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Difference between a "dam" and a "barrage dam:"
https://graconllc.com/difference-between-dam-and-barrage/

Difference between a "barage dam" and a "weir:"
https://graconllc.com/difference-between-weir-and-barrage/

Causes of failures of "weirs:"
https://www.aboutcivil.org/causes-of-failure-of-weir.html

Theories of Seepage and Design of Weirs and Barrages (PDF file):
https://civilpddc2013.weebly.com/uploads/2/2/5/5/22556782/11_-_theories_of_seepage_and_design_of_weirs_and_barrages.pdf

Hydraulic structures such as dams, wiers, barrages, head regulators, cross-drainage works, etc., may either be founded on an impervious solid rock foundation or on a pervious foundation. Whenever, such a structure is founded on a pervious foundation, it is subjected to seep of water beneath the structure, in addition to all other forces to which it will be subjected when founded on an impervious rock foundation . . . The water seeping below the body of the hydraulic structure, endangers the stability of the structure . . .

[Also contributing to failure: damages, cracks, fissures, caused in wartime; catastrophic -type failures occuring days, weeks, or months after forceful impacts.]

Classification of reported failures (excluding China & USSR)
http://www.hydrocoop.org/classification-of-reported-dams-failures/

Country	Number
China	23,000
United States	9,263
India	5,202
Japan	3,130

Table ref. (PDF file): "Study on the Dam & Reservoir, and Analysis of Dam Failures: A Data Base Approach"

“Difference between a “dam” and a “barrage dam”

Thank you for info.
I read Russia blocked some gates to build the dam to a record high. Also, Russia had placed explosives beneath the water. I will try to re-find source : can’t remember if video or article source... maybe, someone else has at their fingertips! LOL