1. Golder Associates Africa (Pty) Ltd., Surface Water Dept., Golder House, Magwa Crescent West, Waterfall City, Midrand 1685, South Africa; Dept. of Civil Engineering, Univ. of Pretoria, Lynnwood Rd., Hatfield, Pretoria 0002, South Africa (corresponding author). ORCID: .
2. Dept. of Civil Engineering, Univ. of Pretoria, Lynnwood Rd., Hatfield, Pretoria 0002, South Africa.
3. Professor, Dept. of Industrial Engineering, Univ. of Padova, Via Venezia 1, Padova 35131, Italy. ORCID: .