From Western Australia Government
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Drainage Headwalls

Created 23/06/2025

Updated 14/09/2025

JSON format icon JSON RDF format icon RDF ISO19115-3 XML

This layer shows location of drainage headwalls within the Metropolitan Region and is provided for information only. A Headwall is defined as a retaining wall placed at the inlet or outlet of a stormwater pipe or culvert. It can be owned by Main Roads WA or others.Data dictionary:FieldAliasTypeDescriptionHeadwall_No Headwall NoString“Road_No” & ”.“ & Unique Database Number e.g. H015.569Asset_OwnerAsset OwnerStringOwner of the asset e.g. Main RoadsRoad_No Road NoStringMRWA Road NumberData_StatusData StatusStringField survey verification e.g. Verified / Asset Captured via Desktop onlyMapping_CommentsMapping CommentsStringAny additional comments that relate to this pipe section including assumptionsConfidence_RatingConfidence RatingStringA confidence level assigned based on the source data used to digitise the featureDisclaimer:1. Please note that Main Roads WA drainage data is provided for information only and the data may be inaccurate, incomplete or out-of-date.  Please use as a reference only and verification is to be undertaken on site.2. Confidence Rating has been assigned to individual assets to provide an indication of the accuracy of the data.  However please note that this is only an estimated rating which should be used as a reference only.3. Asset Owner – Please note that Main Roads WA drainage data includes multiple organisations’ interface drainage and, as a result, the ‘Asset Owner’ attribute is only to be used as a reference only as it may be inaccurate and should not be referred to as the source of truth.4. Asset Types:a. Interfacing Structuresi. Note that the drainage data includes interface points between Main Roads WA drainage structures and structures owned by other asset owners.  However not all assets owned by other asset owners have been included.  Please seek clarification from the respective asset owners if required.b. Ghost Structure / Nodei. Ghost Node Structure represents a physical structure where the asset type is not known and Ghost Node represents a node only that is not owned by Main Roads WA.  Any assets owned by other organisations beyond a direct connection can be represented by the use of a Ghost Link. Note that you are accessing this data pursuant to a Creative Commons (Attribution) Licence which has a disclaimer of warranties and limitation of liability. You accept that the data provided pursuant to the Licence is subject to changes.Pursuant to section 3 of the Licence you are provided with the following notice to be included when you Share the Licenced Material: "The Commissioner of Main Roads is the creator and owner of the data and Licenced Material, which is accessed pursuant to a Creative Commons (Attribution) Licence, which has a disclaimer of warranties and limitation of liability."Creative Commons CC BY 4.0 https://creativecommons.org/licenses/by/4.0/

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Additional Info

Field Value
Title Drainage Headwalls
Language English
Licence Creative Commons Attribution 3.0 Australia
Landing Page https://data.gov.au/data/en/dataset/97db7a3d-310c-4247-8cd0-97e66218fc8c
Remote Last Updated 16/08/2025
Contact Point
Main Roads Western Australia
gis@mainroads.wa.gov.au
Reference Period 04/02/2025
Geospatial Coverage
Map data © OpenStreetMap contributors
{
  "coordinates": [
    [
      [
        115.6401,
        -32.5737
      ],
      [
        116.3494,
        -32.5737
      ],
      [
        116.3494,
        -31.4883
      ],
      [
        115.6401,
        -31.4883
      ],
      [
        115.6401,
        -32.5737
      ]
    ]
  ],
  "type": "Polygon"
}
Data Portal Western Australia Government

Data Source

This dataset was originally found on Western Australia Government "Drainage Headwalls". Please visit the source to access the original metadata of the dataset:
https://catalogue.data.wa.gov.au/dataset/mrwa-drainage-headwalls