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Determining maximum capacity of river using HEC-RAS

To determine the maximum flow rate before overflow, we need to know the maximum water surface elevation beyond which the overflow will occur. Once we know the WSEL, we can use the Perform design ...
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Tool generating hill slope forms (divergent, convergent, uniform) in QGIS

I'm not exactly sure what you mean by "slope wider". But you might be able to use the Topographic Wetness Index. This is one of the outputs of the GRASS module r.watershed
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