Should temporary water be allowed to drain from a flat roof?

Under a flat roof, there is a small sign of water, but this is very rare and has occurred only once so far, presumably after/due to heavy rain.

The possibility of thorough renovation is associated with a very long waiting time.

The visible spot apparently indicates where an accumulation forms in the roof, presumably the lowest point of the affected area.

Are there any experiences with the concept of temporarily letting the water drain at this spot (the puddle)?

Pictures?

Just because the water drips at point A below doesn't mean it necessarily comes in directly above point A.

A garden hose can help with the search.

Otherwise, the concept "removing standing water so it doesn't cause damage" makes sense. The exact implementation of this is then highly situation-dependent.

I would rather stretch a roofing membrane with a slope completely over the entire roof. It lasts a few weeks to months and is safer than just removing forming puddles. By the time a puddle forms, liters of water may have already seeped into the roof. What comes out at the bottom does not have to be everything; possibly the entire roof insulation inside is already soaked? And is quietly molding.

I would rather stretch a roofing membrane with a slope completely over the entire roof. It lasts a few weeks to months and is safer than just removing puddles as they form. By the time a puddle appears, liters of water may already have run into the roof. What comes out at the bottom may not be everything; possibly the entire roof insulation inside is already soaked? And is quietly molding.

I did not mean a puddle on the roof. But thank you very much.

Pictures?

Just because the water drips at point A below doesn’t mean it has to come in directly above point A.

A garden hose can help with the search.

Otherwise, the concept "remove standing water so that it doesn't cause damage" makes sense. The exact implementation of this is then highly dependent on the situation.

I didn’t mean a puddle on the roof. When I described it, I meant it could not be misunderstood. How is a garden hose supposed to help with the search? I don’t want to find the hole in the waterproof layer, and certainly not pour more water into the roof than is already there. The waterproof layer presumably has to be replaced anyway. Rather, I want to enable the roof, which is ventilated on the side, to dry out again over the hot summer and support this from below – now that I know where the puddle (the invisible one) IS inside the roof (not on the roof). Here, a garden hose could help. But thanks anyway.

I did not mean a puddle on the roof. When I described it, I meant it could not be misunderstood.

Well,

Currently, it is not even clear whether the flat roof is on a house, a carport/garage, or a terrace covering. Probably not a house, but that is just a guess.

Repairing (not necessarily completely replacing) the waterproof layer is the only thing that solves the problem. Everything else is just treating the symptoms. Ensuring that there is no stagnant moisture anywhere in the roof is probably sensible in any case.

And to be able to give advice, more information or meaningful pictures would be needed.