English Other International Org/Dev/Coop UNDP documentation on climate change

"A hypothetical example of the use of multicriteria analysis:

This illustration of MCA uses a hypothetical example a situation, which may typically exist in the wet season in Bangladesh. The steps normally taken in a MCA analysis are as follows:

1) Problem definition: Because of rising sea level, higher intensity of precipitation and increased run-off in upstream areas, rain and ***smelt water*** reaches Bangladesh in a shorter period than before and also drains less easily. Floods, as Bangladesh has been experiencing for a long time, are thus getting worse."

I've already asked this question in the English-Spanish forum, but I cannot reach a conclusion as to what is meant here.

The context is the Adaptation Policy Framework on Climate Change, from the United Nations Development Programme.

Someone suggested that there may be a comma missing between "smelt" and "water", so the meaning would be:

Because of:
1. rising sea level,
2. higher intensity of precipitation
3. increased run-off in upstream areas
4. rain
5. smelt

then:

water reaches Bangladesh in a shorter period than before and also drains less easily.

And, probably, "smelt" here refers to the fish.

My interpretation was that "rain and smelt water" is a compound, both "rain" and "smelt" modify "water".

And then the meaning of "smelt" here would be "a product of smelting or fusing" (1 : to melt or fuse (as ore) often with an accompanying chemical change usually to separate the metal).

But I have no idea if any of these two options make any sense.

Could anyone please help me get out of the hole I'm stuck in? :(

Thanks a lot!!