Why Is It Difficult to Identify Bodies Washed Away by the Bhote Koshi-Trishuli Floods?

On the sixth day following the Bhote Koshi-Trishuli floods, the recovery of bodies carried away by the river and accumulated in sediment continues, but only a few of these bodies have been identified, with officials stating that identifying the majority remains challenging.
According to data provided by the Ministry of Health, the percentage of bodies identified is just slightly over four percent.
What are the various reasons that make identifying the bodies of those missing in the flood difficult, even when their remains are found? Let us analyze this topic.