--- title: Daily storage volume of Melbourne Water's dams, 1940 to 2020 resource: https://publicdata.au/d/vic-melbourne-water-daily-storage/ publisher: Melbourne Water Corporation licence: CC BY 4.0 licence_url: https://creativecommons.org/licenses/by/4.0/ version: 2026-06-26 rows: 218426 fields: 5 source: https://data-melbournewater.opendata.arcgis.com/api/download/v1/items/7db00ccb52134f53991257edfe37cade/csv?layers=0 source_sha256: 320ae3a8bb0194f365ebdc5de041474ef0ba45aaf2775210eaf7a7fd984c74e6 language: en-AU operator: National Digital not_endorsed: true --- # Daily storage volume of Melbourne Water's dams, 1940 to 2020 The volume of water in each of Melbourne Water's ten storage dams on every day from 1940 to February 2020, in megalitres and as a percentage of capacity. Published by Melbourne Water Corporation under CC BY 4.0 and republished here in other formats, with cells typed and suppressed values made null. Melbourne Water Corporation has not endorsed this site. Also called: Melbourne Water daily storage volumes, Melbourne dam levels daily, Thomson Dam storage history, Water supply daily volume observed for storage dams. ## Download Latest version, redirects to `https://publicdata.au/d/vic-melbourne-water-daily-storage/v/2026-06-26/`: - csv: https://publicdata.au/d/vic-melbourne-water-daily-storage/latest/data.csv (11 MB) - xlsx: https://publicdata.au/d/vic-melbourne-water-daily-storage/latest/data.xlsx (6.4 MB) - json: https://publicdata.au/d/vic-melbourne-water-daily-storage/latest/data.json (27 MB) - parquet: https://publicdata.au/d/vic-melbourne-water-daily-storage/latest/data.parquet (2.1 MB) - sqlite: https://publicdata.au/d/vic-melbourne-water-daily-storage/latest/data.sqlite (14 MB) - duckdb: https://publicdata.au/d/vic-melbourne-water-daily-storage/latest/data.duckdb (7.0 MB) - ndjson: https://publicdata.au/d/vic-melbourne-water-daily-storage/latest/data.ndjson (27 MB) - arrow: https://publicdata.au/d/vic-melbourne-water-daily-storage/latest/data.arrow (2.4 MB) - csv.gz: https://publicdata.au/d/vic-melbourne-water-daily-storage/latest/data.csv.gz (2.2 MB) Pinned version 2026-06-26: `https://publicdata.au/d/vic-melbourne-water-daily-storage/v/2026-06-26/data.`. Dated versions never change. ## Query The query API returns only the rows you ask for, as JSON, NDJSON or CSV, from the same typed rows as the files. It needs no key. Rows: https://publicdata.au/api/v1/datasets/vic-melbourne-water-daily-storage/rows. Counts and sums: https://publicdata.au/api/v1/datasets/vic-melbourne-water-daily-storage/aggregate. - Rows: https://publicdata.au/api/v1/datasets/vic-melbourne-water-daily-storage/rows?record_date=eq.2020-02-28T13%3A00%3A00&limit=5 - Aggregate: https://publicdata.au/api/v1/datasets/vic-melbourne-water-daily-storage/aggregate?group=dam&metric=avg.volume_percent_full&record_date=eq.2020-02-28T13%3A00%3A00 Each filter is `field=operator.value` in the query string, and every filter must match. A number or date field compares as a number or date, and a text field compares as text. Values are case-sensitive except with `ilike`. Prefix `not.` to negate a filter, as `not.eq.value`. Operators: `eq.value`, `neq.value`, `gt.value`, `gte.value`, `lt.value`, `lte.value`, `like.*text*`, `ilike.*text*`, `in.(a,b,c)`, `is.null`. - `select`: Fields to return, comma-separated. Every field when absent. - `order`: `field.asc` or `field.desc`, comma-separated. The publisher's row order when absent. - `limit`: Rows per page, 1 to 10,000. 100 when absent. - `offset`: Rows to skip. The `next` URL in each answer sets it for you. - `group`: On `aggregate`, fields to group by, comma-separated. - `metric`: On `aggregate`, `count`, `sum.field`, `avg.field`, `min.field` or `max.field`, comma-separated. `count` when absent. - `format`: `json`, `ndjson` or `csv`. JSON carries the provenance header, and the others carry it in response headers. Without a version the API answers from the newest loaded version, and that answer changes when the publisher releases again. Put `versions//` before `rows` or `aggregate` for an answer that never changes. `/api/v1/datasets//versions` lists the loaded versions. The API allows 60 requests in 10 seconds from one address. Above that it answers 429 for 10 seconds with a `Retry-After` header, a `RateLimit-Policy` header and a JSON body that gives the limit. Every API answer carries the same `RateLimit-Policy`. A client should wait the `Retry-After` seconds, or read the files, which have no limit. OpenAPI for this dataset: https://publicdata.au/d/vic-melbourne-water-daily-storage/openapi.json ## Explore Charts and dashboards in the browser: https://publicdata.au/d/vic-melbourne-water-daily-storage/explore/. A dashboard can be shared as a link or embedded. ## Smaller files - by `dam`: https://publicdata.au/d/vic-melbourne-water-daily-storage/v/2026-06-26/by/dam/index.json lists 10 files ## Fields | field | type | publisher's header | note | |---|---|---|---| | `record_date` | datetime | recorddate | The day of the reading as the publisher's service stores it, local midnight in UTC. | | `dam` | string | dam | | | `volume_ml` | number | volume_ML | The volume held, in megalitres. Null where no reading was recorded. | | `volume_percent_full` | number | volume_percentfull | The volume as a percentage of the dam's capacity, as published. | | `object_id` | integer | ObjectId | The row's id in the publisher's service. | Key: `object_id`. ## Versions - 2026-06-26: 218426 rows, 5 fields, sha256 320ae3a8bb01. https://publicdata.au/d/vic-melbourne-water-daily-storage/v/2026-06-26/ Machine-readable: https://publicdata.au/d/vic-melbourne-water-daily-storage/versions.json, https://publicdata.au/d/vic-melbourne-water-daily-storage/changes.json, https://publicdata.au/d/vic-melbourne-water-daily-storage/datapackage.json, https://publicdata.au/d/vic-melbourne-water-daily-storage/schema.json, https://publicdata.au/d/vic-melbourne-water-daily-storage/history.tar.zst ## Same subject, other publishers - [Daily water storage levels, Australian dams and reservoirs](https://publicdata.au/d/au-water-storage-levels/) (Cth) - [Monthly water storage levels, Victoria](https://publicdata.au/d/vic-water-storage-levels/) (Vic) - [Reservoir volumes, metropolitan Adelaide](https://publicdata.au/d/sa-reservoir-volumes/) (SA) - [Water storages and their capacity, Victoria](https://publicdata.au/d/vic-water-storages/) (Vic) - [Water storages reporting to the Bureau of Meteorology, Australia](https://publicdata.au/d/au-water-storages/) (Cth) - [Beach Report enterococci samples, Port Phillip Bay, since 2013](https://publicdata.au/d/vic-beach-report-enterococci/) (Vic) - [Bushfire and prescribed burn history, South Australia](https://publicdata.au/d/sa-fire-history/) (SA) - [Air quality monitoring by hour, ACT](https://publicdata.au/d/act-air-quality/) (ACT) - [Lakes and rivers water quality samples, ACT](https://publicdata.au/d/act-lakes-rivers-water-quality/) (ACT) - [Recreational lakes and rivers water quality, ACT, 2019-20 season](https://publicdata.au/d/act-recreational-water-quality-2019-20/) (ACT) - [Recreational lakes and rivers water quality, ACT, 2018-19 season](https://publicdata.au/d/act-recreational-water-quality-2018-19/) (ACT) - [Beachwatch swim sites with pollution forecasts and latest water quality, New South Wales](https://publicdata.au/d/nsw-beachwatch-sites/) (NSW) ## Attribution and citation Melbourne Water Corporation, Water Supply, daily volume observed for storage dams operated by Melbourne Water, sourced 3 October 2026, https://discover.data.vic.gov.au/dataset/water-supply-daily-volume-observed-for-storage-dams-operated-by-melbourne-water, licensed under CC BY 4.0. The licence requires the publisher's attribution. We ask that you also name publicdata.au and link to the version you used. Plain text: Melbourne Water Corporation, Water Supply, daily volume observed for storage dams operated by Melbourne Water, sourced 3 October 2026, https://discover.data.vic.gov.au/dataset/water-supply-daily-volume-observed-for-storage-dams-operated-by-melbourne-water, licensed under CC BY 4.0. Serialised and versioned by National Digital at publicdata.au, https://publicdata.au/d/vic-melbourne-water-daily-storage/v/2026-06-26/ Harvard: Melbourne Water Corporation (2026) Daily storage volume of Melbourne Water's dams, 1940 to 2020, version 2026-06-26 [data set], CC BY 4.0, sourced 3 October 2026. Serialised and versioned by National Digital at publicdata.au. Available at: https://publicdata.au/d/vic-melbourne-water-daily-storage/v/2026-06-26/ Markdown: Data: [Daily storage volume of Melbourne Water's dams, 1940 to 2020](https://discover.data.vic.gov.au/dataset/water-supply-daily-volume-observed-for-storage-dams-operated-by-melbourne-water), Melbourne Water Corporation, [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/), sourced 3 October 2026. Files: [publicdata.au](https://publicdata.au/d/vic-melbourne-water-daily-storage/v/2026-06-26/) by [National Digital](https://nationaldigital.com.au/). ## Questions ### How do I download Daily storage volume of Melbourne Water's dams as a CSV file? Open https://publicdata.au/d/vic-melbourne-water-daily-storage/latest/data.csv. It redirects to the newest dated version, which is https://publicdata.au/d/vic-melbourne-water-daily-storage/v/2026-06-26/data.csv today. The same path serves Excel, JSON, Parquet, SQLite, DuckDB, NDJSON, Arrow. A dated URL never changes, so use it when the file must stay the same. ### Can I open Daily storage volume of Melbourne Water's dams in Excel? Yes. https://publicdata.au/d/vic-melbourne-water-daily-storage/v/2026-06-26/data.xlsx is a workbook with the 218,426 rows on a records sheet, the field list on a second sheet and the provenance on a third. The CSV also opens in Excel. https://publicdata.au/d/vic-melbourne-water-daily-storage/v/2026-06-26/data.csv.gz is the CSV at about a tenth of the size. ### What years does Daily storage volume of Melbourne Water's dams cover? The current version covers 1940 to 2018. Each release from Melbourne Water becomes a new dated version here, and earlier versions stay online. ### How often is Daily storage volume of Melbourne Water's dams updated? Melbourne Water no longer updates it. This site checks the portal every week and adds a dated version when the file changes. ### Can I use Daily storage volume of Melbourne Water's dams commercially? Yes. CC BY 4.0 allows commercial use, redistribution and derived works as long as the attribution is kept. The attribution string is in this page's side column and inside every file. ### Is this the official source for Daily storage volume of Melbourne Water's dams? No. The publisher is Melbourne Water Corporation, and its page is https://discover.data.vic.gov.au/dataset/water-supply-daily-volume-observed-for-storage-dams-operated-by-melbourne-water. This site republishes the publisher's file without changing its content. The original sits beside every version as source.csv with its SHA-256, so the two can be compared. ### How do I get only the rows for one dam? Every version has one JSON file per value of dam, 10 files in the current version, listed with row counts at https://publicdata.au/d/vic-melbourne-water-daily-storage/v/2026-06-26/by/dam/index.json. For example https://publicdata.au/d/vic-melbourne-water-daily-storage/v/2026-06-26/by/dam/maroondah.json holds the 29,280 rows where dam is Maroondah. ### What does each row hold? The volume held in one of Melbourne Water's ten storage dams on one day, in megalitres, and the share of the dam's capacity that volume is. Maroondah, O'Shannassy, Silvan and Yan Yean go back to 1 January 1940. The others start when they came into the record. ### Why is the time 1 pm or 2 pm? The publisher's service stores each reading as a moment in UTC, so local midnight appears as 1 pm or 2 pm on the previous day depending on daylight saving. The value is kept as published. The volume itself is recorded at 8 am each day. ### Why does it stop in February 2020? The portal's file of the complete record ends on 29 February 2020 and has not been extended. Some days have no volume, and those cells are null. ## What this site did to the data Cells were typed, headers were renamed to snake_case and the encoding was made UTF-8. Rows were left alone. Nothing is derived. The publisher's file is beside every version as `source.csv`. ## Improve this dataset This page is built from [register/vic-melbourne-water-daily-storage.yaml](https://github.com/National-Digital/publicdata.au/blob/main/register/vic-melbourne-water-daily-storage.yaml) on GitHub, and a fix to it is welcome as a pull request. https://publicdata.au/contribute/ explains how.