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#Short Story/Thread :

In 2003, A stream/river (seasonal) was flowing in #Dehradun near Sahastradhara Road..

Satellite Image snapshot from Google Earth
1/4
Someone thought that it was wise to construct an IT Park right on top of the river..

Satellite image shows it now (Google Earth Snapshot)

2/4
In Google Maps, It's still marked as a waterbody "Nala Pani ki Rao"

3/4
People might have forgotten the river/stream But the stream definitely didnt forget where it had to flow.

In 2020 after a spell of monsoon rains, the stream overflowed and the IT Park flooded!

Video below shows what happened (first of the lot)

Please do read the entire thread. This is not an isolated incident and is not something done by one government official or a political party!
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Keep Current with Raj Bhagat P #Mapper4Life

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Raj Bhagat P #Mapper4Life
@rajbhagatt
Reposting some of the visuals here in this thread if anyone wants to see them in one place :)

Future posts would be added to this...

Read 22 tweets
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Raj Bhagat P #Mapper4Life
@rajbhagatt
#Thread:

Since many had asked this, Writing a short thread on the formation between India and Sri Lanka

Usually many get deceived by "static" satellite images and believe that the Tombolo section as permanent relics of a man made bridge.
Deeper ocean currents don't enter the section between Sri Lanka and India because of the Cont Shelf. The sea surface in this section is dominated by longshore currents in two directions - one from Gulf of Mannar and other from Palk strait and they are in opposite directions
Longshore currents bring a lot of sediments. And at the meeting point of the currents they settle and form these islands. Notice in the satellite images below how these islands change a lot owing to current direction, tides, etc. This is just a short term timelapse (<4 years)
Read 9 tweets
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Raj Bhagat P #Mapper4Life
@rajbhagatt
#Thread on Koshi and Bihar Floods:

Though there are articles on Koshi River n flooding in Bihar, I prepared this thread to visually explain it!

Image: Topography of #Bihar
Despite being far from sea most of Bihar people live at an elevation lesser than 100m similar to Kerala
R.Kosi is a tributary of Ganga. It's watershed covers Mt.Everest but at it's confluence with Ganges, the elevation is just 25 m above sea level. All this within an aerial distance of 300kms! Along with seasonal rainfall, this has led to massive erosion as well as deposition
Cross-sectional profile of the watershed shows this variation

After flowing in higher gradients cutting through the himalayas, Kosi river exits n meets flatter plains section with very less gradient. This leads to millions of tonnes of silt deposition in this section every year
Read 11 tweets

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