Evaluation of Flash Flood Impacts on Artisanal Mining Communities in Zamfara State, North West Nigeria

Artisanal mining communities in Zamfara State, North West Nigeria, face compounding vulnerabilities from both toxic exposure and flash flood hazards, the latter exacerbated by the alteration of natural drainage by unregulated excavation. This study evaluates the frequency, severity, and mining-related drivers of flash flood impacts on artisanal gold mining communities in Zamfara State. A mixed-methods approach was employed, combining hydrological assessment of drainage modification by mining with community surveys documenting flood history, physical damage, displacement, and fatalities over the period 2019 to 2024. GIS analysis of satellite imagery was used to quantify changes in drainage channel geometry attributable to artisanal excavation. Results indicate that artisanal pit networks have reduced surface runoff retention by an estimated 34 percent, accelerating peak discharge during intense rainfall events. Communities experienced an average of 3.2 flood events per year during the study period, with a rising frequency trend. Flood-related fatalities directly attributable to pit inundation account for a significant proportion of documented mining deaths. The study identifies community-level early warning mechanisms as absent and emergency response capacity as critically deficient. Recommendations include terrain stabilisation measures, the relocation of active mining areas from flood-prone zones, and community flood preparedness training. Keywords: flash floods, artisanal mining, Zamfara State, drainage modification, disaster risk.