Morocco’s dam reserves slipped only slightly during a late May heat wave, with official figures showing stored water still above 12.9 billion cubic meters as the country heads toward the summer demand season.
Data from the Ministry of Equipment and Water showed the national dam filling rate at 75.83% on May 29, compared with 76.02% on May 20, when temperatures began rising sharply across several provinces.
The decline amounted to 0.19 percentage points over nine days, despite higher evaporation risks and increased water demand during the first major heat episode of the season.
In volume terms, stored water in major dams fell from 12.945 billion cubic meters on May 20 to 12.911 billion cubic meters on May 29, a loss of about 33.67 million cubic meters.
The level remains far above the same period last year, when national dam filling stood at 39.74% on May 29, 2025. The comparison reflects the effect of the 2025-2026 rainy season, which replenished reservoirs after years of severe drought.
The Sebou basin, Morocco’s largest surface water reserve, remained among the strongest performers, easing from 88.43% to 88.22% over the same period. Its stored volume stood at 4.737 billion cubic meters, supported by Al Wahda dam, which held 3.063 billion cubic meters at a filling rate of 88.73%.
The Loukkos basin fell from 91.91% to 91.08%, while the Bouregreg basin declined from 90.01% to 89.13%, amid pressure on drinking water supply along the Rabat-Casablanca coastal axis.
In the east, Moulouya remained at 72.94%. Tensift, which supplies Marrakech and surrounding areas, stood at 94.41%, while Souss-Massa remained lower at 54.18%.
Some basins still gained water during the heat spell. Oum Er-Rbia rose from 65.72% to 65.96%, helped by gains at Al Massira dam, while Draa-Oued Noun increased from 37.93% to 38.32%.
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