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Evaluation of the potential for the use of lakes in restoring water resources and flood protection, with the example of the Noteć Zachodnia River catchment (Gniezno Lakeland, Poland)

Nowak B., Nadolna A., Stanek P.

Meteorology Hydrology and Water Management. Research and Operational Applications

2018

Vol. 6, Iss. 2

45--58

This paper presents the results of a study aimed at determining the possibility of water retention in the lakes located in the upper and middle reaches of the Noteć Zachodnia River in central-west Poland. The study was conducted on the basis of the analysis of available hydrological data and contemporary and archival topographic basemaps. The research was supplemented by a field study from the years 2011-2016, during which numerous surveys and hydrometric measurements were made. Their goal was to determine the natural range of water fluctuations in the lakes under consideration and to identify potential flows in the Noteć Zachodnia River. Observations and calculations allowed the determination of damming ordinates that are within the range of natural water fluctuations of the lakes. On the basis of this information and the previously prepared model of terrain, including the test area, the authors designated zones within the lakes at the required water level and calculated the useful and flood capacity of those water reservoirs. Subsequently, the possibilities of reducing the flood wave on the Noteć Zachodnia River were determined. Calculations were made for 2011, i.e. a year for which the highest winter spate for over 30 years has been documented. It has been shown that, by using only the flood capacities of surveyed lakes, it would be possible to reduce the flood wave on the Noteć Zachodnia River by 30% for the profile closing its catchment below Kamienieckie Lake. The results indicated the validity of damming the lakes located in the catchment of the Noteć Zachodnia River. Water retention in these lakes would restore the water resources in the area and allow reduction of the flood wave during heavy rains. This action would positively affect the ecosystems associated with the river system and would assist the flood protection system in central and west Poland.

Teoretyczna ocena zwiększenia retencji wodnej na przykładzie jeziora Włókna

Ptak M., Małecki Z. J.

Zeszyty Naukowe. Inżynieria Lądowa i Wodna w Kształtowaniu Środowiska

2014

Nr 10

19--25

Ewolucja jezior prowadzi do zmniejszania jednej z ich głównych cech, jaką jest zdolność retencjonowania wody. Ta szczególna właściwość jezior ma duże znaczenie zarówno dla środowiska naturalnego jak i działalności gospodarczej człowieka. W pracy na wybranym przykładzie jeziora z terenu Wielkopolski, określono możliwość wzrostu zasobów wodnych przy teoretycznie założonych podpiętrzeniach zwierciadła wody o 1 m. W przyszłości wykonanie tego typu prac może okazać się konieczne, aby w pełni utrzymać korzyści wynikające z obecności jezior w środowisku, a wstępna ocena możliwości zwiększenia zasobów wodnych powinna stanowić punkt wyjścia dla bardziej szczegółowych, często kosztownych działań administracyjno-terenowych.

The evolution of lakes leads to the reduction of one of their main properties, i.e. the ability to retain water. This special property is important both for the environment and human economic activity. The present paper examines the theoretical possibility to increase the water resources of lake by pushing up their water level by 1 meter as a result of damming, on the basis of selected lake in Wielkopolska. In the future, such works may prove necessary in order to fully maintain the benefits resulting from the presence of lakes in the environment, while the preliminary assessment of the possibility to increase water resources should be the starting point for more detailed and often costly administrative and field work