Changes

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

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