general runoff coefficient

COMPARING OF THE VOLUME OF STORMWATER RUNOFF FROM TYPICAL RESIDENTIAL CATCHMENTS IN LARGEST CITIES, CALCULATED ACCORDING TO UKRAINIAN NORMATIVE DOCUMENTS

It was analyzed Ukrainian normative documents, regulating the procedure of calculating the average annual volume of stormwater runoff from urbanized areas. It was found the big differences as in the numerical values of the general (annual) runoff coefficient, so in the classification of the surface cover type. Methods 1 and 2 indicate the ranges of numerical values of the general runoff coefficient for different cover types, but don’t explain the criteria for selecting the precise values for performing calculations under certain conditions.