Open AccessAnalysis of the use of selected reservoirs in the Wielkopolska province
Author(s) -
Błażej Waligórski,
Mariusz Sojka,
Joanna Jaskuła,
M. Korytowski
Publication year - 2018
Publication title -
annals of warsaw university of life sciences-sggw. land reclamation
Language(s) - English
Resource type - Journals
eISSN - 2081-9617
pISSN - 1898-8857
DOI - 10.2478/sggw-2018-0029
Subject(s) - inflow , hydrology (agriculture) , water reservoir , outflow , environmental science , water level , vegetation (pathology) , geology , physical geography , geography , oceanography , geotechnical engineering , petroleum engineering , medicine , cartography , pathology
The paper presents characteristics of six selected retention reservoirs located in the Wielkopolskie province, i.e. the Radzyny and Przebędowo reservoirs located near the city of Poznań, the Miedzichowo reservoir situated at the western border of the province, as well as the Stare Miasto and Jutrosin and Pakosław reservoirs, situated at the eastern and southern parts of the province, respectively. The paper also presents results of studies concerning water quality parameters in the selected reservoir of Przebędowo (at the inflow, within the reservoir and at the outflow) for the example year of 2016. The greatest water area of approx. 110 ha and at the same time the greatest capacity (2.88 million m 3 ) at normal level damming (NLD) was found for the Radzyny reservoir on the Sama river, constructed in 2000, whereas the smallest water area (5.3 ha) and the smallest capacity (0.1 million m 3 ) at NLD were recorded for the Miedzichowo reservoir, which was constructed in 2013. Apart from the positive aspects related to the operation of water storage reservoirs we frequently observe problems with their operation and use. In the winter periods they are mainly connected with the so-called icing, which has a negative and often destructive effect both on the condition of reservoir dams and on their banks. In turn, in the summer months a common problem in the operation of reservoirs results from obstruction from vegetation accumulated on the damming structures, which frequently reaches the dams particularly in periods characterised by high daily precipitation totals. Another common problem in terms of the operation of retention reservoirs is also related with the process of their eutrophication, connected with the influx of biogens. Analyses of selected water quality indexes for the Przebędowo reservoir showed, particularly in relation to nitrates and nitrites, their higher values at the inflow to the reservoir, indicating a considerable effect of land use in adjacent areas primarily in terms of fertilisation and the resulting runoff of biogens to the watercourse supplying the reservoir.