Karachi has taken 295 mm of rain in two days, closing schools and leaving many areas without full power.
To grasp the scale of these torrential rains, we compare it with the capacity of Hub Dam.
Resultantly, the city was hit by water volumes close to what that reservoir can hold.
How Karachi’s 295 mm stacks up against Hub Dam
Think of 295 mm as about one foot of water falling on every patch of ground.
If rain of that depth spread evenly across Karachi’s urban footprint which is roughly around 3,500+ km².
It would add up to about 0.84 million acre-feet of water, almost the size of Hub Dam’s gross storage, 0.857 MAF.
In simple words, two days of rain nearly equalled a full Hub Dam.
But that doesn’t mean a reservoir could be filled in two days.
Cities are mostly paved, so water rushes off streets and into low spots.
Drains choke, some water soaks into the ground, and a lot simply cannot be captured swiftly.
Most importantly, rain isn’t perfectly even because some neighbourhoods get hammered while others get less.
So why did Karachi is in floods?
Because such a short, intense burst overwhelms storm drains and power equipment.
When pumps stall and crews can’t reach faults through waterlogged roads, the city backs up fast.
What can help next time?
- Keep roof downpipes and street inlets clear before a forecasted spell.
- Where safe and permitted, use small storage tanks or recharge pits to catch a slice of roof runoff.
- Citywide, create wider storm-water corridors and temporary detention basins so big cloudbursts move safely and can be stored for non-drinking uses.
Bottom line
295 mm in 48 hours is an extraordinary load nearly a Hub Dam’s worth spread across Karachi.
It’s more than enough to swamp a paved megacity, but with smarter drainage and small, legal harvesting, the next deluge can be less confusion and more capture.
Previously on the Karachi floods: Heavy rains knock out 550 feeders in Karachi, city faces power crisis
