The borehole stays open by water pressure. To prevent collapsing fluid-drilled boreholes must be kept full of water during the entire drilling and well installation process. For a 20 m well, one or two barrels are needed, or about 10-20 liters per meter.
{{procontable | proborder="1" cellpadding="5" cellspacing="0" align="center"|-! width="50%" style="background:#efefef;" | Advantages! style="background:#ffdead;" | Disadvantages|-| valign="top" | - Very quick in fine and medium sand formations.<br>
- Very simple and cheap equipment. <br>
- No need for machines. <br>
- Low cost (approx. US-$ 6 per meter of depth including hand pump). This is about 10 times more economical than the least expensive commercially available method.<br>
- Adaptable to other countries and regions with similar soil conditions.<br>
|convalign= "top" | - Generally limited to sandy soils and soft clay.
- Enough working water needs to be available on the drilling location. <br>
- Leaving the borehole open during the night has a risk of collapsing.<br>
- Slower than motorized drilling<br>
|}}
==Construction, operations and maintenance==
