This SPOT 6 image taken 27 April 2016 shows the Gariep Dam, near the town of Norvalspont, bordering the Free State and Eastern Cape provinces. The Dam, opened 1972 is the largest in South Africa and is primarily purposed for irrigation, domestic and industrial use as well power generation. In satellite imagery clear water absorbs most of the wavelengths in the electromagnetic spectrum thus appearing dark. In this example, water in the reservoir (i.e. west of the Dam wall) appears green and brown in the Orange river. The differences in colour are due to the amount of sediment concentration in the water. SANSA Earth Observation call on all South Africans to conserve our precious water resources. For more information on water conservation please visit Rand Water’s Water Wise website from the link provided below.
Image credits: Produced at SANSA Earth Observation. SPOT6: Copyright © Airbus DS 2013. All rights reserved.