engleski

The Importance of Controlling Point Sources of Pollution within Small Catchment Areas

Control of point and diffuse sources of pollution due to its nature and the impossibility of complete control, is recognized as problem which needs special attention. Most of this pollution ends up in drainage canals through precipitation or direct discharge. There are large amounts of sediment disposal in the drainage canals of lowland areas where agriculture is the dominant activity, which is even increased by reduced canal maintenance. The amount of sediment is also affected by reduced discharge in the canalas as a result of frequent droughts. In order to analyse heavy metal pollution of sediment in canals, research was conducted in the wider area of the Vuka River Basin, which belongs to the continental area of Croatia. The obtained results showed variable concentrations of heavy metals in canal sediment, especially copper, in years 2020 and 2021. Geodetic surveys of cross- sectional canals profiles, with the aim of monitoring the change in canal geometry in years 2020, 2021 and 2022 were also performed. Weak mobility of sediment pollution due to low water discharge was proven, and the lag of pollution in the sediment and its spread along the channel was confirmed.

Sediment ; Pollution ; Drainage canals ; Heavy metals

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