Do you have a free software program or textbook of interest to the hydrologic community?
Wish you could just send one email and have it reach hundreds of your colleagues?
Welcome to the About Hydrology mailing list! This acts the very same way the Gilbert Club list does for geomorphologists in being used to send announces about events, Ph.D. and post-doc positions, new books, open source software, AGU and EGU sessions and so on. All about hydrology, obviously.
The list has so far (Februay 2018) more than 2900 active subscribers, and therefore sending around information through it is pretty effective, and save you the weight to maintain your own list of email addresses. Besides any message is also sent to the [hydrosci-l] mailing list that counts another 200 or so subscribers.
To subscribe go to the page: https://groups.google.com/forum/#!forum/abouthydrology or Search “AboutHydrology Google Group”. Maintaners of the group are me, Stacey Archfield, and Giuseppe Formetta.