REPORT ON THE SINKING OF MEDIGADDA BARRAGE PIERS. Barrage needs to be reconstructed and remaining barrages may also see same issue in near future.

[JackSeal]

“A six-member Committee led by Member (Disaster &Resilience), National Dam Safety Authority, was deputed from 23:d to 25th October 2023 to examine the reasons for the sinking of the piers of the Medigadda Barrage. The NDSA Committee held discussions with EnC (General), I& CAD Dept., Telangana on 23rdat Hyderabad, carried out an inspection of the Medigadda Barrage on 24th and held the final roundof discussions with various stakeholders viz. I&CAD Dept., L&T Infra Ltd., SDSO, etc., on the 25th of October at Hyderabad.

The Committee, based on the barrage site inspection, discussions held with the stakeholders and after examination of the documents made available by | &CAD Dept.,has submittedits report to the Chairman, NDSA. The broad findings of the Committee are as follows:

i) The Committee has sought a list of 20 data/inputs to examine the matter. Of these, data/inputs about only 11 items in the list have been submitted. In line with NDSA communication dated 27.10.2023, it is construed that the I&CAD Dept. has nothing tosubmit about instrumentation data,pre-monsoon &post monsoon inspection reports, completion reports, quality control reports, condition of gates and many other inputs sought in the list therein. Per the Dam Safety Act 2021, the 1& CAD Dept [dam owner] cannot deny the inputs sought by NDSA, if available, with them.

i) As per the Committee findings, piers had sunk due to a combination of issues involving planning, design,quality controland Operation and maintenance (0&M).

ii) As per the Committee, the primary reason for the failure is the settlement of the barrage raft. The piers, being monolith with it, have also settled, moved and cracked. This could occur due to several possible reasons, viz. piping, wherein transportation of foundation material has occurred; inadequate bearing capacity of foundation material [sand]; failure of upstream secant piles due to barrage load; etc.

 iv)
v) There appears to be construction deficiency due to a lack of stringent quality control during the construction of sub-surface contiguous secant piles and plinth connection between the raft and cut-offs. Gaps might have been created in the secant pile formation, making the barrier permeable, leading to piping and subsequent progressive failure.

There are deficiencies in the project planning &design as well. The Barrage has been designed as afloating structure but constructed as arigid structure. The contiguous secant pile type cut-offs adopted by the project authorities were taken up to rock both at upstream and downstream of the barrage. This has changed the structure behaviour from the designed. Taking the downstream cut-off up to the impermeable strata alters the uplift pressure due to blocking the sub-surface flow.

The construction methodology adopted for transverse cut-offs has imposed different conditions than what was assumed in the design. The alignment of the flared-out wall provided upstream of the barrage makes the barrage hydraulic deficient.

The dam owner is supposed to undertake sounding and probing in the apron area every year immediately after the monsoon to assess the scours and launching of aprons in the vicinity of structures. The non-launching portion should also be carefully examined, particularly downstream, to ensure the effectiveness of the inverted filter. The upstream floor should be inspected every year early in the fair weather season by probing and using underwater lamps. A careful inspection of joints is also to be carried out. The dam owners have not inspected or maintained the cement concrete blocks or launching aprons since the commissioning of the barrage in 2019-20. In this regard, this maintenance deficiency of the dam owners has progressively weakened the barrage, leading to its failure. This is a significant lapse on the operation and maintenance front.

NDSA has regularly asked the Telangana State Dam Safety Organisation to get done the pre and post-monsoon inspections to check for any unusual behaviour or signs of distress. But it appears that this has not been complied with. This is a significant omission, thus attracting provisions of section 41 (b) of chapter XoftheDam Safety Act 2021. There appear to be many areas where compliance with DSA 2021 provisions was found missing. This is a serious matter as the Barrage has a high
risk potential for life and the economy.

The distress condition developed in one block of the Medigadda barrage is adversely affecting the functionality of the barrage. The barrage under the present condition is rendered useless until fully rehabilitated.
vi)
vii)
vii)

 ix) The damaged block may have to be structurally restored to make it functional. Considering the commonalities, the likelihood of the failure of other blocks resulting in asimilar mode exists. This would warrant rehabilitating the whole barrage.

Filling the reservoir in the present condition would worsen the barrage's health and should not be resorted to.
The two barrages constructed upstream of Medigadda under the Kaleshwaram
Project, viz; Annaram and Sundilla barages, have similar designs andconstruction methodologies, making them prone to similar failure modes. 

Signs of boiling already exist downstream of Annaram Barrage, a precursor to failure. These barrages also should be examined urgently for signs of piping/ distress.
xi) The Telangana state may look into the issues raised in the Committee report andundertake measures toremedy the barrage. Adetailed investigation may be carried out to determine the failure's causes. NDSA may be informed of the outcome of such an investigation and the proposed rehabilitation process. Similar action may also be taken for the other two upstream barrages.
 

[lollilolli2020]

@hyperbole @Android_Halwa @reality @dalapathi @TOM_BHAYYA Please comment

[reality]

27 minutes ago, lollilolli2020 said:

@hyperbole @Android_Halwa @reality @dalapathi @TOM_BHAYYA Please comment

First let pinkies give langa drive, then will respond… sigguleni janmalu…

huge loss to Telangana public. 

[futureofandhra]

Just now, reality said:

First let pinkies give langa drive, then will respond… sigguleni janmalu…

huge loss to Telangana public. 

ilanti projects lo kooda quality meedha compromise antey brs needs to be defeated once to teach them lesson

chustuntey telugu politics lo ysr family taruvatha inni benifits dora family kottesindhi lucky people

 

[Dallas_c_how_dare]

4 minutes ago, reality said:

First let pinkies give langa drive, then will respond… sigguleni janmalu…

huge loss to Telangana public. 

Congress yeddi lanjalu ruling chesinappati nundi ade muchata.. arey okkasaranna political parties ni pakkana petti discuss cheyyaleraa? Eppudu choodu, topic ki avasaramunna lekunna edchudenaa?

[reality]

9 minutes ago, futureofandhra said:

ilanti projects lo kooda quality meedha compromise antey brs needs to be defeated once to teach them lesson

chustuntey telugu politics lo ysr family taruvatha inni benifits dora family kottesindhi lucky people

 

Yes… pothar edhavalu nashanami potharu… vadu king la feel avuthunnadu slaves ni chusukoni… but it doesn’t last long.

[Bendapudi_english]

30 minutes ago, reality said:

First let pinkies give langa drive, then will respond… sigguleni janmalu…

huge loss to Telangana public. 

[RaaoSaab]

1 hour ago, reality said:

First let pinkies give langa drive, then will respond… sigguleni janmalu…

huge loss to Telangana public. 

Idi telangana astitvam pina jarugutunna kutra ani krishank gadu already oodaragotting

[lollilolli2020]

1 hour ago, reality said:

First let pinkies give langa drive, then will respond… sigguleni janmalu…

huge loss to Telangana public. 

mari @hyperbole ni tag chestunna but anna answer ivvatledu. 
 

KCR menalludu in DB @dalapathi uncle kuda not responding

[Pahelwan2]

Abbo Abbo ivanni pattinchukuni dora ki negative anukunte porapate. He will win with bumper majority. Media la red handed dorikina lucha gadu pcc president cheskuntene janalu aathucare antunaru. Project fault unte malla L T thone kattistaru still maintenance period la ne undi project. So not a big deal for dora. Ee lekkana scamgress party lakshalaa kotlu scam chesina party asalu elections kuda contest chese right ledu. Picha lite public will not see it as a big issue. 

[reality]

27 minutes ago, RaaoSaab said:

Idi telangana astitvam pina jarugutunna kutra ani krishank gadu already oodaragotting

Oh…BJ gallu open 69 with pinkies gaa

[reality]

14 minutes ago, lollilolli2020 said:

mari @hyperbole ni tag chestunna but anna answer ivvatledu. 
 

KCR menalludu in DB @dalapathi uncle kuda not responding

akkada rational ga cover cheskovadaniki em ledhu… he may be preferring to not give an answer like typical slave… good on him.

[RaaoSaab]

3 minutes ago, reality said:

Oh…BJ gallu open 69 with pinkies gaa

Pina oka pinkie gadu chudu it's not a big deal antundu sudu...adi mana state gorrela paristiti

[ticket]

Contracter mana megha eddy e ga?  Polavaram kuda guide bund poindi...

E commission batch antha in the..

[Pahelwan2]

Pina oka eddi gadu edo vagutundu athulukuda pikalev results chusko kallu bairlu kammutai vadiki