A forecast of silting was developed for a small water reservoir on a watercourse not included in hydrological observations. Lack of data on the flow volumes, sediment concentration and suspended load transport suggest the use of indirect methods. These make possible determining the amount of sediment amount supplied to the reservoir. Studies on silting volume covered a reservoir at Narożniki situated on the Dęba stream. The methods of Reniger-Dębski, Brański and DR-USLE method were used in computations of sediment supply to the reservoir at Narożniki. Field studies were conducted to determine the way of management of the studied reservoir catchment. The kind of ground and its composition in the agriculturally used areas and forest sites were determined. The results of field works made possible to fix the parameters of the universal soil loss equation, which is the basis for computations using DR-USLE method. The silting degree computed on the basis of the reservoir silting measurements is 0.58%. The reservoir silting in successive years of its operation was calculated using Gončarov formula. The results of silting forecast after four years of operation were compared with the results of measurements. The highest compatibility of results for silting forecast developed on the basis ...
Within the framework of the small retention program location of 65 reservoirs and 4 polders was determined. Their total capacity will permit retention of 38 hm2 water and the estimated cost of building was about 1,03 mld złote [„Program małej retencji…” 2004]. Small water reservoirs undergo quick silting and the time laps of their silting is hazard to define. The paper presents possibilities of forecasting of small water reservoirs silting basing upon data gained from measurements of silting quantity from years 1969–1983 and 1999–2006. Two reservoirs at Zesławice i.e. the main reservoir before and after desiltation and the sidereservoir which was passed over for exploitation after desiltation of the main reservoir. The paper aims at determination of the influence of the side-reservoir on silting intensity decrease in the main reservoir. The time laps after which the reservoirs will be silted in 80% was calculated. Forecasting of water reservoir silting was made according to Gončarov’s formula. Determination of the quantity of load deposition after the first years of exploitation - R1 cause of principal difficulties in elaboration of forecasts. Disposing of measurements of silting quantities in consequent years this quantity was calculated after transformation of the equation to the form permitting ...
Small water reservoirs are silted in the considerably shorter time in the comparison with average and large reservoirs. Considering the silting process de-silting work every dozen or years are carried out. Desilting of small water reser-voirs follows after the lapse of the considerably shorter time of operation than it to result can from the Hartung's criterion, according to whose reservoir not fulfils one's the function because of silting making up 80% of his origin capacity. The example is the reservoir in Krempna, which was desilted after eighteen years of operation, when his silting, determined for the help of the degree of silting, 41% carried out. The redevelopments of the reservoir were also executed during of de-silting works in 2006, reducing his capacity from 112 thousands m3 to 96,3 thou-sands m3. Execute the silting measurements in 2009 and stated that the degree ratio is equal 7,0 %. It was worked out the relationship between silting ratio and the time operation of the water reservoir in Krempna, definite on the basis established silting ratios of the reservoir in individual years before and after desilting. On the basis of this relationship was stated that the course of the silting process will take place ...
