überschwemmen
to flood
To cover an area with a large amount of water, for example during high water or a flood.
Nach tagelangem Regen hat der Fluss die angrenzenden Felder überschwemmt.
After days of rain, the river flooded the adjacent fields.

to flood
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to flood
To cover an area with a large amount of water, for example during high water or a flood.
Nach tagelangem Regen hat der Fluss die angrenzenden Felder überschwemmt.
After days of rain, the river flooded the adjacent fields.

The verb 'überschwemmen' (to flood) is inseparable. The prefix 'über-' stays firmly attached to the verb in all sentence forms.
Das Hochwasser überschwemmte mehrere Dörfer.
The floodwater flooded several villages.
In the figurative meaning, 'überschwemmen' (to flood) is often used with an oversupply of things or information. Typical combinations are 'den Markt überschwemmen' (to flood the market), 'mit Anrufen überschwemmt werden' (to be flooded with calls), or 'das Netz mit Bildern überschwemmen' (to flood the internet with images).
Nach dem Aufruf wurde das Tierheim mit Spenden überschwemmt.
After the appeal, the animal shelter was flooded with donations.
Especially in the figurative meaning, the passive is often used to emphasize who or what is affected by the mass of things. The structure is: Someone/Something is flooded with something.
Ich werde jeden Tag mit unwichtigen E-Mails überschwemmt.
I am flooded with unimportant emails every day.
to bombard
'bombardieren' and 'überschwemmen' can both mean that a very large amount of something arrives all at once. 'bombardieren' is especially suitable when a person directly receives a lot of questions, messages, or calls. It sounds active and often somewhat unpleasant. 'überschwemmen' is used more when a place, a market, or an inbox becomes full of too many things or too much information. The word is broader and less directly aimed at one individual person.

Am Montag überschwemmten neue Anfragen das Büro.
On Monday, new inquiries flooded the office.
Nach der Präsentation bombardierten die Zuhörer Emma mit Fragen.
After the presentation, the audience bombarded Emma with questions.