Dam operations calendar

Each row is a year and each column a month. The colour compares that month with the same month in other years of our record. ▲ means the water area rose (filling), ▼ means it fell (drawdown).

River MekongNile Reservoir Measure Water areaWater level

Well below normal (under 10th percentile)Normal rangeWell above normal (over 90th percentile)Not enough yearsLow confidence month