diff --git a/free-programming-books.md b/free-programming-books.md
index 8b78ffcb43953cc32b99f1222b069682f37c1d16..2e21a36a13d1a14ff1f3c9671b3be60e0c31e248 100755
--- a/free-programming-books.md
+++ b/free-programming-books.md
@@ -1099,6 +1099,7 @@ See also [TeX](#tex)
 * [Building Skills in Object-Oriented Design (Python)](http://www.itmaybeahack.com/book/oodesign-python-2.1/latex/BuildingSkillsinOODesign.pdf)
 * [Text Processing in Python](http://gnosis.cx/TPiP/) - David Mertz
 * [Welcome to Problem Solving with Algorithms and Data Structures](http://interactivepython.org/runestone/static/pythonds/index.html) - Brad Miller and David Ranum
+* [Python in Hydrology](http://www.greenteapress.com/pythonhydro/pythonhydro.html) - Sat Kumar Tomer
 
 
 ####Django