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The present study focused on evaluating the quality of the Oued Guigou River located in Middle Atlas (Morocco) by studying relevant physicochemical and metallic parameters. Samples for determining the organic matter and trace metal elements trapped in water samples were collected at upstream of Oued Guigou between December 2020 and April 2021. The samples were analysed for physicochemical quality, while the trace metal elements (lead, zinc, copper, chromium, iron, nickel, calcium and magnesium) were determined using ICP‐AES analysis. The results indicated significant organic pollution, as well as standard deviation and average changes in the values of the studied metals, most likely attributable to domestic effluents. The metal content in particular exhibited high values exceeding the recommended Moroccan standard limits, suggesting domestic and agricultural pollution is a potential threat to both the receiving rivers and their associated lakes and reservoirs.

Understanding the impact of climate change on vegetation is essential to manage a new adaptation strategy and preserve the ecology impacted by the flow of suspended matter towards the watercourse. The main purposeof the present article is to study the relationship between the normalized difference vegetation index (NDVI) and the precipitation (P), in the Guigou basin, in the Middle Atlas of Morocco. The analysis of the relationship between NDVI and P was carried out in four phases using GIS and remote sensing tools. The NDVI was derived from Landsat TM 5 (1990), LANDSAT ETM + 7 (2000), LANDSAT TM 5 (2010), and LANDSAT OLI 8 (2020). The data on precipitation were homogenized on 2 monitoring stations of AitKabbach and Aitaissa, from 1990 to 2020, using the regional vector method and the variability. The response of vegetation to climatic parameters was represented using zonal statistics. The results show a decrease in annual precipitation during the period (1990-2020) with an increase in the year 2020. In the annual scale, linear regression reported a positive relationship between NDVI and precipitation. Thus, during the study period, the vegetation growth decreased by approximately 90%, between the years 2000 and 2010, in response to the observed climatic variation. The growth of vegetation is affected by climatic variability, in particular the precipitation. Consequently, the pedo-climatic context, favorable to erosive action and runoff, generates the transfer of eroded particles responsible for the clogging of spawning grounds, where salmonid eggs are deposited, in the Guigou wadi.