Determine start/end points for line slope calculation

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This is a follow up question based off of this question.

I have a line feature class representing storm drains and a point feature class representing where storm drains are connected. The point feature class has an elevation for each point allowing me to determine the slope of the storm drain as the difference in elevation from start to end divided by the length of the storm drain. However, most of my points act as starting points for one storm drain and end points for another at the same time. I do know that the start point should always be the point with a higher elevation to facilitate water flow.

How can I calculate the slope for each line segment and designate which points are the start/end points for each line?

Would it be better to calculate new lines based off of my points layer that would include a slope field or is there a way to automate this calculation between the two layers?

I have an ArcMap Advanced license but no 3D or Spatial analyst extensions. I am open to Python and QGIS solutions. I just don;t want to have to enter these values in manually as I know there must be a way to automate it.





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