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