Thread by @rajbhagatt

Thread - India's flood plain issue:

There r so many flood incidents this year. One big problem s that we haven't mapped flood plains yet. Many crucial infra (road, railway) are built in flood plains with less care

Kabini Flood simulation shown here

FYI @PrinSciAdvGoI
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In this case study, We would look at Nanjangud, a small town in the banks of #Kabini river in #Karnataka

Like #MahalaxmiExpress case, Kabini takes a sharp bend n a highway is present in flood plains

Map shows Kabini river's path near Nanjangud (flood sim. was done for this)
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In August this year, Kabini flooded. This satellite image shows the area that was flooded. Black indicates water

Most of the flooded areas were farms

But two sections of the flooded areas have highways n builtup area in them (marked in red)

Data @CopernicusEU @sentinel_hub
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Ground reports from these affected areas show footage from these places.
These article describes them from ground
|
starofmysore.com/nanjangud-floo…

thenewsminute.com/article/over-1…

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Since the roads in these flood plains are ill designed w.r.t flooding, it was blocked for transport as shown in @googleearth maps

Roads across India often act as water barriers n lack enough culverts to transport water between land tracts aggrevating situations

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Summary: The case highlighted here is not an isolated case. The problem is that infra developers and planners across country aren't aware of flood plain extents and hence we're having lots of builtup in such critical areas.

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Soln:
We should create #NationalFloodPlainAtlas for India. This flood prob map should be used by planners, developers to avoid constructing(or prepared for) in critical areas. Insurers n fin inst can use them to avoid funding risky ones

Read n RT

@PrinSciAdvGoI @PrinSciAdvOff

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