Since the publication of my book entitled "Fundamentals of Open-channel Hydraulics" in 2014, I have often been asked what is the difference between our book and Chow's "Open-channel Hydraulics," an undisputed classic in the field, dating back to 1959.

There are nine differences:

1. Our book is up-to-date.

2. Our book is completely free.

3. Our book is available online.

4. Our book is lavishly illustrated and in full color.

5. Our book is browsable between and within chapters..

6. Our book makes extensive use of online calculations.

7. Our book features hot links to important literature references. .

8. Our book is alive, subject to change as typos and other errors are identified and corrected, yet remaining amenable to improvements as new developments arise.

9. Our book may be automatically translated into more than one-hundred languages, simply by cutting and pasting portions of its content. Note that the translation may not be 100% accurate.