I am doing Project on Drainage basin, to find out the Elongation ratio I need to find out Basin length, Can any one of you tell me how to find out BASIN LENGTH using ArcGIS or any other way. My data base is like below Image
(i just uploaded this image from internet)
Best Answer
If by Basin Length, you mean the maximum distance from the watershed boundary to the pour point, you need to use the Hydrology tools from the Spatial Analyst Toolbox.
First fill the sinks of your DEM using the Fill Tool.
Then calculate the Flow Direction, using the Flow Direction Tool
Finally Use the Flow Length Tool.
The value of the output at the pour point, is the maximum Flow Length.