ETH Zurich, Institute of Environmental Engineering Wolfgang-Pauli-Strasse 15, Zurich, 8093 Switzerland
ETH Zurich, Institute of Environmental Engineering Wolfgang-Pauli-Strasse 15, Zurich, 8093 Switzerland ; Department of Water Affairs, Botswana, Private Bag 0029, Gaborone, 0000 Botswana
ETH Zurich, Institute of Environmental Engineering Wolfgang-Pauli-Strasse 15, Zurich, 8093 Switzerland
Techical University of Denmark, Institute of Environment & Resources 115, Rum 154 Bygningstorvet, Lyngby, 2800 Denmark