6.2.2.4 TIME SERIES CONSISTENCY
The same method and data sets should be used for estimating CH4 emissions from wastewater for each year. The
MCF for different treatment systems should not change from year to year, unless such a change is justifiable and
documented. If the share of wastewater treated in different treatment systems changes over the time period, the
reasons for these changes should be documented.
Sludge removal and CH4 recovery should be estimated consistently across years in the time series. Methane
recovery should be included only if there are sufficient facility-specific data. The quantity of recovered methane
should be subtracted from the methane produced as shown in Equation 6.1.
Because activity data are derived from population data, which is available for all countries and all years,
countries should be able to construct an entire time series for uncollected and collected wastewater. If data on the
share of uncollected wastewater treated onsite vs. untreated are missing for one or more years, the surrogate data
and extrapolation/interpolation splicing techniques described in Chapter 5, Time Series Consistency, of Volume
1, General Guidance and Reporting, can be used to estimate emissions. Emissions from wastewater typically do
not fluctuate significantly from year to year.
6.2.2.4 TIME SERIES CONSISTENCYThe same method and data sets should be used for estimating CH4 emissions from wastewater for each year. TheMCF for different treatment systems should not change from year to year, unless such a change is justifiable anddocumented. If the share of wastewater treated in different treatment systems changes over the time period, thereasons for these changes should be documented.Sludge removal and CH4 recovery should be estimated consistently across years in the time series. Methanerecovery should be included only if there are sufficient facility-specific data. The quantity of recovered methaneshould be subtracted from the methane produced as shown in Equation 6.1.Because activity data are derived from population data, which is available for all countries and all years,countries should be able to construct an entire time series for uncollected and collected wastewater. If data on theshare of uncollected wastewater treated onsite vs. untreated are missing for one or more years, the surrogate dataand extrapolation/interpolation splicing techniques described in Chapter 5, Time Series Consistency, of Volume1, General Guidance and Reporting, can be used to estimate emissions. Emissions from wastewater typically donot fluctuate significantly from year to year.
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