In the Czech Republic, the constructed wetlands (CWs) have been used as wastewater treatment technologies since 1989. They are usually designed for small communities to 500 PE exceptionally to 2 000 PE. At present, about 300 CWs are in operation in the Czech Republic. Majority of them are designed with horizontal subsurface flow, while vertical subsurface flow (VF) constructed wetlands are still rarely used. Compared to abroad, vertical filters (beds) in the Czech Republic are only a new technology. Proof of this are the results from the largest vertical filter operated at CW Dražovice for 850 PE. The technology of vertical filter has great potential to improve the reputation of constructed treatment wetlands in the Czech Republic.

The subject of the research is a ventilation unit with a heat pump providing vacuum ventilation in a specific family house. The year-round energy balance of the operation was prepared from the obtained parameters. For a total heat loss of 5 kW, the seasonal heating factor SPF of the entire system was evaluated at the level of 2.5.

Saving drinking and hot water without considering the context can jeopardize the hygienic parameters of the water and the function of the internal sewerage system. However, the investigation is necessary, and therefore the author states the risks and defines the limit beyond which the investigation is inappropriate without other measures.

Based on the yearly operation of a specific device recovering heat from waste water discharged into the sewerage system for hot water preparation, the author documents the true potential of energy savings.

Underground and above-ground hydrants have a special position within shut-off valves. They are used for various functions in water networks. Their importance in relation to the applicable standards is also reflected in the fact that they have a higher minimum service life in the number of cycles (1000 cycles) than conventional shut-off valves with manual control. At present, the usual criterion for their purchase is the price, the criteria of construction and useful elements in terms of long-term durability and reliability are not taken into account.

One of the current strategies of the joint stock company Brněnské vodárny is the introduction of remote reading technology, which will fully incorporate cooperation with the city. A common approach to the development of the remote reading system is thus fulfilling a vision called Smart City. In this case, with the aim of covering all supply points in the city of Brno by remote reading of water consumption.

We present results of monitoring the occurrence of mixtures of unoriginal substances in groundwater of the Czech Republic. The results show that the introduction of new technologies for the removal of organic micro-pollutants will be necessary especially in the case of waterworks, where groundwater is a source for drinking water treatment.

Methods and instrumentation for injection quality measurement in heat pump boreholes including measurement of groundwater flow through the borehole outside the partly grouted borehole exchanger tubes have been developed in the Czech Republic. A Semtex charge has been developed for the rock massive repair, which reliably disconnects the ground exchanger tubes without serious impacts on the surrounding rock environment and buildings. The resulting hole can then be used for re-grouting, thus preventing undesirable vertical water flow through the borehole.

The aim of the paper is to present the possibilities of using water supply systems to mitigate the impacts of drought on the population. The paper includes a description of several specific cases in selected regions. The regions are Hradec Králové and Náchod areas, Central Bohemian Region and the closely related water supply to the city of Prague.

The risk assessment of water systems is implemented and carried out in more than ten European and a number of non-European countries. The main expected benefits of risk assessment are improving water quality, reducing the number and consequence of accidents, improving water resources protection, reducing acute diseases in the customer population, improving operational monitoring, better understanding of the entire supply system, reducing costs of remedies, operator and more. The disadvantage of carrying out a risk analysis for operators is, above all, a higher administrative burden and the costs of introducing a risk assessment.

The paper describes the possibilities of applying groundwater flow numerical model and the model of pollution spreading (transport model) in the process of determination or updating of water protection resources zones, resp. in determining the area of resources for human needs.

The model calculation of groundwater flow (based on a sufficient amount of input data) helps to set protection zones, address their area to the most necessary shapes and eliminate their under/oversizing.

By the hydraulic model are calculated groundwater levels and streamlines in the area of interest including groundwater flow travel times from the infiltration zones to the pumping wells. The detailed groundwater balance and the origin of the groundwater pumped in the wells are other useful model results.

The application of transport models contributes to the determination of the vulnerability of water resources in terms of potential risk pollution spread from the critical areas in the hydrogeological basin. The pollution spread is significantly influenced by the groundwater flow direction and intensity. The contamination transport is also influenced by the other processes (dilution, sorption, chemical reactions, preferential flow) and the transport is different from the average groundwater flow velocity. The results of the transport models enable the design of the effective groundwater quality monitoring system.

The article describes the procedure and results of the hydraulic and transport model realized using the MODFLOW-USG program for area of the Nebanice water resources in the Cheb Basin.

What is the impact of new procedures in water treatment, especially its automation and aplication of czech standard ČSN ISO 27000 about cybersecurity. These procedures are illustrated by an example of reconstructed water treatment plant Lednice.

The article describes various ways of evaluation of protected water areas according to czech legislation. From projected procedure and its testing some recommendations are made.

The paper deals with the influence of climatic conditions on the efficiency of operation of air-water and ground-water heat pumps in domestic hot water preparation. Simulation analysis was performed for domestic hot water abstraction by a family of four in different climatic locations in Europe. It has been found that the efficiency of both types of heat pumps does not differ substantially. The surprising conclusion is that the considered ground-water heat pumps are slightly more efficient in hotter regions for hot water preparation, while air-water heat pumps are slightly more efficient in climatically mild and colder locations.

The paper presents an analysis of PV system usage without a battery storage to cover electricity consumption for single family house with 4 persons and heat pump as a heat source for heating and preparation of domestic hot water. The result of the analysis shows the importance of using a sufficiently short time step of load profiles for correct assessment of solar fraction of PV system. Simplifying chart for fast estimation of solar fraction in a given application (heat pump, user energy) has been developed.

The paper deals with simulation analysis of solar system for domestic hot water preparation for apartment building. The analysis shows the influence of climatic conditions on solar system gains. The aim is to verify whether the level of solar gains can be guaranteed in the Czech Republic's climatic conditions. In discussions over the efforts to guarantee the benefits of a designed and installed solar system, another question arises as to how the total solar radiation changes year-on-year and whether its annual fluctuations can be simply passed on to the solar system's profit.