Abidjan (PAMACC News) - After almost one year of dry spell in Kenya’s Makueni County, rains have finally come down. Now, everything looks green, very green.  But residents know, for sure, that this is a very short-lived spectacle, because two days after the downpour subsides, all seasonal rivers will dry up, and in two months, the sun will be burning with vengeance, upon perched thirsty sandy soils.

That’s why they have invested in sand-dams, as their magic bullet for harvesting the rain water, and using it for another set of months after every rainy season.

The dam is simply a reinforced concrete wall built across a seasonal riverbed. When it rains, the concrete wall gathers sand, which becomes a reservoir for water.

As residents in the entire semi arid Eastern Kenya rush to propagate their seeds following the pounding rainfall, women in Songeni village are completely relaxed. One thing they are sure of is that their sand-dam constructed across Tawa River has already captured millions of litres of water, which the entire village will use for domestic purposes and irrigation for the next one year – if it doesn’t rain again.

“It is the most appropriate way of harvesting water from seasonal rivers in dryland areas,” Simon Middrell, the founder of Excellent Development, a nonprofit organisation that supports rural, dryland communities to work their way out of poverty told delegates at the 2016 Rural Water Supply Network (RWSN) forum in Abidjan.

Since February, when it last rained in Makueni, villagers of Songeni have been farming French beans for export, and other crops for domestic consumption using water from their sand-dam.

And now, Middrell, whose organisation supported the construction of the sand-dam used by Songeni villagers through a local NGO known as Africa Sand Dam Foundation (ASDF) wants the ‘gospel’ of sand-dam construction in dryland areas spread all over the world, especially in developing countries.

However, said Middrell, it cannot be a copy and paste technique. “Sand-dams do not work everywhere. If the place has a lot of clay soil, then the dams are likely going to be silted, and as a result, they will not help the residents,” he warned.

It therefore calls for a feasibility study, so as to be sure that the dam will be able to amass sufficient sand, which acts as a cover for water underneath to protect it from evaporation. It also calls for appropriate technicians to construct it, because the intensity of rainfall in dryland areas is likely to break poorly constructed dams.

“The sand-dams have numerous advantages,” said Middrell. “They form the best bridges in dryland areas because culverts always break during floods. They recharge ground water, water from the dams is safe for drinking, can be used for domestic purposes and by animals both domestic and wild,” he added.

However, Middrell cautioned that without involvement of community members, sand-dam projects are bound to fail because they will lack ownership. “You need to involve the surrounding community, and have them own the project. That way, they will protect it as their property, hence, they will maintain it sustainably,” he told the water form.

So far, Excellent Development has supported construction of over 900 sand-dams in nine countries in Africa, supporting over one million households.