The WFD tool build upon the UN-Habitat Waste Wise Cities Tool (WaCT), which is rooted in the SDG indicator 11.6.1 (MSW regularly collected with adequate final discharge). WaCT assessment method embeds use WFD (under its step 7). Both of these tools have been formulated parallely in a working partnership between UN-Habitat and GIZ, with support from Wasteaware, the University of Leeds and Eawag. The WFD model calculates three sub indicators of the SDG 11.6.1, therefore WFD users are able to directly input primary data collected during a WaCT assessment. Following are the three key data points from the WaCT (and SDG 11.6.1):
- Proportion of MSW collected – total MSW collected in the city, including both formal and informal collection services.
- Proportion of MSW managed in controlled facilities – total MSW that is managed in facilities with at least “BASIC” control level.
- Plastic leakage – total amount of generated plastic that is not managed and leaks from the MSWM system into the environment.
In difference with WFD approach, the SDG 11.6.1 methodology considers recovery facilities to be the last facility of the value chain processing the materials within the system boundaries of the case study. These could be recycling companies, exporting companies or facilities which conduct the very first stage of sorting. The WFD can still be used as a tool without having previously completed a WaCT assessment or without using SDG 11.6.1 indicator methodology. However, it will be necessary to input the key data from other sources. For further details on the two first sub-indicators please refer to the SDG 11.6.1 methodology. More information on the WaCT tool can be found on their website.
Besides SDG 11.6.1., WFD also shares links with SDG 12.5.1 (National recycling rate) and SDG 14.1 (Reduce marine pollution of all kinds, in particular from land-based activities). With regards to SDG 12.5.1, the WFD only considers the first stage sorting within the boundaries of the case study. Consequently, the amounts of MSW recovered for recycling cannot be determined according to the definition set by SDG 12.5.1. This indicator only considers a fraction of the amounts allocated for recovery, e.g. those intended for recycling. Furthermore, SDG 12.5.1 measures the national recycling rate whereas the WFD operates at the city or municipal level.
Whereas the WFD assessment of plastic leakage differs from the SDG 14.1 in that it looks at the source of plastic leakage within the MSW management system. This highlights where intervention is required within the system. Comparatively, SDG 14.1 assesses the presence of plastic in the environment, and when possible, it provides some information on the type of plastic polymer, the manufacturer and the country of origin. Both assessments provide valuable information and are complementary.