How do monsoon winds affect the water level of the Mekong River?

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Mekong River The Irrawaddy and Mekong river basins and their drainage networks.

The water level of the Mekong River is primarily driven by seasonal rainfall patterns dictated by monsoon winds.1

Wet Season: In May or June, the arrival of rain-bearing southerly monsoon winds causes the river's flow to increase significantly, particularly in the northern and eastern highlands. This leads to peak water levels occurring between August and October, depending on the river's reach.1
Dry Season: Beginning in November, the northeasterly monsoon wind brings dry weather to the region. This initiates a long dry period that lasts until May, during which the river's flow reaches its lowest point.1

Because the river's flow is so low during the dry season, its waters are essential for agricultural production, as rice cultivation would otherwise be impossible without irrigation.1