Zmiany odpływów jednostkowych w nizinnej części Polski w latach 1961–2021
Changes in specific discharge in the lowland part of Poland in the years 1961–2021

Summary/Abstract: The subject of the study was the analysis of changes in water resources in lowland Poland based on the volumeof specific discharge from 39 catchments located on coastlines, in lake districts and in lowlands in the hydrological years 1961––2021. The analyses were based on trends in average annual and monthly runoff from individual catchments, taking into ac-count their statistical significance. Catchments were also clustered using the Ward method in terms of the pace of the observedchanges (slope trend coefficients) in specific discharges in individual months.Approximately half of the studied catchments showed a significant decrease in average annual specific discharges. Nonerecorded a statistically significant increase in this parameter. Most catchments recorded declines in runoff in the spring months(April and May), and four recorded increase in runoff in the winter months (January and February). The most significantchanges in water resources measured by the amount of specific discharge occurred in catchments located in plains characterisedby low natural retention and situated within the lowlands.

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