The types of geosynthetics used in foundation drainage are:
1. Geotextiles: non-woven or woven fabrics used to filter water while allowing it to pass through
2. Geonets: plastic grids used to create drainage channels for water to flow through
3. Geocomposites: combinations of geotextiles and geonets used for filtration and drainage purposes
4. Geopipes: perforated plastic pipes used to collect and channel water away from the foundation
5. Geosynthetic clay liners: a combination of bentonite clay and geotextiles used to create a barrier to water flow.
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