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Add DAM to DEM 11 years 10 months ago #33

  • Marc
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How do I create a new DAM in RAMMS?

This tutorial describes how to create a new DAM in RAMMS.

IMPORTANT: This is only a very simple routine....if you want to create an accurate DAM, please use ArcGIS instead (or any other program) and export a new ASCII grid file and then create a new project in RAMMS.

Steps to build a DAM in RAMMS:
  1. Open a project INPUT file where you want to build a new DAM.
  2. Use the 'Draw new release area' function to draw a dam-polygon. Name it appropriately (e.g. dam_outer, see below).
  3. Draw a second, inner dam-polygon if you wish (it's possible to have an inner and outer polygon, and to specify different heights for each polygon area, see inner polygon below.
  4. It is possible to add a relative or a absolute dam height to the DEM.
  5. Choose 'GIS/GRASS -> Add DAM to DEM... -> Enter Relative Dam Height'
  6. Specify the first (outer) dam file, see below:
  7. Answer the question if you have an second (inner) polygon file with 'Yes' or 'No', see below:
  8. Click 'Yes' and specify the second (inner) polygon file, otherwise skip the next point.
  9. Enter the total relativ dam height, e.g. 30m, see below:
  10. Enter intermediate dam height for the area of (outer-inner), e.g. 10m. See the resultant dam later to know the meaning of the intermediate height.
  11. Enter name of new DEM, see below:
  12. The new DEM file will be created. Now create a new project with the newly created DEM file, see result below
  13. If you choose 'GIS/GRASS -> Add DAM to DEM... -> Enter Dam Elevation', choose one dam polygon file (e.g. the inner polygon) and enter a final dam elevation of e.g. 1360m, then the result looks like this:
Last Edit: 11 years 10 months ago by Marc.
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