Sand Dams are Excellent Developments

Presentation given by David Jordan OBE, Chairman of Excellent Development. David's slides show messages from the Wasya wa Athi self-help group that our actual donations helped following a presentation by Sir Edward Clay in 2012.

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

Click on the Full Screen icon to view them in full size.  At the end of each video, you will be given the chance to watch more videos from the same series.

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