Long-term changes in runoff from a small agricultural catchment

Kazimierz Banasik and Leszek Hejduk
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Kazimierz Banasik: Department of River Engineering, Faculty of Civil and Environmental Engineering, Warsaw University of Life Sciences - SGGW, Warsaw, Poland
Leszek Hejduk: Department of River Engineering, Faculty of Civil and Environmental Engineering, Warsaw University of Life Sciences - SGGW, Warsaw, Poland

Soil and Water Research, 2012, vol. 7, issue 2, 64-72

Abstract: River runoff is an important indicator of environmental changes, which usually include climate and/or land use changes, and is also the basis of catchment water management. This study presents results of monitoring and analysis of 48-year precipitation and runoff from a small agricultural catchment located in central Poland. No land use changes in that period have been reported. Mean monthly distributions of precipitation and runoff for the long-term period showed that July was the wettest month in respect of precipitation and a drier one in respect of runoff, averaging 12.9% and 5.2% of their annual values, respectively. To evaluate the trend of three annual hydrometeorological parameters, i.e. precipitation, runoff and runoff coefficient, the Mann-Kendall test was applied. It indicated no trend in respect of precipitation, and decreasing trends of runoff and runoff coefficient at a 95% level of significance. Linear approximation of the annual runoff values indicated a decrease in runoff of ca. 1.2 mm per year for the analysed period. A few other functions were also used for better approximation of runoff data.

Keywords: climate change; Poland; runoff variability; small watershed; trend analysis (search for similar items in EconPapers)
Date: 2012
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Persistent link: https://EconPapers.repec.org/RePEc:caa:jnlswr:v:7:y:2012:i:2:id:40-2011-swr

DOI: 10.17221/40/2011-SWR

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