KATHMANDU, June 23 -- Sambhu Kumar Mandal is from Sitamarhi in Bihar. Like hundreds of other migrant workers from India, they have been in Nepal working in reconstruction jobs after the 2015 earthquakes.

What they did not realise is that the district most affected by those earthquakes would be ravaged by yet another disaster six years later - the deadly flash floods on 14-15 June.

Mandal and dozens of other carpenters, plumbers and painters had been working in Sindhupalchok, hired by people rebuilding homes that had been destroyed in 2015. One week after the massive flood. Some of those same houses they helped rebuild are buried up to the second floor in sediment.

Ironically, Indian migrant workers have filled jobs left vacant by youn...