4.1             Fill Pits

 

Fill Pits fills pits in a grid.  If a cell is surrounded by higher elevation cells, the water is trapped in that cell and cannot flow.  They are generally taken to be artifacts that interfere with the routing of flow across DEMs, so are removed by raising their elevation to the point where they drain off the edge of the DEM. Original pit locations can be identified and “protected” from getting modified by this function. (TAUDEM, accessed 2006).

 

 

In the Input section of the dialog browse to the raw DEM file. It could be either an ESRI binary (*.adf) or Arc/Info ascii file (*.asc).  In the Output section browse a file name to which the pit-filled grid could be saved. At this point the module is ready for processing. Select Run to start processing. Depending on the size and resolution of DEM the processing could take several minutes. The text browser at the bottom of the dialog should provide information related to any error or processing. If the Load in Data Frame is checked the Pit-Filled Grid will be automatically loaded in the Qgis window. After the processing is complete you need to press Close to proceed to next step.