Hydrological GIS data are widely used by public organizations, environment, water supply and water treatment companies. Water data analysis can be very specific, and is not a GIS-only field.
It is therefore interesting to look at FOSS4G applications, to see how they fit the need to have a real FOSS4G stack for water-related data handling and analysis.
BYU ScholarsArchive Citation
"QGIS/PostGIS : stacking FOSS4G for water management,"
Open Water Journal: Vol. 2
, Article 14.
Available at: http://scholarsarchive.byu.edu/openwater/vol2/iss1/14