• Doctor of Philosophy Degree (PhD) in Agricultural Engineering, Egerton University, Kenya. 2016
• Master of Science Degree in Agricultural Engineering, Egerton University, 2008
• Bachelor of Science Degree in Agricultural Engineering, Egerton University 2004

• Member: Institution of Engineers of Kenya, 2021 (GIEK Membership No. G.9347)
• Member: Kenya society of agricultural and biological and Environmental engineers (KeSEBAE) K20092)
• Member:(MIAgrE) Registered as an international Member of Institution of Agricultural Engineers (MIAgrE) as a member in 2016 (Membership No. 42668)
• G. Reg. Engineer: Engineers Board of Kenya (EBK) 2011 registered Engineer G. Reg. EBK (Membership No. B 6731)
• Member: The World Association of Soil and Water Conservation (WASWC), registered as a member in 2007.
• Member: Registered with the Kenya Society of Agricultural Engineers (KSAEw), 2007
• Member: Registered as a Member of Eastern Africa Water Association (EAWA), 2008
• Member: Registered with Greater Horn of Africa Rainwater Partnership (GHARP) Kenya Rainwater Association (KRA): Promoting Rainwater-Harvesting and Utilization, 2011

1. Raphael M. Wambua, Thomas Akuja and Rachael M. Sevu (2025). Contract Farming Technologies, Opportunities And Challenges In Arid And Semi-Arid Lands-A Review Scenario in Kenya-International journal of Agriculture and Technology, 5(2): 1-7
2. Sousa, L. S, Raude, J. M., Wambua, R. M and Mutua B. M. (2025). Sediment Characterisation of Unlined Water-canal in Chókwè Irrigation Scheme, Mozambique Using Multivariate Statistical Analysis, International journal of Agriculture and Technology, 5(2): 1-12
3. Hellen Sang, Raphael M. Wambua, Romulus Okwany (2025). Simulated Scenarios Of Soil Water-Wetting Patterns Of Surface Drip Irrigation System Using Hydrus 2D Model, International journal of Multidisciplinary Research and Publications, 7(11): 418-424
4. Amisi E. O., Kundu P. M. and Wambua R. M. (2024). Simulation of Spatio-Temporal Dynamics of Streamflow to Climate Variability in Njoro River Catchment, Kenya, Journal of Engineering in Agriculture and the Environment (JEAE), 10(2): 70-90 https://kesebae.or.ke/journal/index.php/kesebae
5. Sang H., Okwany R., Wambua R. M (2024). Effect of Different Soil Wetting Patterns on Water Availability to Watermelon Crop and its Productivity, International Journal of Applied Sciences: Current and Future Research Trends (IJASCFRT), 21(1): 47-62 https://ijascfrtjournal.isrra.org/index.php/Applied_Sciences_Journal/article/view/1438
6. Sang H., Okkwany R., Wambua R. M (2024). Estimation of Soil Wetting Pattern Using Different Irrigation Regimes in Conjuction with Super Absorbent Polymer, Journal of Engineering in Agriculture and the Environment (JEAE), 10(2), 46-59, https://kesebae.or.ke/journal/index.php/kesebae
7. Onyango E. A, Wambua, R. M. and Otieno, H (2024). Forecasting of Flood Events for Water Resources Management in Gucha-Migori River Basin, Kenya, Journal of Engineering in Agriculture and the Environment (JEAE), 10(2), 1-18, https://kesebae.or.ke/journal/index.php/kesebae
8. Oduor B. O.,Mutua, B. M., Wambua, R. M. (2023). Evaluation of the Streamflow Response to Agricultural Land Expansion in the Thiba River Watershed in Kenya, Journal Agricultural & Rural Studies, 1(2), https://doi.org/10.59978/ar01020011
9. Oriosa A. A, Wambua, R. M, and Okwany R. O. (2023). Modelling Of Potato Crop Water Productivity And Yield Response Under Subsurface Drip Irrigation System, Journal of Engineering in Agriculture and the Environment (JEAE), 9(1), 74-86. https://kesebae.or.ke/journal/index.php/kesebae/article/view/73
10. Kamilo M.B.A., Okwany R. O., Wambua, R. M. (2022). Effect Of Deficit Sub-Surface Drip Irrigation on Growth Characteristics and Yield, International Journal For Research in Agricultural and Food Science, 8(3): 1-13.
11. Nyokabi E. W, Wambua RM. Okwany R O. (2021). Evaluation of Spatial and Temporal Hydrological Drought Using Surface Water Supply Index in Malewa River Catchment, Naivasha” Journal of Engineering in Agriculture and Environment (JEAE), 7(2): 1-14
12. de Sousa, L.S., Wambua, R.M., Raude, J.M., Mutua B. M. (2021). Cohesive and non-uniform sediment characteristics in the unlined canal of Chókwè Irrigation Scheme, Mozambique. Journal of Sediment. Environments.. https://doi.org/10.1007/s43217-021-00058-3
13. Kinyanjui, S. M., Onyando, J. O. and Wambua, R. M. (2021). Quantitative Analysis of Geomorphologic Characteristics of Amala River Catchment in Kenya, Journal of Engineering Research and Reports, 20(2), 91-106
14. Nyokabi, E. W., Wambua, R. M. and Okwany, R. O. (2020). Assessment of rainfall, streamflow and reservoir level trends for malewa river catchment, Naivasha, Kenya, Journal of Civil, Construction and Environmental Engineering (JCCEE), 6(1); 1-8.
15. Sang H., Wambua, R. M. and Raude J. M. (2020). Yield response, water use and water productivity of tomato under deficit sub-surface drip irrigation and mulching, Journal of sustainable research in Engineering, 6(2): 47-55
16. Lateiro S. S, Wambua, R.M, Raude, J. M. 3 and Mutua, B. M. (2020). Water Flow and Sediment Flux Forecast in the Chókwè Irrigation Scheme, Mozambique, Journal of Water Resource and Protection (JWARP, 12(12):1089-1122.
17. Amisi E. O., Kundu P. M. and Wambua R. M. (2020). Modeling climate variability influence on river regime in upper Njoro catchment, Kenya, Journal of Civil Construction and Environmental Engineering, 5(5): 126-137.
18. Wambua, R. M. (2020) Development of a Non-linear Integrated Drought Index (NDI) for managing drought and water resources forecasting in the Upper Tana River basin-Kenya, International journal of environmental sustainability and green technologies (IJESCT), 11(1): 15-33.
19. Sang, H. J., Wambua, R. M. and Raude, J. M. (2020). Modelling tomato water productivity using Acquacrop model in Njroro Sub-county, Nakuru, Kenya, Journal of Engineering research and Reports, 10(3): 1-13.
20. Wambua, R. M. (2019). Hydrological drought forecasting using modified Surface Water Supply Index (SWSI) and Stream Flow Drought Index (SDI) in conjunction with Artificial Neural Networks (ANNs), International journal of service science, management, Engineering and Technology (IJSSMET), 10(4): 39-57.
21. Kilongosi C, Raude J. M., Wambua, R. M., Malesu, M. and Oduor, A. (2019). Assessment of the best moisture conservation in Sorghum production under spate irrigation; a case study of Ewaso Nyiro South Drainage Basin, Journal of sustainable research in engineering, (5(1): 12-24.
22. Wambua, R. M. (2019). Drought estimation-and-projection using standardized supply-demand-water index and artificial neural networks for upper Tana river basin in Kenya, International journal of applied geospatial research (IJAGR), 10(4): 11-27.
23. Lateiro de S., Wambua, R. M., Raude, J. M. and Mutua, B. M. (2019). Assessment of water flow and sedimentation processes in irrigation schemes for decision-support tool development: a case review for Chókwè Irrigation Scheme, Mozambique, AgriEngineering Journal 2019, 1(8), 100–118.
24. Wambua, R. M. Mutua, B. M. and Raude, J. M. (2018) Detection of Spatial, Temporal and Trend of Meteorological Drought Using Standardized Precipitation Index (SPI) and Effective Drought Index (EDI) in the Upper Tana River Basin, Kenya, Open Journal of Modern Hydrology 08(03):83-100

TEXTBOOKS PUBLISHED

1. Wambua R. M. (2023). Engineering Research Methods, GRIN Verlag publishers, ISBN (eBook): 9783346812643/ISBN (Book): 9783346812650, Munich Germany, G. Verlag
2. Wambua, R. M. (2020). Soil and Water management, An introductory textbook, G. Verlag publishers, ISBN(pdf): 9783346243973, ISBN (Book): 9783346243980, Munich Germany
3. Wambua, R. M. (2019). Irrigation principles, Theory and applications, G. Verlag publishers, Munich, ISBN: 9783668919983

CONFERENCES, SEMINARS, WORKSHOPS ATTENED AND PARTICIPATED

1. Hellen Sang, H., Okwany, R., Wambua R. M. (2025). Optimization Of Surface Drip Irrigation (SDI) System Variables For Watermelon Crop Water Productivity In ASALS, KeSeBAE Annual conference 23rd -25th April 2025, UoN Towers, Nairobi
2. Oriosa A., Wambua R. M. (2022) Simulation Of Crop Water Productivity And Yield Response Of Potatoes Under Subsurface Drip Irrigation System Using The Aquacrop Model, South eastern Kenya University 1st research and conference, Nov 14-18, 2022
3. Alele., J. and Wambua, R. M. (2022). Impact of Agricultural Mechanization on Livelihoods of Women and Youth in Kenya, Conference on Agricultural Mechanization” in African Countries, 9th to 11th May 2022, Egerton University.
4. Nyokabi, E. W, Wambua, R. M & R.O. Okwany (2022). Forecasting of hydrological drought using surface water supply index and streamflow drought index at Malewa River Catchment, Naivasha, Kenya, Egerton university, 14th biennial international conference, 23rd-25th March
   POSTGRADUATE STUDENTS SUPERVISED
5. Hellen Sang, PhD Thesis title, Modeling Water Distribution Under Different Irrigation Regimes, Oral examination conducted in March 2025; revision ongoing
6. Lateiro Salvador de Sousa, PhD, Thesis title ‘ assessment of temporal trend-dynamics of water flow and sediment flux for Chókwè irrigation scheme in Gaza Province, Mozambique’, graduated 2021.
7. Kamillo Macham Barach Atem, MSc. Thesis title, Effect Of Deficit Sub-Surface Drip Irrigation On Growth Characteristics And Yield Of Okra Crop, graduated, 2023
8. Edith Auma Onyango, MSc. Thesis title, Modelling And Forecasting Of Flood Events In Gucha-Migori River Basin, Kenya-ongoing Graduated November 2024.
9. Aneck Agisa Oriosa. MSc. Thesis title, Water Productivity Of Potato Production Under Deficit Sub-Surface Drip Irrigation And Super Absorbent Polymer In Njoro, Kenya- graduated November 2024.
10. Nyokabi E. W. MSc Thesis title, Evaluation and Forecasting of Hydrological Drought Using SDI and SWSI In Malewa River Catchment, graduated 2022
11. Amisi E. MSc Thesis title, Evaluation and Forecasting of Climate Variability Impact On Spatio-Temporal Distribution of Stream Flow in River Njoro Catchment, Kenya, graduated 2021
12. Kinyanjui S. M. MSc Thesis title, Modelling Surface Water Flow for Ungauged Sites Within the Upper Mara River Catchment Using Geomorphologic Characteristics, graduated 2021
13. John Twesige, MSc Thesis, Title, Hydrological Response to Land use and Land Cover Change (LULC) in Katonga River Basin, Uganda, (MSc Water Resources- PAUWES- University of Tlemcen ) completed 2019
14. Kilongosi C. M. MSc. Thesis, Title ‘Estimation of Crop Water Requirement and spate irrigation demand using remote sensing and geographic information system in Kwenia sub-catchment, Kajiado County’ completed 2019
15. Leah Amisi, MSc Thesis, Title, Response Of Event-Based Soil Hydrological Functioning To Land Use In Upper River Njoro Catchment, Graduated 2019
16. Francis Musyoka. MSc. Thesis, Title ‘Assessing the Impact of Climate Change on Hydropower Generation in Kenya’: (MSc Water Resources)-Completed 2017
17. Brian Omondi, MSc. Thesis, Title ‘Modelling the Impacts of Expansion of Mwea Irrigation Scheme on the Flow Regime of Thiba River, Kenya Using HEC-GEOHMS/HEC-HMS’Completed-2017
18. Johnstone Mainye, MSc. Thesis, Title ‘Modelling the Effect of Rainfall Magnitude on Runoff, Soil Erosion and Sediment Yield in Sosiani Catchment In Kenya Using ArCSWAT’ ‘Completed 2017

SELECTED RESEARCH GRANTS/ PROJECTS UNDERTAKED

1. Kenya Climate Smart Agriculture Project (KCSAP) on Validation of mechanized soil and water conservation approaches for sorghum production in the ASALs of Kenya project 2020-Co-PI of the project
2. Strengthening Capacities for Agricultural Education, Research and Adoption in Kenya (SCARA) SCARA-Appear Project- completed in 2019
3. South Eastern Kenya University (SEKU) Engineering resources/equipment support by African Development Bank (AfDB) through MOHEST project 2010-2013

P.O. Box 170 - 90200 Kitui – Kenya
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