Disentangling the socio-natural dynamics of drought and water scarcity in Colombia's Tropical Andes

Study region: The Guachal River Basin (GRB), a headwater of the Cauca River in Colombia's Tropical Andes. Study focus: Droughts develop gradually, without clear time-space boundaries, affecting extensive geographical areas. When droughts occur, they exacerbate existing water scarcity, aggravating the negative impacts on vulnerable populations and ecosystems. The drivers of these phenomena are complex, ranging from natural to anthropogenic, and their impacts are cumulative and not structural. This research investigates the socio-natural dynamics of drought and water scarcity in the GRB. We explore these dynamics through secondary data review and stakeholder interviews, capturing perceptions and manifestations of droughts beyond official reported data. The Drivers-Response-Impacts framework is employed to unravel these complexities and offer insights to improve drought and water management. New hydrological insights for the region: Our research reveals that water scarcity in the GRB primarily results from land use changes and water overconsumption by the local elite, who have transitioned to sugarcane farming. ENSO-driven droughts further exacerbate water shortages in the GRB. Policy responses to drought and water scarcity are often ineffective and reactive, addressing only immediate symptoms rather than long-term drivers, such as the role of the elite in perpetuating scarcity. We explore several strategies to enhance water management: exploring new drought indicators, creating comprehensive drought damage inventories, implementing adaptable demand control mechanisms targeting high-volume users, and enhancing stakeholder participation in decision-making processes.