Failure to control the growth of blue-green algae could threaten its use as a venue for the 2012 Olympics. Swimming is banned in the lake as the algae can cause skin rashes and eye irritation vomiting and diarrhoea. The lake is to be used for the 2012 triathlon and the 10km marathon swim.
The Environment Agency recommends using barley straw to control blue-green algae. This method keeps the water fresh at Henleaze Lake in Bristol and at the Children’s Bathing Beach at the Cotswold Water Park.