C.P. Kumar of the National Institute of Hydrology, Roorkee provides a list of web communities on hydrology:
1. Hydrology Forum (Topica)
3. Hydrological Modelling
4. Ground Water Modelling
5. Groundwater Research and Management
6. Roorkee Hydrology Group
7. Decision Support Systems in Hydrology
9. Visual MODFLOW Users Group
10. Groundwater Vistas Users Group
14. Groundwater Assessment and Modelling
18. Modelling of Coastal Aquifers
C. P. KUMAR Scientist 'E1' National Institute of Hydrology Jal Vigyan Bhawan Roorkee - 247667 (Uttarakhand) INDIA
Web Page : http://www.angelfire.com/nh/cpkumar/