[[Image:waterstorage.jpg|thumb|right|300px|Underground water storage tank from harvested rainwater at one of the farms participating in CARE's permaculture initiative. Farm in Bayoudeh. Photo: [http://wwwpermaculturenews.kitchencaravan.comorg/2009/01/season1114/episode6greenhouse-0 Kitchen Caravaneffect Link].]]
Improving the availability of water over time is one of the technical measures to increase the [[Resilient WASH systems in drought-prone areas|resilience of WASH systems]], as more water is available to span increasing length of dry seasons, or, relevant to agriculture, short dry spells. Different options are: