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Sameura Dam Monitor

Storage rates and related data for 125 dams in Japan including Sameura Dam
New in version 1.0.0-beta.5
Improved daily history retrieval, manual refresh timing, and storage rate display.
Improved parsing of 24:00 historical data headers.
Added an F-Droid link and simplified the About version display.
Included Sameura Dam historical data for September 2026.
Consolidated repository links on GitHub.
TCSameuraDamMonitor fetches dam data published by the Ministry of Land, Infrastructure, Transport and Tourism (MLIT) Hydrological and Water Quality Database and displays storage rates and related data for 125 dams in Japan, including Sameura Dam.

Features:
* Real-time data — fetches and stores real-time data, showing storage rate, storage volume, inflow, discharge and basin-average rainfall
* Storage rate messages — displays status and messages based on the storage rate, customizable
* Historical data — fetches and stores past data for any period, with offline search (Sameura Dam only)
* Interactive graphs — graphs for real-time and historical data (rainfall/storage rate, storage volume/inflow/discharge)
* Home screen widget — check the real-time storage rate and message at a glance
* Auto update and notifications — background real-time data fetching and storage change notifications

Data sources: The app fetches official dam data published by the Ministry of Land, Infrastructure, Transport and Tourism (MLIT) of Japan. Real-time data is fetched by default via sudmonitor (https://sudmonitor.kusugami-lab.net), a self-hosted, non-official caching relay of the same MLIT data; the official MLIT sources can be selected instead in the app settings. Daily historical data is provided through the sudmonitor relay only. This app contains no ads, trackers or analytics.

Anti-Feature (NonFreeNet): the default connection to the self-hosted sudmonitor relay is classified as a non-free network service.
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Versions

Although APK downloads are available below to give you the choice, you should be aware that by installing that way you will not receive update notifications and it's a less secure way to download. We recommend that you install the F-Droid client and use that.

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  • Version 1.0.0-beta.5 (6) suggested Added on Oct 18, 2026

    arm64-v8a armeabi-v7a x86 x86_64

    This version requires Android 14 or newer.

    It is built and signed by F-Droid, and guaranteed to correspond to this source tarball.

    Permissions
    • view network connections
      Allows the app to view information about network connections such as which networks exist and are connected.
    • run foreground service
      Allows the app to make use of foreground services.
    • have full network access
      Allows the app to create network sockets and use custom network protocols. The browser and other applications provide means to send data to the internet, so this permission is not required to send data to the internet.
    • show notifications
      Allows the app to show notifications
    • run at startup
      Allows the app to have itself started as soon as the system has finished booting. This can make it take longer to start the phone and allow the app to slow down the overall phone by always running.
    • prevent phone from sleeping
      Allows the app to prevent the phone from going to sleep.
    • net.tecogonaz.tcsameuradammonitor.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 9 MiB PGP Signature | Build Log

    • New in version 1.0.0-beta.4
    Keep notification setting off by default and request permission only when enabling auto-update or alerts.
  • Version 1.0.0-beta.4 (5) - Added on Oct 14, 2026

    arm64-v8a armeabi-v7a x86 x86_64

    This version requires Android 14 or newer.

    It is built and signed by F-Droid, and guaranteed to correspond to this source tarball.

    Permissions
    • view network connections
      Allows the app to view information about network connections such as which networks exist and are connected.
    • run foreground service
      Allows the app to make use of foreground services.
    • have full network access
      Allows the app to create network sockets and use custom network protocols. The browser and other applications provide means to send data to the internet, so this permission is not required to send data to the internet.
    • show notifications
      Allows the app to show notifications
    • run at startup
      Allows the app to have itself started as soon as the system has finished booting. This can make it take longer to start the phone and allow the app to slow down the overall phone by always running.
    • prevent phone from sleeping
      Allows the app to prevent the phone from going to sleep.
    • net.tecogonaz.tcsameuradammonitor.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 9 MiB PGP Signature | Build Log

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