I have marked several points on a stream (distant 500m) and then calculated each point elevation using a DEM data. On a stream there are two gauge station to measure the flow rate (discharge value). I don't know how I will calculate discharge value of each point on a stream relative to the existing gauge station. I am using QGIS 2.18.x.

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    "Relative discharge" is a bit more complicated than you might expect. What is easy as a first setp is to compare the catchment areas of your points. Look for the GRASS commands r.watershed and r.water.outlet – Marco May 2 at 19:38

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