See the short documentary here (07:45)
Al Jazeera recently paid a visit to our partners in Kenya, Africa Sand Dam Foundation, to learn how sand dams are transforming people's lives.
The film was shown as part of the Earthrise series - which explores solutions to today's environmental challenges, taking an upbeat look at ecological, scientific, technological and design projects the world over.
Presenter Russell Beard said: "You can see what an incredible, stark difference it is. It's just arid, sandy, dry ground, and there [after the sand dam] is lush, green, the animals are grazing, the trees are green. It's unreal."
A moderate sized dam can supply over a thousand people with a reliable source of water - suitable for domestic use and even commercial agriculture.
Russell Beard, Earthrise presenter