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The aim of the paper is the evaluation of the surface runoff impact on chemical composition of waters, transport of suspension and dissolved substances out of the catchment in two left-bank tributaries of the lower Wieprza River – Potok Starokrakowski and Jarosławianka. During the flood discharges were several tens times higher than the average recorded in that period. In Potok Starokrakowski the discharge was 500 dm3/s (typical discharges 10-20 dm3/s) and in Jarosławianka 1500 dm3/s (typical discharges 10-40 dm3/s). The rapid increase in discharge in the streams caused activation of suspension transport in both catchments. In Potok Starokrakowski the suspension content in the flood period was 56.5 mg/dm3, while in Jarosławianka 160.3 mg/dm3. In the flood period, a considerable decrease in the concentration of some dissolved substances, including Na+, Ca2+, Mg2+ and Cl-, was observed. Simultaneously, an increase in the concentration of ammonium nitrogen (NH4-N), potassium, total organic carbon and Kjeldahl’s nitrogen (NK) was observed in both streams. Observed flood had huge meaning in suspended and soluted substances transport outof both catchments.
Key words: the Wieprza River, surface flow, runoff denudation, water chemistry, suspension