³/day.

The allocation penalty prioritizes the allocation of water to the output node, a constrain to maximum 6Mm³/day withdrawal has been added, now the output only gets the constrained 6Mm³/day a maximum supply of the requested demand.

· 1 input node

· 1 output node

Click on edge to activate “link mode”.

Click again on edge to deactivate “link mode”.

On the left panel Click on Run a Model .

To visualize the supplied flow from the input, click on the input node and then click on the icon for the attribute simulated_flow

To visualize the supplied flow to the output, click on the output node and then click on the icon for the attribute simulated_flow

On the left panel click on Run a Model .