The UK Climate Impacts Programme (UKCIP) has developed the UK Climate Projections (UKCP09).  These projections of our changing climate provide information for the UK up to the end of this century.  It is expected that average annual rainfall in Wales could increase by up to 20% within 50 years.  Summers will be drier (with baseflows half their current rate), whilst winter rainfall increases significantly.  Sea levels will also rise partly due to melting of polar ice caps.  Drier summers will cause pollution problems in watercourses with reduced flow and increased periodic liberation of pollutants that have gathered during extended drier periods.