fix: convert Huang irrigation depth to volume before aggregation#22
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koen-vg merged 1 commit intoJul 3, 2026
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The Huang withd_irr variable is an irrigation-withdrawal depth (mm/month), but the script treated it as km3 and only scaled by 1e9, never multiplying by grid-cell area. Coverage-weighted summing of a depth is meaningless and inflated the current_use water availability by ~2 orders of magnitude (global ~505,000 km3/yr vs the true ~2,300 km3/yr). Convert depth to volume per cell (mm -> m times latitude-dependent cell area) before aggregating.
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The Huang withd_irr variable is an irrigation-withdrawal depth (mm/month), but the script treated it as km3 and only scaled by 1e9, never multiplying by grid-cell area. Coverage-weighted summing of a depth is meaningless and inflated the current_use water availability by ~2 orders of magnitude (global ~505,000 km3/yr vs the true ~2,300 km3/yr). Convert depth to volume per cell (mm -> m times latitude-dependent cell area) before aggregating.