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What does SAGA's flow connectivity show?

The 'flow connectivity' output shows how fragmented are your channels. In the picture below the channels colored in blue/purple are the less fragmented (runoffs and sediments can flow 'freely') ...
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How to resolve the problem of multiple parallel streams and unmatched river flow in Stream Network?

These well known artefacts caused by either low resolution of DEM (large flat areas) or depressions. In case of flat terrain, you can try Taudem package, it might improve results somehow. If issue ...
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