Além do dano, houve uma inundação.

Because de + o contracts to do in Portuguese.

So:

• além de = beyond / besides / in addition to
• o dano = the damage
• além do dano = in addition to the damage

This kind of contraction is very common:

• de + a = da
• de + os = dos
• de + as = das

So you would also get:

• além da perda
• além dos problemas
• além das despesas

Here, além de means in addition to or besides.

It introduces an extra element on top of something already mentioned. In this sentence, the idea is that there was already damage, and on top of that, there was also a flood.

So the structure is:

• além de + noun = besides / in addition to + noun

Examples:

• Além do atraso, houve confusão.
• Além da chuva, houve vento forte.

Houve is the past tense of haver used in its impersonal sense, meaning there was or there were.

So:

• há = there is / there are
• houve = there was / there were
• haverá = there will be

In your sentence:

• houve uma inundação = there was a flood

This use of haver is very common in formal and neutral Portuguese, including European Portuguese.

No. In this use, haver is impersonal, so it stays in the 3rd person singular.

That means it does not agree with what comes after it.

So Portuguese says:

• Houve uma inundação.
• Houve problemas.
• Houve muitos acidentes.

Even when the following noun is plural, haver stays singular in this meaning.

This is an important rule:

• correct: Houve problemas.
• not standard: Houveram problemas.

In European Portuguese, houve is the better and more standard choice here.

Using ter in the sense of there was / there were is common in some varieties, especially in informal Brazilian Portuguese, but it is not the usual standard choice in Portugal.

So for European Portuguese, prefer:

• Houve uma inundação.

rather than:

• Teve uma inundação.

Uma is the indefinite article, meaning a / an.

So:

• uma inundação = a flood

It shows that this is being presented as an event or occurrence. Without the article, the sentence would sound less natural in this context.

Compare:

• Houve uma inundação. = There was a flood.
• Houve inundação. = There was flooding.

Both are possible, but they are slightly different:

• uma inundação points to a specific event
• inundação is more general or abstract

Both can be possible, depending on what the speaker wants to emphasize.

• o dano can refer to the damage in a general or collective sense
• os danos would suggest the damages or the different instances/types of damage

In English, damage is usually uncountable, and Portuguese often works similarly in some contexts. So além do dano can sound perfectly natural.

But you may also hear:

• Além dos danos, houve uma inundação.

That version can sound more concrete, as if several damages or kinds of damage are being considered.

Yes. Inundação is a standard and very common word for flood.

A few related words are:

• inundação = flood
• cheia = flooding / high water / flood conditions
• encher = to fill
• inundar = to flood

Depending on context, Portuguese might use cheia as well, especially for river flooding, but inundação is a very safe general word.

Yes, but the original order is natural and clear.

Original:

• Além do dano, houve uma inundação.

You could also say:

• Houve uma inundação, além do dano.

But that version sounds a bit less neutral and may feel more like an afterthought.

The original structure is good because it sets up the idea of additional harm first, then gives the extra event.

Yes, but in many contexts they are close.

• além de is the most basic and common way to say besides / in addition to / beyond
• para além de can sound a bit more formal or emphatic, especially in European Portuguese

So:

• Além do dano, houve uma inundação. = simple and natural
• Para além do dano, houve uma inundação. = a bit more formal or stylistically heavier

In everyday learning, além de is the one to master first.

In European Portuguese, houve is pronounced approximately OH-vuh, but with a reduced final vowel.

A rough guide:

• h is silent
• ou sounds like oh
• v is normal
• final e is a weak, reduced sound in European Portuguese

So it is roughly:

• houve → OH-v(uh)

Not like English how-ve.

A rough pronunciation is:

• ee-noon-da-SOWN

A few helpful points:

• the stress falls on the last syllable: -ção
• ção is a very common ending in Portuguese
• the final sound is nasal

So inundação has a nasal ending, not a fully pronounced on like in English.

If you want a rough learner-friendly breakdown:

• i-nun-da-ÇÃO

with the stress strongly on ÇÃO.

It sounds neutral to slightly formal, mainly because of houve.

Why:

• houve is standard and widely used in writing, reports, news, and careful speech
• além do dano also has a slightly written or report-like tone

So the sentence would fit well in:

• news reports
• written descriptions
• formal narration
• neutral spoken explanation

It is not overly stiff, but it is definitely more polished than very casual speech.