Hydrology in ArcGIS Pro, Lab Exercise 2: Problems when creating Watersheds without filling the DEM!

The point of this lab is partially to refresh your memory on how to create a file geodatabase and turn on the Spatial Analyst extension, and mostly to learn the consequences of failing to fill a DEM before running hydrologic analyses on it. This exercise will fail to correctly generate a watershed. Most people forget to fill the DEM before creating the watershed, so most people encounter this problem and therefore I want you to recognize and understand the problem when it happens to you. The next few labs will show you how to do it correctly.

Basic Hydrologic Analysis in ArcGIS Pro Lecture:    • Basic Hydrologic Analysis in ArcGIS Pro  

Lab Exercises:
Lab 1: Calculating Areas from Raster Datasets;    • Hydrology in ArcGIS Pro, Lab Exercise...  
Lab 2: Problems when creating Watersheds without filling the DEM;    • Hydrology in ArcGIS Pro, Lab Exercise...  
Lab 3: Filling Sinks in a DEM;    • Hydrology in ArcGIS Pro, Lab Exercise...  
Lab 4: Calculating an Accurate Flow Direction Raster;    • Hydrology in ArcGIS Pro, Lab Exercise...  
Lab 5: Generating an Accurate Watershed;    • Hydrology in ArcGIS Pro, Lab Exercise...  
Lab 6: Creating a Flow Accumulation Raster;    • Hydrology in ArcGIS Pro, Lab Exercise...  
Lab 7: Generating a Stream Network using Strahler Stream Orders;    • Hydrology in ArcGIS Pro, Lab Exercise...  
Lab 8: Aspect Statistics within Watershed;    • Hydrology in ArcGIS Pro, Lab Exercise...  
Lab 9: Slope Statistics within Watershed;    • Hydrology in ArcGIS Pro, Lab Exercise...  
Lab 10: The Topographic Wetness Index (TWI);    • Hydrology in ArcGIS Pro, Lab Exercise...  
Lab 11: Finding the Shortest Path Through the Stream Network;    • Hydrology in ArcGIS Pro, Lab Exercise...  

Extra Materials:
Word Document with walk-throughs of lab exercises: https://docs.google.com/document/d/13...

Data for Lab Exercises: https://drive.google.com/file/d/1i07m...

Manuscripts discussing TWI: https://drive.google.com/file/d/1W4Ty...