Abstract
The design of hydrotechnical constructions requires knowing certain hydrological quantities necessary for their dimensioning.
The annual average turbidity is one of these quantities. The issue is that, in some river sections direct observations and
measurements do not exist regarding this hydrological quantity, so that different empirical relationships developed by various
authors based on long observations and measurements are applied, such as that developed by Poliakov. Turbidity depends on
basin characteristics for the section considered. All coefficients that occurs in Poliakov's formula and which depend on the river
section characteristics can be extracted with high precision using GIS maps and plans. The use of GIS involves the determination,
in more accurate manner of the coefficients included in Poliakov’s formula. The values obtained from turbidity computation on
these lines must be balanced with some measurements made by competent authorities for the targeted sections to see if the values
obtained empirically fall within the values obtained by direct measurements. In this paper, calibration and verification of data
obtained by this method was made on Jijia River in computing section Victoria.