The rising demand for food production in a changing climate impacts water resources negatively in semi-arid agro-ecosystems. In the Tsavo sub-catchment of Kenya, this is compounded by a surging population and expansion of cropping as a land use; leading to increased abstraction of surface water resources and deterioration of related ecosystem services. The impact of increased abstraction is more profound during water stress seasons when stream-flow levels are low. While water policies have incorporated a requirement for environmental flows, unregulated abstractions persist suggesting an inherent challenge. Drawing on a sample of 279 households, we analysed farmers' engagement in water resources management and explored how this can inform water resource planning. Seasonal water scarcity and user conflicts were the major challenges experienced by the farmers. Ordinal and logistic regression models show that knowledge, attitude and practices were culture-dependent being impacted by educational attainment, level of income, access to extension and membership to local networks. Attitude and practice were further influenced by land tenure and farm distance to water sources. Since knowledge of water management issues informed attitudes and practices, improved awareness and targeted extension support are necessary in the development and implementation of policy decisions on water resources management.2 of 17 water through centralised infrastructure, such as dams, others call for consideration of decentralised on-farm technologies and practices that safeguard ecosystems [7]. There is however, a concurrence that water management approaches must strike a balance between economy and ecosystems [3,17]. Water management interventions are thus perceived as delicate balancing act with many trade-offs, particularly in water stressed river basins where trade-offs are associated with high opportunity costs [8]. While less water for food may condemn many people to hunger, less water for the environment will undermine ecosystems [8,18,19]. However, with increased knowledge of water management, water stressed environments have higher prospects for sustainable agriculture [20]. Water-efficient technologies if integrated with appropriate agronomic practices have the potential to improve food productivity while safeguarding ecosystems [20,21].Water management approaches that focus on decentralised technologies, such as on-farm surface water storage, can improve food production without allocation of additional water from the ecosystems [21,22]. As a result, decentralised water management technologies have received renewed attention in many countries that have acknowledged their contribution in sustainable agriculture [22][23][24]. Moreover, agriculture is now considered both as an integrated system and as an agro-ecosystem, providing services and interacting with other ecosystems [7]. Transitioning to sustainable agricultural water management requires broad understanding and support for changes in water policies [25,26]. However, the proce...