Summary:

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 intensely after the redevelopment of the water reservoir as before his redevelopment. It was confirmed the results of the silting forecast and was stated that the impact of the redevelopment of reservoir on the change of the conditions of silting is important, and the full life of the reservoir will be lengthened about above 20%.