In a regional water management assessment of the semi-arid Guadalquivir river basin, the annual renewable water supply is calculated as 3.2 × 109 m3. The annual water demands for the region are: agricultural irrigation (2.8 × 109 m3), domestic consumption (0.5 × 109 m3), and industrial use (0.3 × 109 m3). Based on these water budget figures, which option correctly identifies the water resource status of the basin?
A water deficit of 4.0×108 m34.0 \times 10^8\text{ m}^34.0×108 m3, because the total demand from all sectors exceeds the available renewable supply.
A water surplus of 4.0×108 m34.0 \times 10^8\text{ m}^34.0×108 m3, because the renewable supply is greater than the water demand for agricultural irrigation.
A water deficit of 8.0×108 m38.0 \times 10^8\text{ m}^38.0×108 m3, because the combined domestic and industrial demand represents the unmet portion of the budget.
A water surplus of 2.4×109 m32.4 \times 10^9\text{ m}^32.4×109 m3, because the renewable supply exceeds the non-agricultural demand (domestic and industrial).
