Únik vody je v kuchyni.

Because vody is the genitive singular of voda.

In únik vody, Czech is expressing something like a leak of water. After a noun like únik (leak / escape / outflow), Czech often uses the genitive to show what is leaking.

So:

• voda = water
• vody = of water

Literally, the phrase is closer to:

• únik vody = leak of water

This is very common in Czech noun combinations.

Únik is in the nominative singular.

It is the grammatical subject of the sentence:

• Únik vody = the water leak
• je = is
• v kuchyni = in the kitchen

So únik is the main noun, and vody depends on it.

Also, únik is a masculine inanimate noun.

Kuchyni is in the locative singular.

That is because the preposition v means in here, and when v expresses location, it takes the locative.

So:

• kuchyně = kitchen (dictionary form, nominative)
• v kuchyni = in the kitchen

This is a very common pattern:

• v domě = in the house
• v práci = at work
• v autě = in the car
• v kuchyni = in the kitchen

In standard Czech, you normally do use je in a sentence like this.

So:

• Únik vody je v kuchyni. = correct

Unlike Russian, Czech usually does not omit the present-tense form of to be in this kind of sentence.

You can omit words in some informal contexts, headlines, notes, or fragments, but as a normal full sentence, je should be there.

Czech word order is fairly flexible, so yes, it can change.

Your sentence:

• Únik vody je v kuchyni.

is correct and clear. But you could also say:

• V kuchyni je únik vody.

That version may sound a bit more natural in some situations, especially if you are first setting the scene: In the kitchen, there is a water leak.

Very roughly:

• Únik vody je v kuchyni. → focuses first on the leak
• V kuchyni je únik vody. → focuses first on the location

Both are grammatical.

Because Czech has no articles like English a/an/the.

So Czech simply says:

• únik vody
  not
• the water leak

Whether it means a water leak or the water leak depends on context.

That is normal in Czech. Learners often have to get used to the fact that definiteness is understood from the situation, word order, and context rather than from articles.

A rough pronunciation guide:

• Únik ≈ OO-neek
• vody ≈ VO-dih
• je ≈ yeh
• v = like English v
• kuchyni ≈ KOO-khih-nyi

A few useful points:

• Ú is a long vowel, so it is pronounced longer than a short u.
• ch in Czech is a single sound, like the ch in German Bach or Scottish loch, not like English ch in chair.
• y is not pronounced like English why. Here it is a short vowel, roughly like a short i, though Czech distinguishes i and y in spelling and sometimes subtly in pronunciation.
• ni in kuchyni is pronounced with a soft n before i.

Yes, it is understandable and grammatical.

It is somewhat formal or neutral in tone. You might see it in:

• reports
• maintenance language
• official notices
• technical descriptions

In everyday speech, people might also say things like:

• V kuchyni teče voda. = Water is leaking/running in the kitchen.
• V kuchyni někde uniká voda. = Water is leaking somewhere in the kitchen.
• Je v kuchyni únik vody. = There is a water leak in the kitchen.

So únik vody is perfectly fine, but it can sound a bit more formal than the most conversational phrasing.

Únik basically means escape, leak, or release, depending on context.

Examples:

• únik vody = water leak
• únik plynu = gas leak
• únik informací = information leak
• únik z vězení = escape from prison

So the core idea is that something is getting out when it should not.

Because the normal preposition here is just v.

Czech sometimes uses ve instead of v to make pronunciation easier, especially before certain consonant clusters. For example:

• ve škole = at school
• ve městě = in the city

But with kuchyni, plain v is natural and standard:

• v kuchyni

So you do not need ve here.

In this sentence, v clearly means in.

Depending on context, v can sometimes be translated more loosely as:

• in
• at
• sometimes even something like within

For place expressions:

• v kuchyni = in the kitchen
• v práci = at work
• v Praze = in Prague

So the exact English translation depends on what sounds natural in English, but the Czech preposition is the normal one for location.

Yes, that is actually a helpful beginner-level way to understand the structure.

A literal breakdown is:

• Únik = leak
• vody = of water
• je = is
• v kuchyni = in the kitchen

So, literally:

• Leak of water is in kitchen

That is not natural English, but it shows the Czech grammar well.

A more natural English version is:

• The water leak is in the kitchen.

It is singular.

Here is the basic contrast:

• kuchyně = kitchen / kitchens, depending on context and form
• v kuchyni = in the kitchen (locative singular)

Plural would look different, for example:

• v kuchyních = in the kitchens

So in your sentence, it is definitely one kitchen.

Probably these four things:

1. Cases matter

   • vody is genitive
   • kuchyni is locative

2. No articles

   • Czech does not say the

3. Prepositions control case

   • v
     • location → usually locative

4. Noun + genitive is very common

   • únik vody
   • sklenice vody = glass of water
   • láhev vína = bottle of wine

If you notice those patterns early, Czech sentences like this become much easier to read.