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Geomorphological and ecological examination of waterbodies facilitates effi cient action aimed at their correct management and attributing proper functions to them or their parts. For years there have been many concepts of the management of numerous post-mining water bodies in Cracow, within the Local Site Development Plan (Miejscowy Plan Zagospodarowania Przestrzennego). Within the borders of the city of Cracow there are several water bodies important and valuable in environmental, landscape, economic and recreational aspect. One of them is the Bagry Reservoir called Bagry Wielkie (the Great Bagry). Nowadays it consists of two parts separated with a dike: the bigger of the area 30.03 ha, fulfi lling the function of sports and recreation as well as economic function (Special Fishery „Wspólnota”, managed by the Regional Board of the Polish Angling Association – Zarząd Okręgowego Polskiego Związku Wędkarskiego Z.O. PZW Kraków/Cracow) and the smaller one – 0.57 ha, for many years being a breeding site of several protected species of birds and fi sh. The knowledge of the geometry of the water basin, characteristics of the bottom (type of the surface, mud) and location of water vegetation, makes base and component of reliable assessment of the state of water environment as well as making proper decisions in the area of the protection of natural resources or revitalization of the water body. This article presents the possibilities of measurement system Lowrence Mark-4, which, apart from hydrographical data, due to specialist algorithm of the interpretation of the return signal, provides numerical information on the hardness of the bottom and the thickness of the vegetation mass on its surface. Measurements made with the application of remote-controlled Smart-Sonar-Boat equipped with sonar Lowrence Mark-4 and GPS R8s Trimble provided important data giving basis to initial assessment of the condition and natural value of this diffi cult-to-access part of Bagry Reservoir. ZALEW BAGRY – CZĘŚĆ 4. ZASTOSOWANIE SONDY AKUSTYCZNEJ LOWRENCE MARK-4 W SZCZEGÓŁOWEJ INWENTARYZACJI TRUDNODOSTĘPNEGO OBSZARU WODNEGO Słowa kluczowe: Zalew Bagry, pomiary hydrografi czne, zastosowanie hydrodronów

The Bagry Reservoir – part 4. The application of acoustic sonar lowrence mark-4 in thorough inventory of a difficult-to-access waterbody