Department of Mathematics and Statistics;
University of Energy and Natural Resources;
Sunyani;
Ghana;
Department of Statistics;
University for Development Studies;
Navrongo;
Ghana;
Department of Energy and Environmental Engineering;
University of Energy and Natural Resources;
Sunyani;
Ghana;
River; Discharge; GAMM; Tensor; Product; Smooth; Space-Time; Interaction; Black; Volta; River;