This diploma thesis is focused on the analysis of the retention effect on the pitch green roof from the selection of different roof sets. Measurements of retention proparties were performed on four semi-scale testing elements. Monitored period was evaluated during initial growing cycle on extensive, biodiverse and icelandic green roof in comparison with roofing tile surface. The theoretical part describes effective water retention management, historical and present development in the Czech Republic and closed European countries of green roofs
