The Impact of the Kowalskie Reservoir on the Hydrological Regime Alteration of the Główna River

Abstract

This paper present an assessment of the impact of the Kowalskie reservoir on the hydrological regime alteration of the Główna river. The Główna river is a right tributary of the Warta river. The Kowalskie reservoir was built in 1984. The area of the reservoir in the normal condition is 203 ha and total capacity is 6.58×106 m 3. The impact of the Kowalskie reservoir on the hydrological regime was made on the basis of RVA method. The assessment was based on the analysis of flow series from the period of 1971-2012. The calculations were done by means of IHA software version 7.1.0.10 developed by The Nature Conservancy (2009). This study indicate that the Kowalskie reservoir has an impact on two group of flow parameters that characterized frequency and duration of high and low pulses as well as rate and frequency of water condition change. The others flow parameters characterized magnitude and duration of annual extreme water conditions are less affected by the Kowalskie reservoir. This study show that Kowalskie reservoir play important role in flood protection. Additionally the reservoir operation has an positive effect on minimum flows characteristic and base flow index.

Heavy Metals in Bottom Sediments of Reservoirs in the Lowland Area of Western Poland: Concentrations, Distribution, Sources and Ecological Risk

“…Reservoirs play important roles in water supply, irrigation, power generation and flood control. However, dam construction changes the hydrological regime and sediment transport [1][2][3]. The suspended sediments are stored in the reservoir and with them pollutants including heavy metals (HMs) [4].…”

“…Their selection was influenced by the time of their construction, different morphometric parameters, catchment land use and hydrological conditions. The objectives of this study are to: (1) analyze the concentrations of HMs in bottom sediments, (2) show the spatial variability of heavy metal concentrations, (3) analyze the bottom sediment contamination, (4) assess ecological risk, (5) identify potential sources and factors determining the content and spatial distribution of HMs in the reservoirs.…”

Effect of Hydraulic Structure on Mitigating Extreme Hydrological Conditions of a Small River in the Temperate Zone (Główna River, Central Europe)

“…The land use structure in the catchment is dominated by agricultural land, accounting for 62%. The Kowalski Reservoir was constructed in 1984 [24] as a result of flooding a natural lake. The Kowalski Reservoir has several functions.…”

“…The Kowalski Reservoir is located in West Poland on the Główna River (Figu The Główna River has its origin in Lake Lednica and flows into the Warta River-the largest river in Poland. Its length is 43 km, its catchment area occupies 235 km 2 , an density of the river network is 1.01 km•km −2 [24]. The land use structure in the catch is dominated by agricultural land, accounting for 62%.…”

“…The Kowalski Reservoir features a two-stage structure: the preliminary rese fulfils the function of a deposition tank closed with a dam in Jerzykowo (Figure 2a) lower reservoir is closed by the frontal dam (Figure 2b). The main features of the rese are presented by Sojka et al [24]: The flooding area for the maximum and normal w levels is 203 and 195.1 ha, respectively; the volume for the maximum and normal w levels is 6.580 × 10 6 and 5.970 × 10 6 m 3 , respectively; the mean depth is 3.1 m; the maxi depth is 6.5 m; and the type of structure is an earth dam. The water surface level v from a minimum of 85.00 m a.s.l.…”