Water Cycle Infill Development Tutorial

Instructions

As part of its functionality, the Scenario Tool models the performance of different urban form scenarios through the lens of the urban heat island effect – residential subdivision, or more broadly infill development, falls within this scope. The tool has multiple ways of simulating infill development, with units, townhouses and apartments all being able to be characterised by the model. The rate at which these housing typologies are generated is a factor of a region’s population projections and planning regulations. In this seminar, we distribute new households into different land use zones on the basis of future infill development, producing a change in the residential urban form and allowing us to quantify the impact this has on urban heat metrics.

_images/infill_group.png

The tutorial will use the land surface temperature model and water balance model to

  1. Assess the current urban water balance

  2. Assessment of the impacts of urban development in a sub catchment and potential mitigation strategies

Note: none of the data or modelling specifications included within this training exercise are reflective of any real-world initiatives by government authority or any other organisation.

Preparation

Before beginning, use the link to this Dropbox folder to access the GIS files employed as part of this case study and download them to your computer.

To start, navigate to https://staging.wsc-scenario.org.au/ and click on ‘Register’ if you haven’t done so yet (note: you’ll have to re-register for the tool here if you had previously registered for an older iteration of the tool).

Log in using your registration details. You will be taken to the project dashboard – hit the plus button to bring up the new project setup window. Enter a name for your project, and select Melbourne from the dropdown menu for your region. Then click ‘Next’.

Urban Water Cycle

Model Setup

  1. Create a new project and select the Melbourne Region

  2. Select a simple data model

  3. Select the assessment models in following order
    • Land Surface Temperature

    • Water Cycle Model

  4. Upload boundary provided in the data pack

  5. Confirm and submit the simulation. Note the area is quite large and the model will take about 10min to setup

_images/initialised_model.png

Business as usual 2051

Setting Up a Scenario

For this seminar we will simulate an increase of the population by 40% or 3.200 or 1300 households.

The population will be distributed in the GRZ and NRZ simulating typical development patterns for Melbourne. (see below)

NRZ

Development Type

Additional Households

Side by Side

200

Townhouse

300

GRZ

Development Type

Additional Households

Side by Side

200

Townhouse

400

Apartment

200

We will explore 3 scenario

  • A BAU scenario without water reuse

  • A RWHT scenario with 50% of the new developed lots installing a RWHT

  • A SWH scenario using stormwater runoff to provide water to the sporting oval

BAU

First, upload the NRZ and GRZ zoning provided in the data pack. Next, create a new BAU scenario and add the following nodes. You can find the nodes under the Urban From tab.

  • Parent scenario: Baseline

  • Workflow node: Side by Side
    • Area: NRZ

    • additional households: 200

    • hard stand fraction: 0.6

  • Workflow node: Townhouse
    • Area: NRZ

    • additional households: 300

    • hard stand fraction: 0.6

  • Workflow node: Side by Side
    • Area: GRZ

    • additional households: 200

    • hard stand fraction: 0.6

  • Workflow node: Townhouse
    • Area: GRZ

    • additional households: 400

    • hard stand fraction: 0.6

  • Workflow node: Apartment
    • Area: GRZ

    • additional households: 200

    • hard stand fraction: 0.6

_images/infill_dev_01.png

RWHT

Setup a new scenario derived from BAU

To be able to assign a RWHT to 50% of the newly developed buildings create a new Lot template. Set the fraction to 50% and the build year to 2020. This means that 50% of the new lots will be assigned a new template ID 2. To add the storages us the Lot Scale Storage node as shown below.

  • Parent scenario: BAU

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

    • fraction of lots: 0.5

    • built year: 2020

  • Workflow node: Lot Scale Storage
    • Area: Case Study

    • Template ID: 2

    • Inflow: roof runoff

    • Demand Priority 1: non potable demand

    • Demand Priority 2: outdoor demand

    • Demand Priority 3: -

    • Storage Volume (m3): 5

SWH

Setup a new scenario derived from BAU and assign. To setup the SWH system add 2 new areas one defining the harvesting catchment the other defining the oval (see below)

_images/sporting_oval.png

For the setup the outdoor demand needs to be made available at lot scale. Therefore create new lot template And assign the outdoor demand to outdoor demand. Now the sub catchments and storages can be defined as shown below.

  • Parent scenario: BAU

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

    • fraction of lots: 1

    • outdoor demand -> : outdoor demand

    • All other values are default

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

    • Stream: storm water

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

    • Stream: outdoor 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: 50

Viewing the Results

After the scenarios have been executed explore the impacts of the 3 different scenarios.