In paper were analysed topical supplies of waters in marshlands, in water-courses, reservoirs and fish ponds on areas of eleven forest inspectorates situated in central parts of the wielkopolskie province. Selected forest inspectorates: Babki, Czerniejewo, Gniezno, Grodzisk, Jarocin, Konstantynowo, Kościan, Łopuchówko, Oborniki, Piaski, Pniewy. These forest inspectorates are situated on areas of twel-fth administrative districts: gnieźnieński, gostyński, grodziski, jarociński, kościań-ski, nowotomyski, obornicki, poznański, szamotulski, śremski, średzki and wrzesiń-ski. Investigated area included about 10 thousand km2, in this forest area about 5 thousand km2. Analysises were concerning to so-called small water retention. This term defining all interventions having in view extension way and time of cir-culation of water in catchments. Usually this is understanding as stopping and dam up waters in water-courses and accumulation her in water reservoirs. To small retention belong water reservoirs about entire capacities < 5 million m3. Ac-tivities in range of small retention serve to improvement of water balance in ca-tchments across enlarging of supplies discretionary waters. Determine also impor-tant element of protection of waters quality. Indicatory value of small water retention water are 6246 m3/km2, in this in marshlands stored water equal 2184 m3/km2. In plans to 2015 foresees on investigated areas of forest ...
The Uroczysko Warta is one of most important concentrations of floodplain forest in Poland. Building of the Jeziorsko reservoir contributed to change of the Warta River regime (limitation of surface overflows, their frequencies), what in consequence negatively influencing on floodplain forest areas. Flood plain forests are the richest and highly picturesque forest ecosystems. Unfortunately, river regulation and flood control contribute to their degradation. In Poland only 0.2% of total area is covered by flood plain forests. The Uroczysko Warta forest district constitutes one of the most important clusters of these sites. The construction of the Jeziorsko reservoir in the middle course of the Warta River has contributed to changes in the river regime (reduced flooding areas and decreased flooding frequency). It seems that the use of simple land improvement systems, i.e. gates, river bars and culverts with flap check valves, may result in the recreation of advantageous hydrological conditions. In such a case storage volume of oxbow lakes would be increased and ground water would be maintained at a higher level over longer periods of time. Planned building of numerous dams on water-courses and devices to dam up water on reservoirs are cheapest methods of enlarging of water ...
The Uroczysko Warta is one of the most important riparian forest areas in Poland. The construction of the Jeziorsko reservoir resulted in changes in the Warta river hydrological regimes. This in turn led to a reduction in the floodplain area and flooding frequency, which as a consequence has had a dramatically detrimental effect on the floodplain forests in that wilderness. Riparian forests are among the richest and most beautiful forest ecosystems. Unfortunately, river regulation and flood control measures result in their degradation. In Poland only 0.2% total area is covered by riparian forests. The Uroczysko Warta is one of the most important groups of these habitats not only in Poland, but also on the European scale. It was assumed that the implementation of simple land and water system restoration systems - gates, barrages, culverts with backwater valve gates - may promote recreation of advantageous hydrological relations. This study presents results of water monitoring in the Uroczysko Warta Wilderness and the volume of deadwood formed as a consequence of hydrometeorological conditions. The paper provides a detailed description of climate characteristics (air temperature and precipitation) in the 30-year period of 1988-2017, i.e. after the commissioning of the Jeziorsko reservoir along with the ...
