We are going to continue using data from the provided ZIP file, and we will need the following files:
- Elevation file (
dems_10m.dem, available in the GRASS data folder) - Gauge shapefile (
gauge.shp) - Rivers file (
hydl.shp)
To explore the hydrologic functionality of SAGA, we will characterize the watershed of Sun Creek upstream to the town of Fort Klamath, California. To accomplish this, we will perform the following tasks:
- Remove pits from the DEM
- Calculate flow directions across the landscape
- Calculate the upstream area above Fort Klamath
- Calculate a stream network raster grid
- Create a watershed-specific vector stream network
Before using any hydrologic algorithms, regardless of the algorithm provider, we need to make sure that the DEM is hydrologically corrected. This means that we need to ensure that it behaves like the natural landscape, where surface flow moves across the land and does not get trapped in pits or depressions, in the...