Established by an act of the local law water–use conditions of water regions that are documents which aim to detail the arrangements approved by the Council of Ministers on 22 February 2011, the Water Management Plans within the Wisła, the Dunaj and the Dniester river basins. The main objective of the development of the water–use conditions of water regions is to create tools to support the achievement of designated in the water management plan (in accordance with the Water Framework Directive) environmental objectives related to water protection and detailing guidelines to issue administrative decisions, setting the scope and form of water use. Water–use conditions of water region, according to the scope specified in Art. 115, Paragraph 1 of The Water Act, define inter alia restrictions on the use of water in the surface water abstraction, discharge sewage into the water and making new water facilities. An important issue related to the above mentioned restrictions are hydrological calculations performed for the purposes of water use, to determine the amount of the instream flow, main flows and probable flows. This article discusses the established guidelines for the hydrological calculations, to be used when applying for a water permit for special use of water.

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