About the case where water accumulates in the urn

When cremated remains are buried in a karot under a tombstone in a graveyard
1. Remain in an urn and be buried
2. Remove the bones from the urn and bury
Incidentally, in Sendai, where I live, the remains are taken out of the urn, transferred to sun-dried cloth bags, and buried in a carote.

At the time of the ossuary, the stone shop removes the lid of the tombstone, places the remains in the calot, puts the lid back on, and later closes the gap with cement or caulking agent. Even if you take care not to let rainwater get in like that, you won't be able to prevent gaps from occurring at all.

In most cemeteries, during construction work, a culvert is built under the carot to improve drainage. It is unlikely that water will accumulate in the callot due to normal rainfall. However, if a large amount of rain falls due to a typhoon or heavy rain, the wastewater cannot keep up and water accumulates in the callot.
In the case of a normal cemetery, I don't think it's possible not to get wet at all with rainwater. In the first place, humans are formed by generating, synthesizing, and fusing various elements under various conditions. In terms of Buddhist doctrine, it was created by temporarily merging the Big Four. Also, when the lifespan comes to an end, it is regarded as “the four major forces separate and go away.” I'm going back to the soil and back to the water. Therefore, it is natural law for rain to fall, so there is no need to hate getting wet in the rain. That's what I think. But it's not a bad thing if you think it's rude to wet your father's remains and try to take measures to do so. I think it's your own expression of affection.

I will be happy to answer any questions you want to know.
1. In the case of ceramic urns, can we think that most of them have accumulated water?

Answer: As a result of condensation, water accumulates.

2. If I bury my bones in my father's current urn, is there still a high possibility that water will accumulate?

I think there will be plenty of answers. If it's a porcelain pot, you'll be fine.

3. If I want to replace an “urn that doesn't accumulate water,” can I go at home?
Things to be careful about at that time, etc.

answer
As long as it doesn't cause trouble to other people, I think either at home or at the graveyard is fine.

4. Is there anything other than replacing bones in the first place?

answer
It is not a frequent occurrence, but remains are sometimes removed from graveyards for cemeteries rezoning or graveyard reburial. I think you don't need to worry about it.

Nice to meet you, my name is Akazawa from Ichimyoji Temple, and I'm a little off with your question, but I would like to share my opinion. I hope it will be helpful.

In the past, when people died, their bodies were placed in coffins, holes were dug in the ground, and buried.
However, even though my father is sleeping there, people I don't know and farm animals walk on it.

Therefore, a large stone was placed on the ground as a sign that a coffin was buried underground, which is the origin of graves.
As is the case with “remains,” the object of worship for us monks is the “commandment.”

Therefore, “Namu Myōhō Renge Kyō,” “Namu Amida Buddha,” or “Club Ichokoro” is engraved on the front of the tombstone.

At graves, it is important to express gratitude not only to the remains and ancestors, but also to Buddha and Amida Nyorai.
And our last job is to return the remains to the soil in their natural form as they should have been in a stone pagoda or sanctuary filled with that feeling.

From the above meaning, why don't you use an ossuary in an urn and wrap it in something that can be returned to the soil and ossued?
At Tsuji Temple, sutras are copied on 100% cotton cloth and handed over.

YOSHI-sama
My name is Tetsuya Urakami from Nagomi-an, thank you for your support.

As for your question, in terms of the number of people looking at the inside of graves in detail, I think there are overwhelmingly many stone shops, but from my experience and what I've heard, I often hear that water accumulates inside carots and urns.

It seems that it is condensation or seeps out when it rains heavily. In old graveyards, it seems that carots are sometimes filled with water, urns float, the lid opens, and the contents are scattered.

Perhaps the intention of YOSHI's question is that it is painful for the father's remains to be flooded.
“Bones are bones, so there's no problem even if they get waterlogged.”
“The one soaked in water is decomposed, making it easier to return to the soil.”
Apart from that logic, I think it's a matter of feelings, so I'd like to think about it after valuing that feeling.

Depending on the region, bones may be scattered on a karot from the beginning, or placed in a cloth bag or Japanese paper and stored in a carote. However, in Tokyo and Kanagawa, I think in most cases, urns are put in carote as is.

If it's a new graveyard, it's unlikely that the carote will be filled with water like the “old graveyard” described above. Therefore, I think it would be a good idea to transfer the father's bones to an “urn where water does not accumulate” so that water does not accumulate in the urn.

There is no particular problem even if you move it at home or with your family.
If you don't feel like it, you can ask a stone shop or monk.
I live in Yokohama (Kanagawa-ku), so I can help you if you have any problems.

Please discuss it with your family.

　The important things have already been described by the three teachers above, so I'll talk about another way to deal with it. I'm going to make a hole for drainage in the bottom of the current urn. Since it is made of pottery, it may be difficult to drill a hole without breaking it, but please think of it as a possible method.