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{{Climate_change
|heading1= Drought
|text1='''Effects of drought''': Lower crop yields. <br>'''Underlying causes of effects''': Less water to crops from flooding. <br>'''To increase resiliency of WASH system''': Drought-resistant & fast-growing crops; Diversify livelihoods of farmers.
|heading2= Floods
|text2= When a region with bunds floods, strengthen the existing bunds by raising them several feet, otherwise breaches are possible. This is especially important when bunds are used to protect crops or urban/residential areas.
}}
[[Image:Bund.JPG|thumb|right|350px| Near a bund wall. Photo courtesy of [http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=9&ved=0CGsQFjAI&url=http%3A%2F%2Fwww.arcworld.org%2Fdownloads%2Fsmart%2520water%2520harvesting.pdf&ei=NXNzT7CYEIiTiQKdxviYCw&usg=AFQjCNECS9O4gaRRQadp5dd4B5RDPxTwQA&sig2=QwWuUbra7my8Dpq5c_0baw ''Smart Water Harvesting Solutions]]]
[[Image:TrapezoidalBund.JPG|thumb|right|350px| Shape of a trapezoidal bund system with slope direction down. <br> Drawing: [http://www.fao.org/docrep/U3160E/u3160e07.htm#5.6%20trapezoidal%20bunds FAO: Water Harvesting.]]]
==Suitable conditions==
* Locate bunds in natural runoff areas, preferably in sites already shaped by topography – indicators include seeing where water flows during flood times, and soil / vegetation types. The key is to approach each site individually and to work with natural topographical features – experience in the area will influence the design.