* Do not site sub-surface tanks in areas of high water tables to reduce risk of flotation.
{{procontable | proborder="1" cellpadding="5" cellspacing="0" align="center"|-! width="50%" style="background:#efefef;" | Advantages! style="background:#ffdead;" | Disadvantages|-| valign="top" | - Less evaporation than natural ponds due to less surface area to depth <br>
- Good for areas where ground would otherwise be permeable <br>
- They work well when privately owned and maintained <br>
| convalign= "top" | - Sub-surface tanks often cannot hold enough water for the whole dry season; making bigger berkeds is possible but is more difficult and expensive; if not affordable it is not replicable.<br>
- Costs currently limit the replicability of the technology for poorer families and the potential to scale things up <br>
- Considerable amounts of silt accumulate in tanks, exactly how much will depend on the area <br>
- When built in a remote area, construction is difficult due to lack of water and large distances to transport materials <br>
- Microbiological and chemical water quality is likely to not be acceptable for direct consumption
}|}
==Resilience to changes in the environment==