<div dir="auto">Tony and list,<br><br><div class="gmail_quote gmail_quote_container" dir="auto"><div dir="ltr" class="gmail_attr">On Thu, Apr 16, 2026, 14:49 Tony Shepherd via QGIS-User <<a href="mailto:qgis-user@lists.osgeo.org">qgis-user@lists.osgeo.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div lang="EN-NZ" link="#467886" vlink="#96607D" style="word-wrap:break-word"><div class="m_1999403331521097042WordSection1"><p class="MsoNormal">Hi All<u></u><u></u></p><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal">Just a question to see how others are achieving this. I often get asked to measure the area of a catchment, upstream of a particular point. With a DTM/DEM I would have thought that there should be a simple tool to do this - click a point, and then shade or draw me a polygon of everything upstream of that point. Sounds easy, but achieving this isn’t so simple, or maybe I am missing an easy-to-use tool or plug-in?<u></u><u></u></p><p class="MsoNormal"><u></u> </p></div></div></blockquote></div><div dir="auto"><br></div><div dir="auto">Have you reviewed this documentation on the topic?</div><div dir="auto"><br></div><div dir="auto"><a href="https://docs.qgis.org/3.44/en/docs/training_manual/processing/hydro.html">https://docs.qgis.org/3.44/en/docs/training_manual/processing/hydro.html</a></div><div class="gmail_quote gmail_quote_container" dir="auto"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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