The object of work is the presentation of changes in the residential housing state of the countryside in period 1990-2000, expressed with measures of housing situation and housing standards. The selected problems characterise qualitative transformations, simultaneously showing problems demanding special regard to formation of spatial order on rural areas.

The results of research on heat exchange between the hollowed fruit store and the ground and possibilities of adaptation of such objects for cold stores have been presented in this paper. Basis of results of field studies, boundary conditions have been established and three-dimensional, non-stationary heat flows through the partitions and the ground in surroundings of the chamber have been calculated, and after its adaptation for chamber in two alternatives: for existing value of heat resistance of partitions and after its insulating to R = 2,5 m²·K·W^-1.

The objective of the presented investigations made in Department of Forest Engineering of The Agricultural University of Poznań was to develop a mixture of bark, cement and sand which could be applied to constructing a biological-technical reinforcement of the slopes to stop the erosion process. It was assumed that prefabricated units having the contour of a regular hexagon with a hollow filled with humus and overgrown with grass plants are proper for reinforcing scarps with a meaningful gradient (industrial refuse storing sites, embankments and cuts, dunes etc.). The elements which are cheque - arranged make it possible to fill the empty spaces with humus and sow grass and no danger of washing out exists then. Reinforcement of this type provides stability of the slope till the moment the plant cover playing an important role is developed. It was assumed initially that the plant cover rooting in a segment would simultaneously grow through its walls and especially its bottom containing fertilizing granules. As a result, the process of deep slope rooting and slow decomposition of bark - cement - sand elements follows.

In the article authors characterized the slope coefficient of critical line of the scour below hydraulic structures. The slope of the scour hole is of importance for the stability of adjacent structures and bad protection. Most of the authors carried on study of scour below a spillway and sluice gate. The own and other authors model test results made of two-dimensional flow are presented. Some of the results from study are shown on figure 2 and 3.

Catchment lag time, defined as the elapsed time between the occurence of the centroids of efective rainfall and the direct runoff hydrograph, has been estimated for a small, lowland agricultural watershed of Gzówka river. The investigated watershed, with area of 39.3 km², is located near town Radom in the Centre of Poland. Mean value of lag time estimated from rainfall-runoff events was 13.9 h. Taking into account 10 empirical formulas for estimatig the watershed lag time, the best results has obtained from Nash equation (6) and Wackermann equation (12).

The paper presents the way in which the presence of fine sediment in bedload influences the unit dominant discharge value. The investigations were carried on seven streams chosen in Polish Carpathians: the Raba River and the Kamienica Stream, the Targaniczanka Stream and Łubinka stream (from the Skawa river catchment) and the Tarnawka stream, the Paleczka stream and the Stryszawka stream (from the Dunajec catchment). For some streams the bedload transport was calculated using Meyera-Petera i Millera formulae, for the Raba River and the Targaniczanka stream the radioisotope method of measurement bedload transport was used. To calculate the dominant discharge Wolman-Miller method was chosen.

In paper are presented general characteristics of one-dimension hydrodynamic model MIKE 11, which makes possible to estimate sediment transport in rivers at different boundary conditions, by using five formulas and by two procedures based on constant bottom level or his variability caused by erosion-accumulation processes. Model testing was executed by comparisons estimated results with results of bedload transport measurements, carried in Zagożdżonka River, on the research catchment area of Department of Hydraulic Engineering and Environment Recultivation, Warsaw Agricultural University. It was stated distinct differences between sedimentographs and total volumes of bedload transport measured and obtained from model. Simulations show large model sensitivity on established time interval of calculations and character of bottom level changes. Simulations results depend from used sediment transport formulas. The best results were obtained with one-hour time interval of calculation by using Smart-Jaeggi formula. In that case the estimated values determine from 76 to 89% of measured bedload transport.

The Engesser-Shanley modified theory of thin-walled axially crushed cylindrical rods is presented in the paper. The problems of critical loads in elasto-plastic states have been considered. The plasticity ratio of critical transverse section has been defined by value ?-angle, which to slenderness ratio of rod is related. The received theoretical results to the experience research effects of rods made of steel St 35 have been compared.