**Author details**

Joe Magner1 and Modreck Gomo2 \*

1 Department of Bioproducts and Biosystems Engineering, University of Minnesota, St. Paul, MN, USA

2 Faculty of Natural and Agricultural Sciences, Institute for Groundwater Studies, University of the Free State, Bloemfontein, South Africa

\*Address all correspondence to: gomom@ufs.ac.za

© 2019 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/ by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
