Since the beginning of the 1990th agriculture have encountered climate changes which manifested themselves by dry years, less snowy winters and rapid floods even in small rivers. It posed periodical problems in water management because Poland is a country of relatively small water resources and their variable spatial distribution. Actions were undertaken to slow down or hamper water outflow
from natural and artificial running waters, to store waters in small reservoirs and terrain depressions and to increase the retention of water in soils and aquifers. In Poland such actions are termed †œsmall retention† as opposed to water retention in large reservoirs for power production, flood control, drinking water intakes for large cities etc.