This paper describe the possibility to application the benchmarking for betterment the executing of maintenance works from the point of view the flora and fauna protection on water-course bed. Benchmarking used in the engineering and business gives in many cases profitable results. This method was don’t be used in executing works of water engineering and land reclamation. By the main-tenance work the essential problem is the effective protection of biocenosis on the water-course bed, because the conditions in work execution are changeable. Also the plant and animal community on the water-course bed, the slopes the coastal zone are changeable. The proecological activity consist in analysis of the ecolo-gical risk, properly time-limit to executive the maintenance-works, application of alternate technological schemes and machines suitable machine equipment. These activities can have a positive influence on ones kind of organisms and inadequate-ly on another organism. The evaluation of those activities is the changes of orga-nisms quantity as the consequence of executive works on water-courses. In this paper those consequence has been shoved on an example of six water-invertebrates Tubifex tubifex, Galba palustris, Gammarus pulex, Asellus aquati-cus, Limnophilus flavicornis and Ephemera vulgate. For three of them this – Tubi-fex tubifex, Galba palustris, and ...
