Så snart jeg opdager vandskaden, anmelder jeg den.

Så snart is a fixed conjunction meaning as soon as. It introduces a subordinate clause.

So in this sentence, så snart jeg opdager vandskaden means the event in that clause happens first, and the other action follows immediately after.

It is best to learn så snart as one unit, not as separate words.

Because så snart introduces a subordinate clause, and subordinate clauses in Danish normally have subject + finite verb order.

So:

• så snart jeg opdager vandskaden = correct
• så snart opdager jeg vandskaden = incorrect

This is different from main clauses, where Danish often uses verb-second word order.

This is a very common Danish word order pattern.

In a main clause, Danish usually puts the finite verb in second position. The whole first clause Så snart jeg opdager vandskaden counts as the first element of the sentence. That means the finite verb of the main clause must come next:

• Så snart jeg opdager vandskaden, anmelder jeg den.

Structure:

• first element: Så snart jeg opdager vandskaden
• second element: anmelder
• then subject: jeg
• then object: den

If you started with the main clause instead, you would say:

• Jeg anmelder den, så snart jeg opdager vandskaden.

Danish very often uses the present tense for future meaning when the context already makes the timing clear.

Here, the sequence is obvious:

1. I discover the damage.
2. Then I report it.

So Danish does not need a special future form here. Using the present sounds natural.

You could sometimes add vil for future meaning, but in this sentence it would usually sound less direct or less natural:

• Så snart jeg opdager vandskaden, vil jeg anmelde den.

That is possible, but the original sentence is simpler and more idiomatic.

Because Danish forms compound nouns very freely.

Vandskade is made from:

• vand = water
• skade = damage

So vandskade is literally water-damage, written as one word.

This is very normal in Danish. English often writes similar ideas as two words, but Danish usually combines them into one compound noun.

Because Danish usually shows definiteness by adding an ending to the noun.

So:

• en vandskade = a water damage / water-damage incident
• vandskaden = the water damage

The ending -en or -n often corresponds to English the.

So vandskaden already means the water damage, and no extra article is needed here.

In Danish, a simple definite noun usually takes the definite ending:

• vandskaden

Using den before the noun is usually for other structures, especially when there is an adjective:

• den alvorlige vandskade = the serious water damage

So in this sentence, with no adjective, vandskaden is the normal form.

Den refers back to vandskaden.

The noun vandskade is a common-gender noun:

• en vandskade

Common-gender nouns are referred to with den. If it were a neuter noun, Danish would use det instead.

So:

• vandskaden → den

Here den is the direct object of anmelder.

Anmelde usually means to report something in a formal or official way.

Depending on context, it can mean reporting something:

• to the police
• to an insurance company
• to some authority or official system

So this is not just casually telling someone about the damage. It suggests making a formal report or claim.

That makes anmelde a very natural verb with something like vandskade.

Yes, in normal written Danish you put a comma here to separate the subordinate clause from the main clause:

• Så snart jeg opdager vandskaden, anmelder jeg den.

The comma shows where the first clause ends and the main clause begins.

Yes. That is also correct and means essentially the same thing.

The difference is mainly sentence structure and emphasis:

• Så snart jeg opdager vandskaden, anmelder jeg den.
  This puts early focus on the timing.

• Jeg anmelder den, så snart jeg opdager vandskaden.
  This starts with the main action.

Both are natural.

Sometimes yes, but the meaning changes slightly.

• så snart = as soon as, with a strong sense of immediacy
• når = when or whenever, often more neutral

So:

• Så snart jeg opdager vandskaden, anmelder jeg den.
  = I report it immediately once I discover it.

• Når jeg opdager vandskaden, anmelder jeg den.
  = When I discover it, I report it.

The second version is possible, but så snart is better if you want to stress that the reporting happens right away.

It can overlap with all three, depending on context.

In this sentence, opdager most naturally means something like:

• notice
• discover
• become aware of

With physical damage like vandskade, it often suggests the moment you realize it is there.

So the exact English word can vary, but the Danish verb fits very naturally here.