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<p>Hello Tony:<br>
</p>
<p>To add to Chris's comment. Depending on which version of QGIS
you are using, SAGA is not automatically implemented. In recent
versions, I believe there is a plugin which allows for SAGA
implementation. Check out Geosearch's tutorial at:</p>
<p><a class="moz-txt-link-freetext" href="https://www.youtube.com/watch?v=ceBOzPtQvms">https://www.youtube.com/watch?v=ceBOzPtQvms</a><br>
</p>
<p>Another work around is to install SAGA directly and use it to
complete the watershed analysis. SAGA is a powerful, fast raster
analysis tool and QGIS can read the resultant binary rasters
natively.</p>
<p>A nice tutorial by Random Topics in GIS is available at:</p>
<p><a class="moz-txt-link-freetext" href="https://www.youtube.com/watch?v=eC_CONLzP8s">https://www.youtube.com/watch?v=eC_CONLzP8s</a></p>
<p>Kirk Schmidt</p>
<p><br>
</p>
<p>On 4/17/2026 1:39 AM, chris hermansen via QGIS-User wrote:</p>
<blockquote type="cite"
cite="mid:CACc2_69gtaTktMThZFk3VNOXNmdNyPueA6H14ZMTmJjBjesZRA@mail.gmail.com">
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<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"
moz-do-not-send="true" class="moz-txt-link-freetext">qgis-user@lists.osgeo.org</a>>
wrote:<br>
</div>
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<p class="MsoNormal">Hi All</p>
<p class="MsoNormal"> </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?</p>
<p class="MsoNormal"> </p>
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</blockquote>
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<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"
moz-do-not-send="true" class="moz-txt-link-freetext">https://docs.qgis.org/3.44/en/docs/training_manual/processing/hydro.html</a></div>
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<br>
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<pre class="moz-signature" cols="72">--
Kirk Schmidt, MScF, BScF, RPF
General Manager
Nortek Resource Solutions Inc.
26 Church Road
Sutherlands River, NS
B0K 1W0
Tel (902) 922.3607
Email: <a class="moz-txt-link-abbreviated" href="mailto:kirk@nortekresources.com">kirk@nortekresources.com</a>
Web: <a class="moz-txt-link-abbreviated" href="http://www.nortekresources.com">www.nortekresources.com</a></pre>
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