The iBooks version (which is viewable on iBooks viewer) is available for download at the iBooks Store: iBooks Version (2017a Edition).
If you’d prefer a PDF version with embedded videos instead, you can you can download it directly (~360MB file!): PDF Version (2017a Edition).
The lecture slides that accompany the book may be useful to students and/or instructors: Zipped slides for each chapter.
The MOD-WET functions (and some test basin files) are provided in the following zipped file with functions grouped by chapter in the textbook: zipped MOD-WET codes.
Additionally, there is a “User Guide” for the MOD-WET model provided below: MOD-WET 2017a User Guide.
A presentation designed to provide a tutorial for the MOD-WET watershed model setup is given in the following video (in 3 parts): MOD-WET Tutorial (part 1 of 3), MOD-WET Tutorial (part 2 of 3), MOD-WET Tutorial (part 3 of 3).