Which as your expert source states happens whenever a dam is commissioned, as they fill the lake upstream of the dam.
Once filled a regulated amount is subsequently released downstream. As being currently observed due to the natural monsoon rain.
Other naturally occurring and allegedly "manageable" events should also be planned for.
One could argue that the two international groups,:
"China’s Lancang-Mekong Mechanism was China’s answer to development planning in lower Mekong countries, welcomed by the MRC when the organisation held its first leaders’ meeting in 2016. As recently as during the drought it December 2019, the MRC and LMC signed a memorandum of understanding on data and information exchange and basin-wide monitoring."
Mekong dams destroy Tonle Sap Lake |The Third Pole
allegedly already co-ordinating "river development", should join up to form a more seamless, "river development/flow operation management system".
That then raises the question:
Should the, single international river development/flow operation management group, answer to,
The Asian countries through which the rivers flow.
Whose requirements include decades long investment, social policies, environmental requirement .... ?
or
The Asian countries through which the rivers flow + foreign regimes.
Whose demands in addition include foreign "here today gone tomorrow" media driven environmental and political driven agreement acceptance and revocation demands?