==Suitable conditions ==
{{Climate_change
|heading1=Drought
|text1='''Effects of drought''': Badly made concrete and cracked linings (e.g. in tanks, dams, waterways, wells, and other structures). <br>'''Underlying causes of effects''': Less water used for curing; Impure water used for mixing. <br>'''To increase resiliency of WASH system''': Ensure adequate mixing, ratios, purity of ingredients; Minimize water content in mixture; Ensure adequate curing.
}}
* Rainwater harvesting requires at least an annual rainfall of 100-200 mm. Depending on the size of the design; the tank has a capacity of 1,500 to 10,000 liter.
* Shading can reduce evaporation by around 30%.