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Raj Bhagat P #Mapper4Life

@rajbhagatt

Nov 1, 2019 • 6 tweets • 6 min read • Read on X

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Short Thread - Not farmers but water management causes cropfires

Public Health Emergency declared in #Delhi due to #AirPollution

It's not just Delhi but many parts of #NorthIndia are affected by it as shown by Himawari Satellite

#DelhiAirQuality #DelhiChokes #DelhiPollution

Like always Air Pollution becomes a topic of discussion when Delhi is facing it during crop fire season and it's eventually forgotten. Interestingly people also search for #AirPurifiers when #AirPollution also trends as shown in Google Search Trends

Along with private transport, industrial (including construction), power plants, Crop fires also play an important role in Delhi's pollution spikes.

Animation shows crop fires in #Punjab, #Haryana this season (VIIRS Data)

But are farmers to blame?

Crop fires' root cause is with our water management and crop selection practices (which themselves go back to green revolution era). Ever since green revolution, we have been planting more and more water intensive crops all over India. Punjab, Haryana are no different.

@CopernicusEU

In order to prevent water depletion, government adjusted irrigation practices. This led farmers to plant these water intensive crops in quick succession. To clear the land, farmers are resorting to crop fires.

Satellite images from @CopernicusEU @sentinel_hub

@Flipkart

Hence to address the #cropfires issue, we have to address our irrigation and water management issues which have been plaguing our country in different forms.

Companies like @Flipkart , @amazonIN @amazon can procure the stubble for packaging and reduce the burden a bit too.

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Raj Bhagat P #Mapper4Life

@rajbhagatt

Oct 15

#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

@rajbhagatt

Oct 2

#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)

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.

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

Read 26 tweets

Raj Bhagat P #Mapper4Life

@rajbhagatt

Aug 24

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

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.

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.

Read 15 tweets

Raj Bhagat P #Mapper4Life

@rajbhagatt

Aug 16

#Thread
#Marina beach is one of the most iconic destinations in Chennai and one of the most visited beaches in the world. However the beach as we see today didn't exist a century ago.

This thread explains the formation of #Chennai's Marina beach
1/n

This map below shows the approximate original coastline of Chennai during British era. It was much closer to the Kamarajar road. A promenade was developed during the british era and that is when it got the name, "Marina". However the big sandy expanse itself didnt exist
2/n

Seas are very dynamic in nature. Whenever the waves hit the beach which is called as "swash", they bring in sand and when the water goes back ("backwash"), it removes the sand. This balance is critical for beach existence.

Read 24 tweets

Raj Bhagat P #Mapper4Life

@rajbhagatt

Jul 30

#Thread of #Maps that can help understand the #WayanadLandslide incident, its causes & impact

Please note that all the maps below were created with the information available as of now. Some of the damages outside the areas denoted might have been missed as info keeps coming

1. This part of #Wayanad is within the Chaliyar river system. It is a west flowing river which drains into the laccadive sea on Kerala coast (though at this part it is north and east flowing)

This map shows where the water drains. The area that is affected is shown in red.

2. In this particular section, the stream arises at around 2000 metres above mean sea level and has a steep fall of around 1200 m to reach Vellarmala, Chooralmala section.

Read 8 tweets

Raj Bhagat P #Mapper4Life

@rajbhagatt

Jun 1

#Thread
A collection of geographical myths & unknown facts about #Kanyakumari

1. Kanniyakumari is NOT the southern most point of mainland India, the southern most point is near star of the sea rock in nearby #Kovalam. In the last 20 years,it has been popularized as sunset point

2. Contrary to popular opinion, the three seas (Arabic Sea, Bay of Bengal, Indian Ocean) don't meet in Kanniyakumari.

Officially, the sea around Kanniyakumari district is Laccadive sea. Check map below for official extents of the seas and their names

3. Before 1956, Kanniyakumari was part of Travancore which pre-independence was a separate princely state. The South Travancore lines (a series of fortifications) were built to protect #Travancore. Currently, a small amount of this fortification is visible near Kanniyakumari

Read 7 tweets

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