The aim of this study is to analyse rainfall variability and its impact on
surface water in the Vranso catchment. To achieve this, the methodology
consisted of collecting primary and secondary data. The primary data was
acquired using a survey technique, while the secondary data was based on
meteorological data (rainfall) and a literature review. Data processing was
based on the standardised rainfall index (SPI), the Martonne aridity index
and the standardised flow index. (SFI), and the frequency index (FI). The
study shows that rainfall variability is significant over the period
1985-2014. This variability is reflected in alternating dry and wet
periods. The study also shows that rainfall variability has an impact on
flows in the Vranso catchment. Agricultural activities, gold panning and
livestock farming contribute to the drying up of water bodies in the
catchment. It would be useful for the regional authorities to tackle this
problem by formulating conservation policies for these areas.