Page 51 - UKZN Proceedings of the Conference Report

Water footprint
Per capita water footprint
Per capita water footprint (PWFP) was calculated using the formula below to determine per capita water consumption: PWFP = WF / P,
Where PWFP is the per capita water footprint, WF is the water footprint and P is the population. The outcome of PWFP on the assessment period was as per the Table 4 below.
table 4: eLM per capita water footprint
year
2019 2020 2021 2022
Water import dependency
Water import dependency (WD) was calculated to determine the ratio of external water footprint (EWF) and WF, and it was determined using the following formula:
WD = (EWF / WF) x 100%,
Where WD represents water import dependency, EWF represents external water footprint, and WF represents the water footprint. Table 5 indicates the WD per annum.
table 5: eLM water import dependency
year
2019 2020 2021 2022
Water self-sufficiency
Water self-sufficiency (WSS) signified the ratio of internal water footprint (IWF) to WF and was calculated as per the following formula:
WSS = (IWF / WF) x 100%,
Where WSS represents water self-sufficiency, IWF represents internal water footprint, and WF represents water footprint. WSS was expressed as per Table 6 below.
table 6: eLM water self-sufficiency
year
2019 2020 2021 2022
Water footPrINt (Wf) (KL/aNNuM)
Population (P) (c)
PWfP (kl/annum/c)
43,573,035
328,774
133
56,981,208
395,228
144
37,787,759
409,377
92
42,926,807
421,740
102
Water footPrINt (Wf) (KL/aNNuM)
external water footprint (eWf) (kl/annum)
Water dependency (Wd) (%)
43,573,035
2,364,680
5%
56,981,208
5,385,812
9%
37,787,759
2,894,743
8%
42,926,807
8,801,683
21%
Water footPrINt (Wf) (KL/aNNuM)
Internal water footprint (IWf) (kl/annum)
Water self-sufficiency (WSS) (%)
43,573,035
41,208,355
95%
56,981,208
51,595,396
91%
37,787,759
34,893,016
92%
42,926,807
34,125,124
79%
Proceedings of the conference on Public innovation, develoPment and sustainability | 49