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Also open air sewers are still common in a lot of places, an Iranian American friend of mine claimed he almost fell into one as a kid.
Google translate from the mehr article suggests it's sewage, not just storm water.
> Siavash Mahmoudi pointed out that municipal open streams are built with the purpose of disposing of surface water and rainfall, and continued: Currently, these open streams are used as sewage disposal networks;
But it could be a bad translation.