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Doesn't the "lake" get filled with sand eventually? Do you need to then excavate/move it away to maintain effectiveness?
by entee 8y ago
Doesn't the "lake" get filled with sand eventually? Do you need to then excavate/move it away to maintain effectiveness?
- war1025 8y agoI think the idea was the sand is there to start with and the dam is there to hold it back. And then the water gets soaked into the sand and settles into the water table before it evaporates or runs off somewhere else.
- MayeulC 8y agoThey explain in their videos that the dams are there to prevent the sand from running off, which then acts as a sponge/filter to retain water. Having such a huge water supply also helps vegetation, which prevents erosion and helps the soil absorb water, so I guess it's a virtuous circle, at least in theory. Very interesting concept.
- markdown 8y agothatsthepoint.jpg
- 394549 8y ago> Doesn't the "lake" get filled with sand eventually? Do you need to then excavate/move it away to maintain effectiveness? In the video, it seems like the dug wells (or laid piping) in the sand to allow the water to be pumped out from the sand when needed. It seems kinda like an artificial aquifer.