Can we restore badly degraded urban lakes?

What is it about?

We investigated the effect of long-term inflow of untreated municipal sewage on the trophic status of the four urban lakes (Mielenko, Karczemne, Klasztorne Małe, Klasztorne Duże) connected by the river into one system. We delineated the catchments and sub-catchments of the individual lakes, to determine their hydrological parameters as well as the physicochemical properties of water in the lakes, their surface inflow and outflow as well as water discharged to lakes from stormwater and drainage ditches.

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Why is it important?

To achieve permanent water quality improvement we recommend the comprehensive protective and restoration actions: constructing pipelines and perimeter drainage ditches with waterproof walls sealed with PVC vinyl sheet piling along the entire lake system; removal of the bottom sediments from Karczemne Lake and some of the bottom sediments from Klasztorne Małe Lake; phosphorus inactivation in the lakes Mielenko, Karczemne and Klasztorne Małe, along with supportive actions in the form of biomanipulation.