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[[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.]]]
- Popularity of the stone type of bund can result in shortages of stones, resulting in a higher cost for latecomers.
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==Resilience to changes in the environment==
====Drought====
'''Effects of drought''': Lower crop yields.
'''Underlying causes of effects''': Less water to crops from flooding.
'''To increase resiliency of WASH system''': Drought-resistant & fast-growing crops; Diversify livelihoods of farmers.
====Floods====
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.
==Construction, operations and maintenance==
