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Traditional hand-dug wells

815 bytes added, 22:48, 11 April 2012
→‎Avoid contamination
- Greater safety hazards during and after construction <br>
- Difficulty in preventing contamination <br>
- Generally lower rate of inflow for the effort involved. <br>- Smaller wells can dwindle in supply during long dry periods and heavy use, especially in perched aquifer areas <br>- If handpumps are used, all disadvantages related to pumps also relate to boreholes, including operation and maintenance issues, lack ofownership, and spare parts availability <br>- Hand-dug wells near a river can be contaminated by pollution from agricultural runoff in river water <br>- High cost of construction ($1,000 USD or more) – due to construction materials and labour to make a well (about 1 month depending on depth and ease of digging)<br>- Can be difficult to sink to required depth especially in areas of flowing sand <br>- Water levels in the aquifer can drop over time, resulting in possible mining (where aquifer is compressed and cannot hold water any longer afterwards)
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