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Traditional hand-dug wells

39 bytes removed, 22:39, 11 April 2012

→‎Avoid contamination

{{procontable | pro=

Circumstances which make the construction of large diameter wells necessary:

 # inability Inability to obtain or maintain pumps or special buckets necessary for small diameter wells# desire to use some type of water Water raising system requiring more space (than is available ) in a small diameter well (, e.g. continuous chain and buckets)# desire Desire to improve or repair existing large diameter wells. # necessity of storing water where Where the aquifer (water storage) is of extremely low permeability # low Low cost labour and skills are available

| con=

- greater Greater effort and longer construction time- greater Greater safety hazards during and after construction <br>- difficulty Difficulty in preventing contamination <br>- generally Generally lower rate of inflow for the effort involved. <br>

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