Dam levels in Tamil Nadu and across Tamil Nadu, the storage levels looks awesome

January 26, 2021
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Chennai Dams – All the lakes are at full level and even the newly built Thervoy Kandigai dam has reached full level. It is one of the best year for Chennai. The three big lakes (Puzhal, Chembarabakkam, Poondi) over flowed for 1st time since 2015. There will be no water problem for Chennai for next 1 year and water is being supplied to Chennai City at peak 830 mld per day. There is a quota from Krishna water left too.

One interesting stats with respect to Chennai lakes

1995 drought and at end of term at 1996 all lakes are filled up brim

2003-2004 drought and just at end of term at 2005 all lakes are filled up brim

2012-2014 less rains and just at end of term at 2015 all lakes are filled up to brim

2017-2019 massive drought and just at end of term at 2020 all lakes are filled up to brim

Mettur Dam – The biggest Dam in Tamil Nadu. Good storage in Mettur Dam for 3rd year in row. Lot of water has been released from Mettur for irrigation. Still it is 80% full in January.

Bhavanisagar Dam – The 2nd biggest dam in Tamil Nadu continues to have good storage than 80% storage for over 5 months now

Coimbatore Dams – Most of the Dams catchment areas get rains in South West Monsoon and even in December they have good storage than normal years. Parambikulam the biggest is close to full level for over 4 months now with about 90% storage.  Aliyar is also close to 95% full. Sholayar meanwhile is used for hydro electric power.

Nilgiris Dams – Nilgiris dam catchment areas gets rains mostly in South West Monsoon, so there is some fall in storage as the water is used for electricity generation.

Kanyakumari Dams –  The two big dams Pechiparai and Perunchani are still 94% and 81% full. The third biggest dam in Kanyakumari which is Kodayar is 100% full while Chittar I and II both are over 70% full.

Tirunelveli Dams – Both Papanasam and Manimuthar overflowed with historic rains in January and almost all dams are full. Even the vadakku pachayar which has very small catchment and remains at dead level is at 100% level.

Theni Dams – Periyar Dam after January rains got good inflows and is 70% full in January and this itself shows how good rains were meanwhile Vaigai is close to 100%. So overall great year for Madurai.

Tiruvannamalai Dams – Krishnagiri dam is full and water is letout. eventhough it is not a great year for upstream Sathanur has 76% water.

Overall across Tamil Nadu the dam levels are so great even in South West Monsoon Catchment area dams. That too in the end of January.

Whatever dam data, i could get data i have compiled it with minimum cut-off size at 400 mcft.

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Chennai heat wave to peak today & temp will come down from Tom. In interior areas hot days will continue

April 2, 2021

1. Four Reasons for heat wave

  1. Dry land winds from North West – The entire march easterlies were present and the temp in coastal areas were so good staying less 35.  With land breeze coming from North west the temperature started to increase from 30th March and is expected to peak today in coastal areas.
  2. Heat advected from hot areas of Cuddapah-Rayalseema-Anantapur belt – The winds from these areas will be advected to the coastal areas of Tamil Nadu and Nellore belt.
  3. Strong Offshore Winds –  strong offshore winds will delay the sea breeze coming into the coastal areas like chennai resulting in increased heating time and thereby increasing the temp.
  4. Harmless Depression near Andaman – This Depression will move towards Thailand-Burma border areas and fizzle out. But this circulation 2-3 days ago was the reason for easterlies to be absent, resulting in land breeze over Indian peninsula

Now if read the above 4 points and co-relate to the image, u will understand the reasons for the increase in Temperature.

2. High Winds at Pamban – Rameshwaram belt tonight also partly in Vedaranyam – Kodiakkarai region

3. How will be the coming week in Chennai and other parts of state.

For coastal areas like Chennai, Pondy, Cuddalore etc, today (friday) will be the peak from tomorrow the strong land breeze will be absent though it might not dip down directly to 35-36, the temp might fall to 37 C. Assume today we are seeing 41C tomorrow Chennai will see drop to 37 C. From monday  / tuesday the temp will drop to 35/36 C.

Interiors like Salem, Karur, Trichy, Madurai will all continue to sizzle at 40 C even in next week. For them either side its land breeze and week easterlies / less winds will make these area heat more with temp remaining around 40 C.

We can see how dry these winds resulting in humidity to dip to 25% at around 12 noon the lowest in this year.

4. How will temp be on voting day in Chennai on 6th April

Next week the land breeze will be absent. Compare this pic with the one in the 1st. You can understand why there is fall in Temperature in the coastal areas. You can also see the Depression gone and return of easterlies in Bay of Bengal.

5. Hottest places in India in last 2 days

Some of the places in Tamil Nadu figured in the Top 25 hottest places of country (only observatories considered.)

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Dam Levels in Tamil Nadu as on 05.12.2020 – Awesome year for most of the Dams

December 6, 2020

Mettur Dam – The biggest Dam in Tamil Nadu. Good storage in Mettur Dam for 3rd year in row. Lot of water has been released from Mettur for irrigation. Still it is 72% full in December. I would take it any year on December. Remember most of the catchment areas get rains in South West Monsoon.

Bhavanisagar Dam – The 2nd biggest dam in Tamil Nadu continues to have good storage than 75% storage for over 4 months now.

Coimbatore Dams – Most of the Dams catchment areas get rains in South West Monsoon and even in December they have good storage than normal years. The Top 3 dams Parambikulam, Sholayar and Aliyar are having good storage levels.  Parambikulam the biggest is close to full level for over 3 months now.

Nilgiris Dams – Nilgiris dam catchment areas gets rains mostly in South West Monsoon, so there is some fall in storage as the water is used for electricity generation.

Kanyakumari Dams – Burevi might have missed giving Kanyakumari rains, but the two big dams Pechiparai and Perunchani are still 86% and 77% full. The third biggest dam in Kanyakumari which is Kodayar is 93% full while Chittar I and II both are over 70% full. So inspite of bad North east monsoon so far, the storage in the dams are still very good.

Tirunelveli Dams – Good storage in Papanasam and Manimuthar and they get good rains in December too. So Tirunelveli is big dams are looking very good.

Theni Dams – Periyar Dam and Vaigai has 50% of water. Madurai has got good rains in this north east monsoon this season. Manalar is almost 80% full.

Tiruvannamalai Dams – Krishnagiri dam is full and water is letout. it is not a great year for upstream od Then Pennai, so Sathanur has less than 40% water.

Chennai Dams – What a dream year for Chennai lakes, from all three big lakes (Puzhal, Chembarabakkam, Poondi) water has been released with levels maintained for flood cushion. Veeranam lake too is receiving massive inflow and water is letout for flood cushion. We got more water since 2015. Hope you all remember the special post put up on October 11, that all lakes will be filled to brim this monsoon and this has happened with a month to go.

Note: Please dont ask for any other Dams, this is maximum dam levels, i could get hands on and the cut-off is 100 mcft or 0.10 tmc.

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