Based on the GIS dataset it's mostly Wahs, Distis, and Nullehs. You need an actual high capacity canals and locks to mitigate the kind of flooding seen in over the past few days. But the law and order situation in that region is a bit erm, lacking, compared to Northern+Central Punjab where industrial level canals the Brits left behind appear to be maintained. A lot of these regions where the flooding happened are also former princely state areas, so there wasn't that much infrastructural investment.
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They reline the canals, but other than Taunsa barrage it feels like they haven’t put as much effort into new drainage/catchment. Sindh has firmly resisted new upstream dams due to salinity concerns among other things.
That makes sense. There really needs to be more investment in canal infrastructure in Northern Sindh and Southern Punjab. These kinds of floods were common in East Punjab/Himachal/Jammu back in the 70s and 80s (especially the 1988 flood [0]), but a lot of investment was put into meteorological forecasting, drainage, and disaster preparedness in the 90s and 2000s to try and mitigate something like that from happening again.