Changes

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.