By choosing 'Rainwater', all rain- and fogwater harvesting technologies are offered in the Knowledge Base. These include

Rainwater technologies reduce load on ground- and surface water sources, are ecologically sustainable and provide proper water quality. A basic requirement to most of these technologies is the availability of at least 200 mm rainfall per annum in the implementation area.

WHO Monograph Series, Wagner and Lanoix (p34-35) on water source prioritisation: WATER SUPPLY FOR RURAL AREAS AND SMALL COMMUNITIES