In the 20th c., after the disappearance of the system nuage sofa of small retention (number of artificial ponds, channels etc.) due to economic changes, on the rivers (Kamionka, Czarna Konecka) appeared events previously unknown during swuart the whole Holocene.There are catastrophic flash floods caused by hydrotechnical damage.Geomorphological effects of these floods exceed many times the effects of secular processes.