Acid mine drainage (AMD) is the main pollutant source in the Odiel river basin (SW Spain). Stream-flow
data constitute a tool to assess the pollutant load transported by the drainage network, as well as to
evaluate the possible impact of restoration measurements along the river. Due to the malfunctioning of
the available stream-gauges and in order to sham the Odiel river behavior, a water model is being elaborated
using the tool SWAT (Soil and Water Assessment Tool), developed by the USDA Agricultural Research
Service. For the first stage of the project we have selected the Meca river watershed, a tributary of the
Odiel river, which is regulated by the Sancho reservoir and whose daily contributions have been used to
both calibrate and validate the model. Obtained results show a well adjustment for wetter years while for
the drier ones higher differences between simulated and measured flows have been observed
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