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Raj Bhagat P #Mapper4Life Profile picture
@rajbhagatt
Aug 22, 2019 • 7 tweets • 2 min read • Read on X
Chennai's growth over the years seen through night lights

#MadrasDay Special

Happy Birthday Chennai!

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More from @rajbhagatt

Raj Bhagat P #Mapper4Life Profile picture
May 30
Short #Thread:
The only reason for many places to flood in India is because we forgot & ignored our own #geography!

Kerala has been facing heavy rainfall, as monsoon is very active leading to a lot of flood incidents

I would unpack one case which clearly explains the issue Image
Kerala is sandwiched between the Western Ghats and the sea. As a region with very heavy rainfall, the water has eroded the land and has created a lot of pathways. This created the ridge (upper land) and valley (pathways) system that we can clearly observe in the elevation map Image
In older satellite images, we can observe the same through direct visual interpretation. We can notice that the ridges are relatively less vegetated whereas the valleys are thick with vegetation (natural as well as agricultural). It is through these valleys the water flows Image
Read 11 tweets
Raj Bhagat P #Mapper4Life Profile picture
Feb 24
#Thread

What geographical features can we observe from the sky while on a flight from Thiruvananthapuram to Chennai? (approx path in map) Image
Equip yourselves with apps for more information from GPS.. Also notice the weaker signals from the satellites on the right side because I am sitting on the left side windows. Also preload maps in google maps so that you can identify features Image
Image
In Thiruvananthapuram, we can notice a large sediment plume on the coast. This is largely around the Trivandrum Titanium Ltd
Read 27 tweets
Raj Bhagat P #Mapper4Life Profile picture
Jan 11
#Thread on #Tiruchendur erosion

Of recently, we might have come across the news that a lot of erosion has happened right next to the famous Murugan temple in Tiruchendur. In this thread of maps, I would discuss the causes and possible solutions Image
Image
To provide context, this photo shows the area near the next to the temple which has eroded significantly and the beach used to extend further Image
#Satellite image shows the Tiruchendur coastline from last year in the month of January. The beach marked to the south of Murugan temple is the one facing erosion. Image
Read 20 tweets
Raj Bhagat P #Mapper4Life Profile picture
Oct 15, 2024
#Thread without Maps on #floods
If physical problems and solutions are known theoretically, then why are we not able to solve flooding situations in our cities whether it is Chennai or Bengaluru or Delhi?

There are 4 layers to the prob - Technical, Planning, Finance, Governance
Technical:
Our cities are not designed to take the rainfall that they face. The storm water drains are inadequate and the network is disconnected. Most of the drains are built in adhoc manner (if they are built). But why does this happen?
Cities don't have a storm water management plan. A plan that can comprehensively provide the technical details on the storm water network based on run off calculations, land etc is absent in most cases or poorly prepared in the remaining.
Why hasnt been it prepared?
Read 16 tweets
Raj Bhagat P #Mapper4Life Profile picture
Oct 2, 2024
#Thread on Vijaywada floods
In September this year, after a spell of heavy rain, Vijayawada was affected by severe floods. This thread would explore the geographical reasons behind it and what can be done from here.
(1/n) Image
2. #Map shows the profile of four major rivers in India. Vijayawada is in the lower section of Krishna river and close to where the river exits the plateau and enters the deltaic flat plains. Image
3. There are 3 basins in the region whose histories are intertwined. Vijayawada city is sitting on the Krishna and Kolleru systems. Though the Krishna river was also flooding, the city was actually flooded by Budameru Vagu, a seasonal river which is part of the Kolleru system Image
Read 26 tweets
Raj Bhagat P #Mapper4Life Profile picture
Aug 24, 2024
Google maps shows my GPS position to be well inside the sea in #Chennai Marina beach. But I was away from it. Why?

#Thread continuation of my previous one on Chennai #Marina beach
1/n
Image
Image
In the previous thread, I had explained how Marina beach is growing (sea becoming more and more land). Because of the longshore drift, lots of sand hence gets settled in the mouths of Cooum River. Image
To prevent further siltation in the mouth of the river, the government had built Groynes so that the capacity of the river doesn't get reduced. Image
Read 15 tweets

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