Erosive processes are the limitative vitality of water reservoirs in catchment areas. Considerable quantity of the delivered erosion products to rivers are deposited in artificial barrage reservoirs. Qualification of the silting volume of small retention reservoirs in time of their operation and indication of the proper methods of silting forecast is a particularly essential engineering question especially in relation of the realized programme of small retention. The measurements results of silting of twelve small retention reservoirs being in the river-basin of the Upper Vistula were introduced in this paper. The determined mean silting degree of studied reservoirs carries out from 0,06 % to 6,38 %. Detailed silting forecast of four chosen water reservoirs was presented, two situated on water-courses with hydrological control - reservoirs Krempna and Maziarnia, and two situated on water-courses not included hydrological observations. The aim of the paper is appraisal of the possibility of silting forecast of small retention reservoirs by help of Gončarov’s and Šamov’s empirical formulas and on the basis of the determined intensity of silting according to Schoklitsch’s and Piečinov’s formulas. The capacity- inflow ratios - α, capacity-watershed ratios – C/W of studied water reservoirs were marked. This coefficients made it possible to qualify ...
The article contains results of an investigation about nitrogen compounds in water of fish ponds fertilized with biologically treated municipal sewage. The object was fish ponds of “Komorowice” complex, which are located in north part of Bielsko-Biała city. Two ponds were chosen to investigation: Green and Stone, which are characterized with an individual inflow and outflow of water and dif-ferent technical parameters. Green pond is a shallow pond with an average depth about 1m, its surface about 4,2 ha, and a water capacity – 42 000 m3. Instead Stone pond is characterized with a smaller surface – 3,3 ha and is almost two times deeper then Green pond, its average depth about 1,7m, which gives water capacity 59 200 m3. Researches were conducted in vegetative season in 2007. In paper were qualify changes of total, ammonium, nitrite, nitrate and Kjeldahl nitrogen concentration. During of whole investigative season were ob-served lower against to biologically treated sewage values of analyzed nitrogen form in water outflow of ponds. During that time were observed that occurrence changes in concentration of analyzed nitrogen compounds in pond’s water were related with changes of its concentration in sewage, which fertilized ponds. Addi-tionally, were calculate basic statistical parameters ...
The article contains results of an investigation on contents of oxygen de-mand in fish ponds water fertilized with biologically treated municipal sewage. Additionally, during collection of water samples there were also analyzed water reaction and pond’s water temperature. Researches were carry on in vegetative season in 2006. The object of research was fish pods of Komorowice complex, which are located in North part of Bielsko-Biała. The chosen ponds: Green and Stone are characterized with individual inflow and outflow of water. The chose ponds are characterized with different technical parameters. Green pond is shallow one – its average depth is about 1 m, with area of 4,2 ha, which give water capacity of pond 42 000 m3. In turn Stone pond have smaller area – 3,3 ha, but is almost two times deeper then Green; its average depth is about 1,7 m which also give greater water capacity of pond: 59 200 m3. In paper were qualified changes of oxygen demand, temperature and water reaction in pond’s water. Additionally, were qualified basic statistical parameters of analyzed indi-cators: an average, minimum, maximum value, standard deviation and interval. Analyses made in ponds showed, that in 2006 vegetative season contents of oxygen demand ...
