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Traditional hand-dug wells

12 bytes removed, 22:29, 11 April 2012

→‎Avoid contamination

Circumstances which make the construction of large diameter wells necessary:

i. # inability to obtain or maintain pumps or special buckets necessary for small diameter wells ii. # 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) iii. # desire to improve or repair existing large diameter wells. iv. necessity of storing water where the aquifer is of extremely low permeability v. # low cost labour is available vi. # local skills are available.

| con=

- greater effort and longer construction time

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