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Excuse me, the formula of drainage method
Water level rise formula:

(1)V volume of irregular object =S bottom ×h liter.

=a×b×h rise

Note: the increase of H is (new high-old high) (new h- old H)

(2)V irregular object volume =V water volume after dropping -V water volume before dropping.

= new abh- old abh

Note: A is long, B is wide and C is high.