Three Gorges Dam - Outflow Data somewhat peculiar

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hello intelligent people, /pol/etarian here.

as you may our may not know, there's a general going on centered around china's three gorges dam and this year's flood season.

The dam itself is currently undergoing the largest strain since it's completion.

to my actual question:
>pic related
what explanations could there be for the outflow to be behaving like it is?


source is 3gd.mooo.com, which is a visualization of data scraped from http://www.cjh.com.cn/swyb_sssq.html

i have quite a bit of additional info if you're interested.

thanks in advance for taking a look!