Sand Dams are Excellent Developments

What is a Sand Dam?

A sand dam is a reinforced concrete wall built across a seasonal sand river. When it rains the dam captures soil laden water behind it – the sand in the water sinks to the bottom, whilst the silt remains suspended in the water.

Research shows that only 1 to 3% of rainwater is retained behind any individual dam, the remainder continues its natural flow towards the ocean. Eventually the dams fill with sand - sometimes after only one rainfall or over 1 – 3 seasons.

25 to 40% of the volume of the sand held is actually water and a mature sand dam can store millions of litres of water, refilling after each rainfall providing a year round supply of clean water to whole villages.

How was the Wasya wa Athi B SHG Dam Funded?

The dam was funded by a Rotary Global Grant, an explanation of which can be viewed on the page entitled Global Grants.

Here are two explanatory videos for your enjoyment