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Development of a model for identifying suitable sites for rainwater harvesting for enhancing irrigation: A case study of Ngerengere Catchment

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  • Tasiwuka, Emmanuel
  • Silungwe, Festo Richard
  • Mbilnyi, Boniface Peter

Abstract

A model for identifying sites for in-field rainwater harvesting reservoirs has the potential to enhance irrigation. However, the existing models only identify sites for specific areas and do not address the utility, specifically the appropriate irrigation methods for the identified sites. This study introduces a model for identifying suitable sites for in-field rainwater harvesting reservoirs. The model further identifies appropriate irrigation methods for the identified sites. The model was executed in the GIS model builder. The input parameters for the model are soil texture, land use, rainfall, area of interest and slope. The output is an in-field rainwater harvesting reservoir sites suitability map and a corresponding appropriate irrigation methods map. Thirty reservoirs in the Ngerengere catchment were used for calibrating and validating the model using Google Earth Pro, yielding an overall 84 % prediction accuracy. Model results show 6 %, 84 % and 10 % of the Ngerengere catchment as unsuitable, moderately suitable and very suitable for infield rainwater harvesting reservoirs and irrigation. The model also indicates that 12 %, 61 % and 23 % of the Ngerengere catchment is appropriate for drip, sprinkler and surface irrigation.

Suggested Citation

  • Tasiwuka, Emmanuel & Silungwe, Festo Richard & Mbilnyi, Boniface Peter, 2025. "Development of a model for identifying suitable sites for rainwater harvesting for enhancing irrigation: A case study of Ngerengere Catchment," Agricultural Water Management, Elsevier, vol. 320(C).
    • Handle: RePEc:eee:agiwat:v:320:y:2025:i:c:s0378377425005918
    DOI: 10.1016/j.agwat.2025.109877
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    References listed on IDEAS

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    1. Wanyama, Joshua & Nakawuka, Prossie & Bwambale, Erion & Kiraga, Shafik & Kiggundu, Nicholas & Barasa, Bernard & Katimbo, Abia, 2024. "Evaluation of land suitability for surface irrigation under changing climate in a tropical setting of Uganda, East Africa," Agricultural Systems, Elsevier, vol. 217(C).
    2. Musaed Aklan & Muhammed Al-Komaim & Charlotte Fraiture, 2023. "Site suitability analysis of indigenous rainwater harvesting systems in arid and data-poor environments: a case study of Sana’a Basin, Yemen," Environment, Development and Sustainability: A Multidisciplinary Approach to the Theory and Practice of Sustainable Development, Springer, vol. 25(8), pages 8319-8342, August.
    3. Maria Christoforidou & Gerlo Borghuis & Chris Seijger & Gerardo E. Halsema & Petra Hellegers, 2023. "Food security under water scarcity: a comparative analysis of Egypt and Jordan," Food Security: The Science, Sociology and Economics of Food Production and Access to Food, Springer;The International Society for Plant Pathology, vol. 15(1), pages 171-185, February.
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