The annual discharge of polluted sewage into Russian water spase is 40% of its total volume. In the gas industry this discharge is qinte small as compared to other branchers of ekonomy (0,01%).
Organisation of hydroecological monitoring is one of the main tasks in this branch. A biological method of analysis-ater bioindication - has been tested for monitoring small riwvers. This method has been used all over the world because of its high degree of informativity and integrity. This method provides for a direct assessment of freshwater ecosystem in its natural state.
Water quality is evaluated by means of macroorganisms inhabiting natural space.
The level of pollution in the water flow sections subjected to technogenic impact is assessed in terms of hydrobiological analysis data with their further ranking according to water quality types.
The latter ones are defined according to the evaluation scale of indication taxons with the scale being adapted to the fauna of this of that climatic and geographic zone.
At least three sectors are to be tested: above the zone of the object impact (background sector), within the zone of intensive impact (hypergenesis) and at the outlet of the impact zone.
The method of biological indication has been used to give an assessment of the water ecosystem in the vicinity of gas transportation and storage objects.
It is found that technogenic influence is season-dependent and is clearly seen in spring and early in winter due to the surfase water drain carrying the components of bed waters recovered along with gas.
The method of bioindication provides for specifying the boundaries of technogenic impact on the water object, i.e. it can define its locality, and measures may be taken on recovery of the water quality in this locality.