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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  1. Tutorial 4: Adding new infrastructure in the Botswana national model

Adding a water treatment works with losses

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Last updated 7 months ago

In this section a loss link representing a potable water treatment works will be added to the system. This node is used to represent treatment losses leaving the system. Water from the reservoir is released to the water treatment works where, a proportion of this water is lost via process losses and the remaining water is then supplied to the demand.

  1. Clone the 'Mosetse demand' scenario and call the new one 'Demand with treatment losses'.

  2. Delete the link connecting the reservoir to the Mosetse demand node by right clicking on the link and clicking on 'Delete Link'

  1. This water treatment works will have 10% losses based on the outflow of the water treatment works.

  • Set the Loss Factor to be 0.1 representing 10% losses.

  • Set the Loss Factor Type to be net so that the 10% loss is calculated to the output of the treatment works.

  1. Run the scenario.

  1. Compare the simulated_volume of the reservoir in the 'With treatment losses' and the 'Mosetse demand' scenario.

The reservoir in the scenario that has treatment losses goes to lower storage during dry periods. This is because the reservoir is release more water to the demand due to the treatment losses.

Has the demand been affected by the treatment losses? Compare the simulated_flow of the Mosetse demand node under this and the Mosetse demand scenario.

Exercises and questions

  1. The water treatment works results in losses leaving the system. The simulated flow of the loss link shows the flow output of the loss link. How can we determine how much water is entering the water treatment works?

Hint: Place a normal link node in-between the reservoir and loss link and rerun the model. The simulated flow on this node will represented the flow released by the reservoir and the flow going into the treatment works before losses.

  1. In an new scenario, increase the net losses to 20%? How does this affect the reservoir simulated volume?

Place a loss link in between the reservoir and the demand and connect the reservoir to the losslink and losslink to the demand node with links. Rename the loss link to be 'Water Treatment Works'.