Using QGIS to conduct watershed analysis and 3D modeling

Introduction and purpose

The purpose behind this tutorial is to show how QGIS can be used to conduct watershed analysis and how to create a 3D model of the Catchment area of the watershed using DEMs (Digital Elevation Model). This tutorial is meant to educate the user on how to conduct the analysis while introducing the theory behind it in a very simple manner in order for the user to understand the theory and apply the tutorial at the same time.

Acquiring DEMs

There are many websites that allow users to acquire DEMs, as a Carleton student, your best website you can use is the Geospatial Data Library of Carleton University linked HERE. Carleton University grants its student access to all sorts of geospatial data through its library and third parties like Scholars GeoPortal. For the purpose of this tutorial, I have found a DEM of rivers in Malaysia and will provide you with a link to the DEM if you would like to follow along. The link to the DEM can be downloaded from HERE.