Training Seminar 6 - Truganina

Session Information

Case Study Site: Truganina, Victoria

Recorded on Thursday 6 February 2020 | 12pm ADST

Updated 24/05/2020

Instructions

The Truganina precinct has been adopted as part of the focus area for a recent Scenario Tool case study. The purpose of this case study is to consider how specific interventions of urban form and water servicing in greenfield development areas can support the delivery of integrated water management outcomes. The rapid transformation of Melbourne’s west is impacting on the water cycle of this region, and there is keen interest amongst government stakeholders to investigate how strategic changes to urban planning and development may help to resolve challenges the regional water balance is facing due to population growth and climate change.

The Truganina PSP describes the vision for Truganina and ensures the delivery of key local infrastructure to promote accessibility and community activity within the precinct. In this seminar, we will use part of the Truganina PSP with the Scenario Tool to model the urban water cycle for the specified area of mixed land uses and quantify the potential reduction in water sourced from the water supply system as a result of the implementation of various alternative water sources. In total, five scenarios will be produced: the baseline conditions detailing the current state of pre-developed Truganina, a business-as-usual case reflecting the proposed development of Truganina owing to existing planning policies and schemes, and three intervention scenarios that each feature different alternative water source systems.

Truganina - Urban Water Cycle

Model Setup

  1. Before beginning, use this Dropbox folder to access the GIS data employed as part of this seminar

  2. To start, navigate to the Scenario Tool website and log in using your registration details (otherwise register for the tool and then proceed to log in)

  3. At the project dashboard, create a new project, name it, and set the region to Melbourne

  4. Select the land surface temperature and water balance modules

  5. Upload the boundary file that is part of the GIS dataset previously referred to

  6. Submit the project to initialisation it

  7. Upload the remaining GIS files after reaching the project dashboard

Scenario 1 - BAU

This scenario represents the business-as-usual approach, incorporating a mix of different land uses and serving as the case that will be subjected to the implementation of alternative water source schemes.

Note

The nodes, their parameters and the GIS layers used with them have been informed from a combination of relevant literature and government authority input. As part of this seminar, the specific documentation for each node should be read to gain an understanding of its function and the resources used to calibrate it.

To prepare the business-as-usual scenario, begin with the ‘Clear Area’ node and add ‘Residential’ node, using the ‘residential.geojson’ file as the area of effect and the parameter set below; then, follow the relevant table to set up the rest of the scenario. urban_form_bau shows the outputs for the urban from and land surface temperature accross the case study area

Workflow Node

Create Lot

Create Lot

Create Lot

Area

Recreational Reserve

Road

Other Pervious Area

Employee/student count

0

0

0

Tree Cover

0

0

0

Water Cover

0

0

0

Grass Cover

0

0.25

0.9

Irrigated Grass Cover

1.0

0

0

Roof Cover

0

0

0

Road Cover

0

0.5

0

Concrete Cover

0

0.25

0.1

_images/urban_form_bau.png

Urban form and Land Surface Temperature for the BAU scenario

Scenario 1 - RWHT

The first intervention scenario centres on rainwater harvesting, with residential lots now gaining access to rainwater for non-potable and out door reuse. Therefore, the residential properties need to be assigned a new lot template.

  • Parent scenario: BAU

  • Workflow node: Lot Template (This will create the lot template with the ID 2)
    • Area: Residential

    • fraction of lots: 1

    • All other values are default

  • Workflow node: Lot Scale Storage
    • Area: Residential

    • Template ID: 2

    • Inflow: roof runoff

    • Demand Priority 1: non potable demand

    • Demand Priority 2: outdoor demand

    • **Demand Priority 3: - **

    • **Storage Volume (m3): 5 **

_images/lot_template_ids.png

Lot template IDs in the catchment.

Scenario 2 - Water Recycling

The first intervention scenario centres on a water recycling system, which collects wastewater from the entirety of the case study’s population and supplies it as reclaimed water to all industrial lots. To do so 2 sub catchments are added to the model. The first sub catchment will collect waste water from the residential area and the 2nd will define the industrial zone as reclaimed water zone.

  • Parent scenario: BAU

  • Workflow node: Sub Catchment (This will create the sub catchment with the ID 10)
    • Area: Residential

    • Stream: sewerage

  • Workflow node: Sub Catchment (This will create the sub catchment with the ID 11)
    • Area: Industrial

    • Stream: potable demand

  • Workflow node:Sub Catchment Storage
    • Area: Case study area

    • Inflow ID: 10

    • Demand ID Priority 1: 11

    • **Demand ID Priority 2: - **

    • **Demand ID Priority 3: - **

    • **Storage Volume: 500 **

Scenario 3 - Water Recycling + RWHT

The second intervention builds off the first, with residential lots now gaining access to rainwater for non-potable reuse.

  • Parent scenario: Water Recycling

  • Workflow node: Lot Template (This will create the lot template with the ID 2)
    • Area: Residential

    • fraction of lots: 1

    • All other values are default

  • Workflow node: Lot Scale Storage
    • Area: Residential

    • Template ID: 2

    • Inflow: roof runoff

    • Demand Priority 1: non potable demand

    • Demand Priority 2: outdoor demand

    • **Demand Priority 3: - **

    • **Storage Volume (m3): 5 **

Results

You should have access to tiles depicting: the location and duration of the precipitation time series data used within the modelling; water demands; water being recycled within the project area’s water supply system; and the overall water balance of the catchment. The bar graphs comprising the tiles will allow you to witness how the different scenarios compare in terms of the various elements of the urban water cycle.

_images/lot_scale_inflow.png

Lot scale inflow

_images/lot_scale_outflow.png

Lot scale out flow

_images/lot_scale_outflow.png

Lot scale out flow

_images/sub_catchment_outflow.png

Sub catchment inflow

_images/sub_catchment_inflow.png

Sub catchment outflow