Floodwaters gushing through mountain villages, cities rendered into swamps, mourners gathered at fresh graves — as Pakistan's monsoon season once again delivers scenes of calamity, it also lays bare woeful preparedness.

Without better regulation of construction and sewer maintenance, the annual downpours that have left hundreds dead in recent months will continue to kill, experts say.

Even Prime Minister Shehbaz Sharif appeared to agree as he toured flood-stricken northwestern Khyber Pakhtunkhwa province last week, where landslides killed more than 450 people.