TY - JOUR N2 - Lublin Upland and Roztocze region are known for the occurrence of a large number of springs of high yield. These springs are fed mainly from Cretaceous or Tertiary water-bearing horizon. In order to determine variability of springs’ yield, 61 selected springs were analysed in spring periods of the years 1998–2008. Collected hydrometric materials allowed for comparing average and extreme yield values of springs in various physiographic regions within the period of 11 years. Average value was 76.1 dm3·s–1, while the mean of the minimal yields was 44.7 dm3·s–1 and of the maximal – 132.7 dm3·s–1. Coefficient of irregularity of the springs’ yield ranged from 1.5 to 5.0, which may lead to the conclusion that the springs’ yield is constant or varies slightly. In some cases the irregularity was higher but it was determined by hydrogeological, meteorological and local factors. L1 - http://journals.pan.pl/Content/116937/PDF-MASTER/%5B20834535%20-%20Journal%20of%20Water%20and%20Land%20Development%5D%20Changes%20of%20springs'%20yield%20of%20Lublin%20Upland%20and%20Roztocze%20Region%20in%201998-2008.pdf L2 - http://journals.pan.pl/Content/116937 PY - 2008 IS - No 12 EP - 125 KW - springs KW - yield KW - irregularity of yield KW - Lublin Upland and Roztocze Region A1 - Michalczyk, Zdzisław A1 - Chmiel, Stanisław A1 - Głowacki, Sławomir A1 - Zielińska, Beata PB - Polish Academy of Sciences; Institute of Technology and Life Sciences - National Research Institute DA - 2008 T1 - Changes of springs’ yield of Lublin Upland and Roztocze Region in 1998–2008 SP - 113 UR - http://journals.pan.pl/dlibra/publication/edition/116937 T2 - Journal of Water and Land Development ER -