How to Calculate Stream or drainage Length and Density in ArcGIS

You will learn how to calculate drainage or stream length and density using ArcGIS.
Delineating Watershed: https://www.youtube.com/watch?v=JAQVT4z8ZEw&t=6s
Download DEM Data: https://www.youtube.com/watch?v=DSSQ0HrT9bg

Why is stream density important?
Stream density, also known as drainage density, varies from watershed to watershed depending on infiltration capacity, or the ability of the soil to absorb water. When infiltration is low, water will flow overland and form streams. Certain kinds of geology (like sand, gravel, or limestone) have high infiltration, while others (like shale or clay) have low infiltration. Watersheds with high stream density have higher runoff and land that is more susceptible to erosion. Topography and slope also influence infiltration, with greater stream density occurring in areas with steep slopes. High rainfall tends to increase stream density, but in areas with the highest rainfall, stream density may be reduced; dense vegetation in these rain-prone areas reduces overland flow and increases evapotranspiration (the transfer of water from the earth to the atmosphere through evaporation and transpiration of plant leaves). Stream density is an important watershed characteristic that can be an indicator of potential water supply (Source: Enviro Atlas, USA).

How can I use this information?
The map, Stream Density, can be used to compare opportunities for recreation and water supply in different watersheds. Watersheds with high stream density provide more opportunities for birding, boating, fishing, swimming, and hunting. High stream density is also indicative of the potential for plentiful water supply (Source: Enviro Atlas, USA)..

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