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Traditional hand-dug wells

18 bytes removed, 22:34, 11 April 2012
→‎Avoid contamination
# inability to obtain or maintain pumps or special buckets necessary for small diameter wells
# desire to use some type of water raising system requiring more space than is available in a small diameter well (e.g. continuous chain and buckets)
# desire to improve or repair existing large diameter wells. iv. # necessity of storing water where the aquifer is of extremely low permeability # low cost labour is available# local and skills are available.
| con=
- greater effort and longer construction time
Winona
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