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Is there anyway to alter elevation of DEM where there are bridges and dams for the flood routing of the River?

I have to calculate discharge of the River from ancient times so at that time there were no dams and bridges.

  • I'm not sure how to go about altering the DEM itself, but I have a couple of ideas/clarification questions for you: First, do you have the locations of the bridges and dams in other vector layer(s)? If so you could look for drastic changes in slope near each of the bridge/dam markers to know which cells to change. Second, rivers are constantly changing entities. Their course in ancient times may be vary different from what it is currently. Similarly climate patterns and rainfall may be very different which would also impact discharge. – ycartwhelen Jun 10 at 16:13
  • Thanks alot for the reply. Yes I have the location of Bridges and Dams but I dont know how to edit its elevation. – Muntaha Urooj Jun 12 at 16:14
  • Actually the purpose of the study is the Dam Breaching of River in ancient times for that I dont have to incorporate rainfall and climate change.. – Muntaha Urooj Jun 12 at 16:16

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