Encyclopedia
Variation
Variation - fluctuation of a characteristic, variability of the characteristic's value (RD 52.24.564-96)
Source: "METHODICAL GUIDELINES. PROTECTION OF NATURE. HYDROSPHERE. ORGANIZATION AND OPERATION OF THE MONITORING SUBSYSTEM FOR ANTHROPIC EUTROPHICATION OF FRESHWATER ECOSYSTEMS. RD 52.24.620-2000"
(approved by Roshydromet on 22.11.2000)