The study is focused on the evaluation of crayfish physiological reaction on hygienically treated water with chlorine dioxide (ClO2). A patented non-invasive monitoring system was used for observation of crayfish cardiac and locomotor activity. Monitoring was conducted from February to August 2017 under conditions of private commercial enterprise "Pivovar Protivín" in Czech Republic. Adult individuals of signal crayfish, Pacifastacus leniusculus, were kept separately in water-flow aquariums directly after the water treatment device producing ClO2 in concentration from 0.01 to 0.29 mg.l-1. Observed crayfish response to the disinfectant varied among individuals which could be explained by a different functional state and individual reaction on stimuli. Diurnal rhythm of some crayfish was disturbed even at a lower concentrations of chlorine dioxide (0.01-0.2 mg.l-1), while higher concentrations affected all animals. In addition to that, higher levels of chlorine dioxide ( 0.2 mg.l-1) significantly increased mortality. Maximum concentrations (0.2-0.29 mg.l-1) were observed 28 times in total during 202 days of monitoring, which resulted in 25 mortality cases occurred several days after exposure. In average, mortality of crayfish occurred three-four weeks after stocking to the experimental system. Possible lethal concentration of ClO2, which caused animal mortality, is 0.2 mg.l-1. Results suggested that crayfish exposure to ClO2, obviously, negatively affect their physiological processes; however, further studies are needed to examine specific effects of chlorine dioxide on internal organs of crayfish.

The Káraný waterworks supplies drinking water to approximately one third of its total consumption in Prague. It uses two main ways to produce drinking water: artificial infiltration and bank infiltration. Two-year monitoring of the content of 90 drugs and metabolites evaluates the occurrence of these substances in the Jizera River and in both production processes. The results of the monitoring point to a systematic occurrence of drugs in the Jizera River under Mladá Boleslav in concentrations ranging from tens of ng / l to hundreds of ng / l (Acesulfan and Oxypurinol). Artificial infiltration failed to remove six drugs from water (Primidon, Sulfamethaxxazole, Carbamazepine, Lamotrigine, Ibuprofen, Gabapentin, Acesulfan and Oxypurinol). Only four drugs (Ibuprofen, Caffeine, Oxypurinol and Acesulfan) were found in the results of monitoring from bank infiltration. This makes bank infiltration a more effective method of drug elimination than artificial infiltration. Keywords: drugs, drinking water, statistical analysis, monitoring

This thesis presents the mapping and drafts of the modification of water springs in the school forest district of Valšovice which belongs to the the Secondary Forestry School in Hranice. The goal of the thesis was to make laboratory analyzes, annual monitoring of natural springs, measurement of the spring intensity, temperature, pH and oxygen content. The values have been evaluated and shown in tables and graphs. The thesis contains proposals of modifications of all the natural springs there. The proposal of the chosen spring is complemented by a graphical representation and a hand sketch presenting the location of the modify natural spring, information panel and a bench in the area where the spring is located. Furthermore the thesis looks into the proposal of the widening of the existing nature trails of Valšovice where the springs are located and the proposal of information panels of the natural trail.

This thesis evaluates the potential retention in the catchment area of the Barchov brook, in its components parts. For identifying and evaluating hydrological characteristic, it was first necessary to mapping the area in terms landscape cover, topography terrain, soil properties and divided it into individual sub-basin. This data was processed in the ArcGIS version 10.0. The output of which were characteristics for each sub-basin such as: the length of the stream, the slope of the stream, size area, slope area, 1-day maximum rainfall amount, surface roughness and runoff curve number CN, which entering into the hydrological model DesQ-MaxQ. The output of the model were hydrological characteristics of the river sub-basin with the values the size of the potential retention, the volume of runoff, percentage of the stored water, flood wave volume, time of concentration and maximum flow. When evaluating the individual hydrological characteristics were taken into account morphological, soil, landscape and vegetation properties of the specific sub-basin.

This diploma thesis deals with the monitoring of selected headsprings in the administration of the Lesy města Brna in the northern district of Brno-venkov, describing their current state and proposals for their reconstruction. The basis of the work was to measure the basic parameters of water quality - water temperature, pH, saturation of oxygen and yield measurements of water sources, taking samples for laboratory analysis. Based of measured values there were compiled charts and graphs, and the water quality evaluation of individual headspring. The most important part of this work is to design the general reconstruction of one of the monitored headsprings and suggestions of installation of benches and information boards, there are alsodrawing annexes of the individual proposals and map annexes.

Minimisation of environmental impact is a key factor in insuring the long-term sustainability of the aquacultural industry. Numerous studies have examined nutritional strategies as a means of reducing waste production and minimising the environmental impact of aquacultural waste. To achieve this goal, it is the challenge to the aquacultural industry to develop "environmentally friendly" feeds, feed management and feed production methods to reduce pollution. This applies mainly to pond farming of common carp, which plays an important role in global aquaculture. The objective of this Ph.D. thesis was to evaluate the possibilities of using modified cereals in pond aquaculture. It focused on issues that contribute to a better understanding of the interconnection between fish production, feed quality and applied feeding technologies with respect to water quality, nutrient budget, quality and quantity of natural food.

The diploma thesis is based on long-term monitoring of small watersheds in the Šumava region, differences and trends in the water chemistry in the years 1998 - 2015 and the differences in water balance and erosion of solutes in the years 2008 2015 are evaluated. Comparing average rainfall-runoff relationship on the catchments revealed little difference between the basins of the Horský (wetland) stream (runs off 37 %) and Bukový (forest) stream (32 %), while the basin of Mlýnský (drained pasture) creek runs off 60 % of incident precipitation. Basin of drained pastures Mlýnský - showed worsening of the parameters, which are expressed in lower proportion of water retained in the basin and also a higher proportion of dissolved solids in the effluent water. This corresponds to the overall erosion of substances from the basin, which is evident from the results, both forest and wetland basin matters detained while the drained basin is losing them for a long time. Only in the case of nitrate, ammonia, Ca2+ and Mg2+ loads from the forest and wetland basin are three times lower than the load from the drained pastures. For PO43- it is about one third less and in the case of SO42-, Cl-, K+ and Na+ it is about one half less.

The object of my thesis was to document the basic characteristics of four small ponds. Register seasonal changes in the occurrence of selected zooplankton groups and compare individual ponds among them. Then evaluate management on ponds and assess the possible impact on the formation of plankton. These results were then compared with the current situation on standard economic ponds. In this study, I observed three private ponds and local pond, which were located in the cadastral area Lodhéřov. From the results it is evident, that the zooplankton development was in private ponds very slow, while at local pond was developed zooplankton quickly. The diversity of zooplankton species was higher in local pond. On private ponds showed a high increase in fish, which amounted to R1 597 kg/ha and R3 519 kg/ha. In terms of management of ponds R2 was the least effective because the gain was only 113 kg/ha. Private ponds, according to the average annual ration 2910 kg/ha still ranked in halfintesification, while local pond to intensification ration with 4557 kg/ha.

Since the year 2013 there is going a hydrobiology monitoring of some selected ponds in Duchcov. It is Rybochovný n. 1, Rybochovný n. 2, Rybochovný n. 3, Kravský, Růžový, Dubský and Barbora onces, when all ponds were for some time monitored in basic hydrochemical parameters: temperature, alkalinity, conductivity, oxidation reduction potential, dissolved oxygen concentration in water, transparency and turbidity. I examined seasonal change in phytoplankton and zooplankton composition. I compared my results with data from previous years. In these ponds is a risk of eutrophication, resulting in the occurrence of algal blooms. Several situations with the occurrence of algal bloom was observed during monitoring. This would may be problem for ecological conditions of pond´s reservoirs, also for fish composition because of oxygen out-pumping. There weren´t noticed extreme changes during pH monitoring, even so it is important to monitor the supply of nutrients and in case of deflection to make various steps.

This thesis deals with a capacity problem with the sewage system in the city of Ceska Skalice in the Czech Republic. With the knowledge of the sustainable drainage urban system (SuDs) a technical solution of dealing with the insufficient capacity of the sewage system without having to change the sewage system can be designed. This thesis first of all, describes what SuDs is and how this particular system is applicated within the Czech Republic. There is also description of the stormwater and its impact on sewage system in the urban areas. The second part of the work contains case study of applying chosen SuDs solution to solve the problem in the Ceska Skalice sewage system. There is the comparison of the condition of the sewage system beforehand and after applying the SuDs. The concluding part of the thesis presents the results however, pros and cons of using the SuDs approach to improve better urban drainage system.