In this work analysis and assessment of physico-chemical status and fish structure of the Mała Wełna River for a period of 2000-2009 are presented. Based on the values of oxygen indexes (dissolved oxygen, BOD5 and COD) and biogenic indexes (ammonia nitrogen, nitrate), noted during research period, waters of the Mała Wełna River was classified as moderate quality. Results of the fish structure study carried out on 7 reaches situated along course of the river showed that both abundance and biomass varied among particular measurements points (Shannon's index amount 0.9). Fish population was represented by 18 species, among them in 2008 pike constituted 47% of the biomass but the highest abundance showed sticklebed (32%) Among 18 species occurring in the waters of the studied river 15 of them were classified to a category of lower risk of endanger and 3 as en-danger species. Similar to water quality also ecological status of the river was evaluated as moderate.
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Daily measurements of water levels in water reservoir Domaniów were carry out from 2009 to 2013 year. After analyzing date received it was found that correlation between precipitation and water levels in water reservoir. Besides the highest water level in reservoir in all years there were during the spring season and the lowest water levels in reservoir water during autumn season. It results mainly hence, that during the spring is stronger humidity because except precipitation there are also water from melting snow. Whereas in autumn period is water deficit because the summer was strong evapotranspitation and the soil is very dry. The high water levels in reservoir occur also in other month if at the very intensive rainfalls. It will be described below.
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Irrigation in ornamental plants production is one of the most important factor guaranteed good growth of plants, their high quality and healthiness. Water needed in plants production is divided into two types: water which is needed for irrigation with main sources like streams, rivers, deep wells or even waterworks. Second type of water in plants production is natural precipitation and irrigation. Excess of this water must be drainage and transfer to ditches or retention basins. The aim of this analysis based on two models of ornamental holdings was to point out great possibilities of rainwater retention and its uses for plants irrigation. For this research two modern, different farms were chosen. One of them with greater area of container plant production (16 ha) located near Wieluń city. Other with great area of greenhouse production (3,9 ha) located near Bydgoszcz city. These farms already made some adjustments for rainwater retention from roofs and roads within farms. According to once requirement of water for 1 ha of container plant irrigation which was 21 and 22,5 m3, total yearly amount of water was determined between 2268 and 2430 m3. For greenhouse production once requirement of water for 1 ha plants irrigation was ...
