#Thread of maps on Palayamkottai, now part of #Tirunelveli

As a city,Palayamkottai has a recorded history for more than a thousand years. It reached its zenith during the British era & was called as "Oxford of South India"

My first thread in 2022 is a tribute to #ThoPa
Palaymkottai was located in KeelKalaKootram, a revenue division in the east side of Porunai river (now called Thamirabarani). The fort itself was positioned to protect the lush farmlands & was at the intersection of the farmlands & pastures which designed its socio-cultural setup
Before the 1700s, the city was largely confined within the fort walls. But it had began expanding outside afterwards. The fort was a largely rectangular shaped structure with a number of bastions and four gates in four directions.
Yes. You read it right.. The stream is named so because a lady dropped her child while taking bath after trying to take a jackfruit that was floating in the stream when it had flooded once.
The city's head/mother goddess is Aayirathamman (Goddess of one thousand) whose temple is at the intersection of the arterial roads. The earliest inscriptions about the city are in Gopalaswamy temple and are more than a 1000 years old
The city has sprawled well outside the fort and now palayamkottai is part of Tirunelveli which has a population of ~0.5 million.. Only parts of the once majestic fort - east gate and west gate are left over.
Efforts are taken by @Vish_speaks to renovate
thehindu.com/news/cities/Ma…
This is my attempt to spatialize and record the history of this city based on the book by Tho Paramasivan and Navaneetha Krishnan.

In the early 2000s, I thought of giving a proposal to ThoPa to bring my skills and the geographical dimension to his anthropology works.
I was supposed to meet him as he lived a few streets away. I postponed it every time & I never met! Few years ago, when I heard that he was not well, I began regretting my procrastination 😏
His first year death anniversary was conducted right next to my house attendedby @thiruja
Collaborations may or may not work out as they depend on lots of factors. But a conversation would have been fruitful for both the parties.

This year my resolution is that - "Never postpone/ignore a conversation". We will never know what kind of idea that would spark.
Additional info: In 1940, Kirubantha Variyar influenced the then Tirunelveli collector to ban the tradition of bull sacrifice that was done for Aayirathamman. My grandfather (Mother's uncle) who was incharge of the temple then wanted the tradition to continue.
Fearing a social unrest, the tradition was continued. And when my grandfather who was an influential man died in 1942, the tradition came to a halt. This (without names) has been recorded by Tho Pa..
Legacy of ThoPa is about documentation. The wholesome recording of rituals around Aayirathamman makes me realize now that it was no random festival but people (unknowingly) are commemorating & reenacting events where the city rallied against external foes (but in altered manner)

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More from @rajbhagatt

27 Dec 21
Time for another short story

A small river/stream existed near Angul #Odisha. The land around it was allotted to JSPL for development...
The company thought the course of the river was too disturbing and decided to change the course of the river.
However there were other smaller streams that were draining into it (obviously) & since the new course didnt account it, they started stagnating (marked in white circle)
No matter how much they filled the land, it continued stagnating and creating issues for authorities and farmers nearby.
Read 5 tweets
5 Dec 21
Short thread of satellite images
Story of a navigational canal that was built with ~12 crore rupees tax payer money in #Ganga riverbed in #Varanasi Uttar Pradesh.

h/t @Indian_Rivers

Before the construction of the canal, this was the river Ganga
1/n
In March 2021, the construction started in the river bed where we can see the machines in action. The canal was supposed to be built parallel to the main river but within the bed.

2/n
By May, the construction had progressed and we can see the canal taking a shape (highlighted in white)

3/n
Read 9 tweets
7 Nov 21
#Thread
Many parts of #Chennai have been inundated after heavy rains (22 cm) last night. The city like all other in India faces a wide range of issues and it is UNLIKELY to solve any of the urban flooding related problems that it faces within the next 10 years.
Here's why
1/n Image
Chennai Metropolitan region (in particular the city corporation) is relatively flat terrain and is very close to sea level. The agricultural activity in the region had prompted construction of thousands of lakes which were shallow and large in area Image
Over the years, the city expanded and in many places (like South Chennai marked here) expanded in low lying areas (and wetlands) which are extremely close to sea level and water would tend to stagnate
Map shows builtup expansion Image
Read 14 tweets
24 Oct 21
Thread #Haldwani case:
After extreme rainfall in #Uttarakhand, a bridge failed across Gaula river near Haldwani

Rain wasn't sole cause, it just brought d collapse a bit earlier

Himalayan rivers exit mountains & enter plains with great intensity & it is a critical zone
It is in this critical section is Haldwani where the Gaula river exits the himalayas and enters plains. Rivers bring huge amount of sediments with them to settle as well as they have high intensity flows during monsoon to erode

Visual shows the location of the bridge that failed
Failure of a bridge is nothing new in the region. The previous bridge across the Gaula river (shown with old satellite image below) had collapsed in 2008 after floods
Read 17 tweets
16 Oct 21
#Thread - #Bengaluru Airport:
What exactly happened in Bengaluru airport that led to the flooding/stagnation a few days before?
My version:

Before the airport, area (marked in white) was in a ridge between 2 valleys, had cropland, quarries, a minor valey, open scrubland
1/n
Even after the completion of phase I which was the runway in the northern side and the terminal, the minor valley was not affected significantly as it was all limited to the northern side. One quarry site also remained holding stagnant water.
2/n
This map gives you the terrain of the airport area and one can easily notice the ridge on which it was built. Water was supposed to drain into the main valleys through the minor valley.
Approximate water flow directions are marked for better understanding of terrain
3/n
Read 8 tweets
18 Aug 21
Viz: #Kaveri river watershed 😍

I would be posting some #maps about the river with finer details in this thread in coming days! Bookmark.. Image
FAQ
Data: SRTM
Software: QGIS
One of the biggest engineering works in Kaveri river is the Kallanai / Grand Anicut system. It was not constructed in 1 step & most of the structure that we see were erected during British era

Annotated drone image from @vikatan. The subsequent tweets deal with history of dam Image
Read 19 tweets

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