Page 120 - CIWA Water Data Revolution Overview Report

• Consumed Water: A total of 392.8 km³/year is consumed within the basin,
comprising Rainfall AET, Incremental AET, and non-recoverable flows.

• Non-Consumed Water: 21.0 km³/year is water that exits the basin without being
utilized, which includes utilizable, non-utilizable, and reserved outflows.

• Depleted Water: Evapotranspiration accounts for 385.6 km³/year of permanently
lost water.

• Surface Outflow (Qswoutlet): Surface outflows from the basin will average 28.2
km³/year.

Time series plots of key water balance parameters of the basin under climate scenario from

2025 to 2050 highlights years such as 2030, 2034-2035, 2039 and 2041 as high precipitation

and total ET periods. These correspond to generally higher water availability periods also. On

the other hand, periods of low water availability correspond to years such as 2033,2038 and
2040 represented by the constriction and dip in the graphs.

600

500
Water Accounts (km3) 300
400

200

100

0
2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050

P Utilizable_outflow Total ET outflow

Figure 7: Inter- annual variability of water accounts in the Volta basin under climate change
scenarios (2025-2050).

3.11 The Incomati and Maputo River Basins

The Incomati River Basin located in Eastern Southern Africa is a transboundary basin shared

by 3 countries - Eswatini, Mozambique and South Africa - that are dependent on their natural

2
resources for their socio-economic development. The basin covers approximately 49,000 km
and is home to nearly 2.3 million people. Water plays a vital role in the livelihoods of people