The factor I values in Equation 6.3 are based on expert judgment by the authors. It expresses the BOD from
industries and establishments (e.g., restaurants, butchers or grocery stores) that is co-discharged with domestic
wastewater. In some countries, information from industrial discharge permits may be available to improve I.
Otherwise, expert judgment is recommended. Total population statistics should be readily available from
national statistics agencies or international agencies (e.g., United Nations Statistics, see http://esa.un.org/unpp/).
Table 6.4 includes BOD default values for selected countries. It is good practice to select a BOD default value
from a nearby comparable country when country-specific data are not available. The degree of urbanization for a
country can be retrieved from various sources, (e.g., Global Environment Outlook, United Nations Environment
Programme and World Development Indicators, World Health Organization). The urban high-income and urbanlow
income fractions can be determined by expert judgment when statistical or other comparable information is
not available. Table 6.5 includes default values of Ui and Ti,j for selected countries.
The factor I values in Equation 6.3 are based on expert judgment by the authors. It expresses the BOD fromindustries and establishments (e.g., restaurants, butchers or grocery stores) that is co-discharged with domesticwastewater. In some countries, information from industrial discharge permits may be available to improve I.Otherwise, expert judgment is recommended. Total population statistics should be readily available fromnational statistics agencies or international agencies (e.g., United Nations Statistics, see http://esa.un.org/unpp/).Table 6.4 includes BOD default values for selected countries. It is good practice to select a BOD default valuefrom a nearby comparable country when country-specific data are not available. The degree of urbanization for acountry can be retrieved from various sources, (e.g., Global Environment Outlook, United Nations EnvironmentProgramme and World Development Indicators, World Health Organization). The urban high-income and urbanlowincome fractions can be determined by expert judgment when statistical or other comparable information isnot available. Table 6.5 includes default values of Ui and Ti,j for selected countries.
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