Abstract
The paper presents the results of research, which aimed at tracing the quantitative and qualitative effect of the ”Tomaszowska” urban retention reservoir (located in the Łódź city) on the Olechówka River flowing through it over a period of one day. For this purpose, two measurement-control points were established located directly above the inflow of river to the reservoir, and below the weir. Hydrological and hydrochemical measurements were performed every two hours. Results obtained in this research present the reservoir as an object that in terms of the inflowing river, among others, in a daily balance of pollutants retains mineral and biogenic compounds, and releases dissolved and suspended organic compounds, and also changes the structure of pollution (in the case of total dissolved solids and total nitrogen, increasing the contribution of their organic forms).
Highlights
The Olechówka River in the administrative boundaries of Łódź fulfils the function of a recipient of stormwaters
Research on the Olechówka River showed that the “Tomaszowska” reservoir is an important element affecting river water quality in conditions of water level increases caused by precipitation [1], as well as during the flow of the same part of river water from the „sources” to the mouth – with consideration of the time of water retention in the reservoir [2]
Discharges in the Olechówka River were within the following ranges: 9.4–27.4 L∙s–1 at a mcp C, and 16.0–23.2 L∙s–1 at a mcp D (Fig. 2)
Summary
The Olechówka River in the administrative boundaries of Łódź fulfils the function of a recipient of stormwaters. From the point of view of the state of water quality in the river, the “Tomaszowska” reservoir is the most interesting. The research on the “Tomaszowska” reservoir was based on results of hydrochemical research conducted in 2017 involving the determination of the daily variability of pollution indicators in two profiles established on the course of the Olechówka River, representing the weakest and strongest transformed sections of its channel [3]. Research implemented in 2018 aimed at tracing the quantitative and qualitative effect of the urban retention reservoir on the river flowing through it over a period of one day – with no consideration of the retention time. The consideration of the role of the retention reservoir in the determination of the daily variability of hydrochemical parameters of river waters in the current research aims at capturing this among other factors determining water quality in the urban catchment
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