Rappbode Reservoir (image) Helmholtz Centre for Environmental Research - UFZ Share Print E-Mail Caption The Rappbode reservoir in the Harz region -- it also is affected by the increasing brown colouration of the water. It is one of 36 reservoirs in Germany which have been studied by UFZ scientists in order to identify the causes of increasing brown colouration. Credit UFZ / André Künzelmann Usage Restrictions None Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.