I opened a google group, a mailing list to communicate among hydrologists. This will act 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.
The list is:
and below you can find instructions for subscribing to it (and eventually unsubscribe)
There you should see this window:
Click on the blue button "Apply to Join the group" to send an application.
I though it was more useful to have such a list than maintaining, each of us, a list of colleagues to send this kind of messages. I started the list and manage it, but I am looking for volunteers to manage it with me, and maybe without me, in the long run.