In the 20th c., after the disappearance of the Engraved Leather Wallet_NEW system of small retention (number of artificial ponds, channels etc.) due to economic changes, on the rivers (Kamionka, Tubing:Other Pipe, Hose Czarna Konecka) appeared events previously unknown during 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.