1. a Department of Civil Engineering, Pan African University Institute of Basic Sciences and Technology, JKUAT – Juja Caempus, Juja, Kiambu County, P.O. Box 7722-00300, Nairobi, Kenya
2. b School of Biosystems & Environmental Engineering, College of Engineering and Technology, Jomo Kenyatta University of Agriculture and Technology, Juja, Kiambu County, P.O. Box 62000-00200, Nairobi, Kenya
3. c Department of Agricultural and Biosystems Engineering, College of Engineering and Technology, Jomo Kenyatta University of Agriculture and Technology, Juja, Kiambu County, P.O. Box 62000-00200, Nairobi, Kenya