Update for November 25 - December 1
Notable changes on the Mekong in the last week.
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SPOTLIGHT
Mekong Floodpulse continues its retreat
The Mekong floodpulse continues its retreat as the basin transitions
from the wet season into the dry season. The current amount of seasonal
flooding (14,900 square kilometers) is above average for this time of
year. However, the floodpulse peaked one month later than the historical
norm this year, and therefore its retreat is about one month late. The
Mekong Delta in Vietnam tends to benefit from a late retreat because
freshwater is available for agricultural purposes longer into the dry
season.
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Where is the water?
At the end of the wet season, we typically observe a mix of releases and
restrictions from dams throughout the Mekong. Restrictions were
observed at seven dams with the largest at Nuozhadu (PRC, 168 million
cubic meters) and Lower Sesan 2 (CAM, 136 million cubic meters).
Releases were observed at fourteen dams with no large releases observed.
This resulted in a small net restriction of 193 million cubic meters.
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Most Impactful Dams
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River Levels
River levels throughout the basin are generally near normal. Eyes on
Earth estimates that 28% of flow is missing at Chiang Saen, Thailand, as
a result of upstream dam restrictions.
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Chiang Saen Gauge
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Stung Treng Gauge
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Weather & Wetness
The upper basin continued to be extremely wet, creating higher than
normal river flow from the Mekong headwaters in China. The lower basin
was unusually warm with near normal wetness across most of the region.
Most of Cambodia and Vietnam’s delta had above average wetness.
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