A range of wiki resources exist on water.
Appropedia
Appropedia covers a wide range of water and sanitation topics, with projects, guides and topical information. See the category tree (click the + to expand):
The Sanitation category covers both water-based systems of sanitation and non-water based systems (notably composting toilets). Category tree (click the + to expand):
Other wikis
- Akvopedia - focused on details of specific low cost technologies.
- WaterWiki - by the UNDP
- Wikipedia:Portal:Water