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Urban Nutrient Decision Outcomes (UNDO)

website·Indexed 35 days ago

https://undo-docs.dwer.wa.gov.au

A conceptual decision support tool for managing nutrient export in urban developments in Western Australia. The tool provides modules for project setup, export configuration, and structural treatments—such as biofilters, constructed wetlands, and swales—to calculate nutrient removal and size engineering structures.

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What's inside UNDO

  1. Overview of structural treatments in the UNDO tool

    The UNDO tool's treatment page allows users to input structural treatments to calculate nutrient removal. Users can size these structures, link them to specific subregions, and organize them into a 'treatment train' (sequential treatments). The available structural treatments include:

    • Biofilters (bioretention systems)
    • Constructed wetlands
    • Swales
    • Living streams
    • Infiltration/detention basins
    • Floating treatment wetlands
    • Spiral-wrapped media filters

  2. Overview of Urban Nutrient Decision Outcomes (UNDO)

    Urban Nutrient Decision Outcomes (UNDO) is a conceptual decision support tool used to evaluate nutrient reduction decisions for urban developments located on the Swan Coastal Plain in south-west Western Australia. The tool is designed for use by urban development proponents and for assessment by local and state government authorities. It provides a framework for implementing urban developments, selecting decision options to reduce nutrient exports, and generating reports for submission to decision-making authorities.

  3. Overview of the UNDO tool for nutrient management

    The UNDO tool is designed to assess and estimate nutrient export from urban developments on the Swan Coastal Plain in Western Australia. It allows land development proponents and government assessment officers to quantify the impact of developments and evaluate the effectiveness of various Best Management Practices (BMPs) to reduce nutrient runoff into estuaries, wetlands, and lakes. The tool can be used during the planning stage of a new development to meet nutrient export targets or applied to existing developments to quantify the impact of retrofitting management practices.

  4. Overview of the UNDO tool's purpose and capabilities

    The UNDO tool is designed for land development proponents and government authorities to evaluate and manage the nutrient impacts of urban developments. Its primary capabilities include:

    • Consistent evaluation of nutrient impacts based on local, national, and international literature.
    • User-friendly data entry for proponents to assess nutrient impacts.
    • Decision support for selecting management practices to reduce nutrient exports and meet development targets.
    • Generation of clear, concise reports summarizing development design and proposed nutrient management practices.
    • Streamlined approval processes for state and local governments through consistent assessment.

  5. Core design requirements of the UNDO tool

    The UNDO tool is built upon four fundamental requirements to ensure reliability and usability:

    1. Scientific Rigour: Uses export algorithms and BMP (Best Management Practice) efficacy based on Western Australian nutrient export processes and the best available local science.
    2. Ease of Access and Use: A web-based, intuitive interface requiring minimal training, with integrated help and documentation.
    3. Ease of Review and Assessment: Includes automatic reporting and project saving capabilities to allow decision-making authorities to easily verify BMPs and nutrient export targets.
    4. Reversion and Update Capability: Designed for easy implementation of updates as new scientific data on urban nutrient flux and BMP efficacy becomes available, supported by a formal version control process.

  6. Understand and define subregions in the UNDO tool

    Subregions are the fundamental building blocks of an UNDO tool project. They represent collective portions of land within a total development area; the sum of all subregions must equal the total development area. A subregion can consist of a single land category or a mixture of multiple land categories (such as public open space, road reserve, and urban residential). There are no restrictions on the number or size of subregions that can be added to a project. Subregions are configured during the pre-modelling phase of the project.

  8. Navigate the UNDO tool interface

    The UNDO tool uses a Command Bar located in the left panel for navigation between its four primary modules. Additionally, the interface provides a unit toggle button to switch reporting between absolute terms (kg/yr) and relative terms (kg/ha/yr), and a 'Switch Theme' button to toggle between Light and Dark themes (which persists across sessions).

  9. Define and manage subregions in the UNDO tool

    Subregions are the basic building blocks of an UNDO project. The sum of all subregions equals the total development area. A subregion can represent a single land category (e.g., urban residential) or a mixture of categories (e.g., public open space and road reserve). While there is no hard limit on the number of subregions, it is recommended to use a maximum of approximately 12 to keep the project manageable and maintain fast computation and reporting speeds.

  10. Configure nutrient export for a subregion in the UNDO tool

    The Export page calculates the quantity of nutrients exported from a land parcel at an 'edge-of-lot' scale before they enter a drainage system or treatment devices. To configure a subregion, users must complete the export configuration panel, which includes specifying the drainage type, soil type, presence of imported fill, depth to groundwater, groundwater gradient, and onsite sewage disposal systems.

  11. Apply and assess nutrient design using the UNDO tool

    After pre-modelling, use the UNDO tool to evaluate the nutrient design by entering data into the Input, Export, and Treatment modules. The tool provides the final export load of nitrogen and phosphorus.

    Assessment Workflow:

    • If targets are met: The design is satisfactory. Generate a report and submit it to decision-making authorities with required data.
    • If targets are not met: Alter the development design. You can edit the Input, Export, or Treatment modules, or reconfigure the subregions (which requires repeating the pre-modelling process). Repeat until targets are achieved.

  12. Submit data updates for the UNDO tool

    Users, proponents, universities, private consultants, industry bodies, or government entities can submit new or updated information to the UNDO tool team from the Department of Water. Submissions may include updated input rates for land-uses, new structural treatments, updated treatment curves, new soil types/parameters, advanced onsite sewerage disposal systems, updated nutrient uptake parameters, or updated process algorithms for water/nutrient movement.

    To be considered, submissions must include a published report or peer-reviewed journal paper with links to raw data. Marketing materials (e.g., brochures) are not sufficient for assessment.