By Chiara Fiorillo The Environment Agency has issued a flood alert for the River Thames, warning that water levels are expected to rise as a result of spring tides. There is a risk of low-level flooding of riverside roads and open spaces due to the next high tide at London Bridge, which is expected at 3.15am on Sunday. River flows are expected to remain high for the next few days and the Environment Agency said it will continue to monitor the situation, and issue a further update on Sunday morning. The alert covers the area from the Thames Barrier to Putney Bridge in London. It includes the fo…