Raj Bhagat P #Mapper4Life Profile picture
May 10 6 tweets 3 min read Twitter logo Read on Twitter
#Thread

Another city, another neighbourhood, another stream but same story

This is about a nala that flows through the dense urban concrete jungle of #Hyderabad city. It flows through Padma colony of nallakunta neighbourhood and eventually joined Musi river. Image
Like many streams and canals in urban environment in India, this stream also didnt have any buffer in case of severe floods and jailed with concrete walls and no room for it to breathe. For most of the year, these streams carry sewage water. Image
In this Padma colony section, where the nala didnt have any space already was contained further by constructing a street on top of it. The canal now became a duct below a functioning street. Its capacity gets reduced and is a potential clogging nightmare. Image
Google Maps - Street view of that street below which the canal is now flowing is displayed below.

This means that any small amount of construction or maintenance work or clogging happens, there is no more space for water to run and it would start flooding other places Image
Few days ago, when it rained heavily, the water from the canal breached the retaining wall and began flowing outside into the streets of Padma Colony (flooded areas marked in red) . Residents blamed it on corporation. Corporation blamed it on encroachments. Image

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More from @rajbhagatt

Dec 25, 2022
#Thread on Local Football

WorldCup is over. Though football has lost media attention in India,local football is living& thriving even under difficult situations

As my club is gearing up to organize a tourney, I'm writing this to show d love & troubles, d game faces
@Udhaystalin Image
Contrary to perceptions & opinions, Football is quite popular in many places in India like my town (Nagercoil, Tamil Nadu). 300-500 people (mostly young) attend matches even when conducted during the peak of summer and during a working day. Photo taken during pre-match
2/n Image
Though the popularity is there, the game is strained because of lack of recognition in media channels, lack of finance, lack of good local examples, lack of organization, & the economic situation among the masses
3/n
Read 18 tweets
Oct 3, 2022
I am yet to write all my suggestions related to the climate action plan for Chennai which has been open for suggestions

But wanted to say this:
Please DON'T take all these sea level rise maps from the report that depends on climate central. These are INCORRECT.
@chennaicorp
What is wrong:
1. Elevation models used for these analyses are incorrect
2. climate changed induced sea level rise wouldn't act like a bath tub where water rises just like that
3. There would be formation of new beaches and erosion and would be different from current topography
4. We dont have a good estimate (as our models dont have sufficient data) to predict such change

As much as a false negative, a false positive is also a problem as it gives wrong projections of who would be affected. It gives wrong sense of priorities also.
Read 5 tweets
Oct 2, 2022
#Bihar
1) Throughout the entire south west monsoon season, Bihar and the catchments of the rivers that flow through it have been facing deficit rainfall. But.. Image
2) Throughout the entire season, Kosi river has been flowing above warning level for every day and above danger level almost every day!

Isnt it odd that a river basin that is facing deficit and drought like situation have flood too simultaneously? Image
3) The primary reason is Bihar's topography and our failed methods of attempting to control them. Bihar has an extremely flat terrain, that just 1.5 m rise in Kosi river can cause it to flood.. Image
Read 6 tweets
Aug 27, 2022
Short Story: 🧵

Near wonderla exit in #Bengaluru - Mysuru road, there existed a valley system (flow directions indicated below). Few irrigation tanks were also there in the valley (marked in blue).

1/n
The construction spree on top of the valley system started when the road was expanded along with a toll gate right on top of valley! And other builtup came along the highway too completely causing the valley system to be obstructed.

2/n
After heavy rain, the water couldn't move anywhere as there were no drainage alternatives. So it began stagnating and moving on top of the roads!

3/n
Read 7 tweets
Jul 2, 2022
Short #Thread:

Though heavy rainfall is the trigger, our construction practices of where and how are the biggest causes behind some of the most devastating landslides that are costing both lives and money for us.

1/n
Image shows a relatively well vegetated hill slope in #Manipur in 2009
2/n
When a railway line was built along the slope (alongwith many roads), lots of slope cutting, vegetation clearances took place in the region.

3/n
Read 10 tweets
Jun 11, 2022
Short #Story of a river, a sea, a fishing village, and a groyne

Satellite image from 2005 shows the delta of Porunai river (Thamirabarani) in Thoothukudi district of Tamil Nadu.

1/n Image
The river settled some amount of sand in the sea and close to the mouths the sea was shallower and with lots of sand.

2/n Image
A village (Punnaikayal) was dependent on this onfluence of the river and the sea but the fishing boats had difficulty in moving particularly during low tides

3/n Image
Read 10 tweets

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