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The frame shows the current fill, the last 12 months, and the same period a year earlier. It updates when the daily data deploy updates the site. No ads. The line “Data: reservoirs.earth” stays in the frame and links to the page for this figure. That credit is required. CC BY 4.0 covers only reservoirs.earth's derived data. The official source data follows each source's licence. This example is Alcántara, a reservoir on the Tagus in Spain. A reservoir, basin, or country page opens this builder with that chart instead.

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Include the auto-resize script. Recommended for Responsive.

Snippet

<iframe src="https://reservoirs.earth/embed/reservoir/spain/alcantara?theme=light" title="Alcántara" width="480" height="250" style="border:0;width:100%;max-width:480px" loading="lazy" referrerpolicy="strict-origin-when-cross-origin"></iframe>
<script async src="https://reservoirs.earth/embed/resize.js"></script>

The iframe loads from reservoirs.earth. Include the resize script with Responsive. The height covers a column from 200 to 1200 pixels wide, and the script fits the frame when the column changes. Without the script, set the iframe height yourself.