The results of sediment trap efficiency of the small water reservoir βin the following years of operation were introduced in this work. The qualification of the possibility of determination of the sediment trap efficiency of water reservoir at Zesławicach on the river Dłubnia using of the method Churchilla was the aim of this work. Sediment trap efficiency was qualified on the basis of several the measurements of silting in periods before and after desilting of reservoir and on the basis of calculations of the suspended sediment transport. The measurements of sediment volume deposited in water reservoir in Zesławicach were executed using the rod probe from the boat in cross-sections and the method of distracted points. The quantity of sediment delivered to the water reservoir in Zesławice was qualified the direct method, according to the IMGW instruction, and was calculated according to the DR-USLE method. The sediment trap efficiency reservoir at Zesławice in first year of operation in periods before and after desilting, definite on the basis of measurements of silting carries out 84.4 and 88.8% respectively. Churchill’s formula can be used to approximate qualification of the initial value βof water reservoir at Zesławice. The value of sediment trap efficiency reduced above three times in the period before desilting and above twice in the period after desilting. However silting trap efficiency definite according to the Churchill’s method will hardly reduce in comparable periods about 20 and 5%. Regression relationships in form β=  25.3ln(SI) – 359.1 and β= 56.4ln(SI) – 915.2 makes possible the qualification of the sediment trap efficiency of the reservoir at Zesławice in the several years of operation before and after desilting. Introduced by Churchill sedimentation index can be used to the study of dependence enabling delimitation of the sediment trap efficiency of small water reservoirs.

33-46