Malin Landslide

One Day Workshop on Forensic Geotechnicall Engineering, E GNDEC, Ludhiana

Malin Landslide ide: A Case Stud

Mr. Shivaji M. Sarvade Mr. Pratik S. Khadatare (Fabtech Technical Campus, College of Engineering E & Research. Solapur, Maharashtra.)

"Engineering is a noble sport . . . but bu occasional blundering is a part of the game. Let it be your ambition to be the first one to discover and announce your blunders. . . . Once you begin to feel tempted to deny your blunders in the face of reasonable evidence evid you have ceased to be a good sport. You are already a crank or a grouch.” grou

~ Karl Terzaghi

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Introdu oduction • A massive landslide wiped out the village vil of Malin located at 110 KM from Pune city, in the Western Ghats on July Jul 30. • Mound of mud and debris that came down from a nearby hillock, swallowed up almost the entire tribal al village of around 50 families. • Final death toll was 153 when the rescue operation was stopped and around 100 people were missing 3

Introdu oduction

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GEOGRAPHICAL AL BACKGROUND • Malin village is a part of western ern ghat which is a UNESCO World Heritage Site and is one of the eight eig "hottest hotspots" of biological diversity in the world with average rainfall of 1171 mm. • Basalt is the predominant rock found fou in the hills reaching a thickness of 3 km. Other rock types found nd are granite gneiss, metamorphic gneisses etc. with detached occurr rrences of crystalline limestone, iron ore, dolerites and anorthosites. aon taluka which falls to the foothill of • Malin is southern part of Ambegaon Sahyadri Mountain range and is towards tow the west side of Pune city. 5

CULPR PRITS… • Very Heavy Rainfall. • Deforestation and Levelling Of Land and on the Hill for Cultivation. • Change in Agriculture Practice • Backwater of Dimbhe Dam. • Human Interference in Nature. 6

CULPR PRITS…

TRMM time series precipitation graph for the Malin in the last week of July

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CULPR PRITS… • Very Heavy Rainfall. • Deforestation and Levelling of Land nd on the Hill for Cultivation. • Change in Agriculture Practice • Backwater of Dimbhe Dam. • Human Interference in Nature. 8

CULPR PRITS… • Very Heavy Rainfall. and on the Hill for Cultivation. • Deforestation and Levelling Of Land • Change in Agriculture Practice • Backwater of Dimbhe Dam. • Human Interference in Nature. 9

CULPR PRITS… • Very Heavy Rainfall. and on the Hill for Cultivation. • Deforestation and Levelling Of Land • Change in Agriculture Practice • Backwater of Dimbhe Dam. • Human Interference in Nature. 10

CULPR PRITS…

Backwater of Dimbhe mbhe Dam. 11

CULPR PRITS… • Very Heavy Rainfall. and on the Hill for Cultivation. • Deforestation and Levelling Of Land • Change in Agriculture Practice • Backwater of Dimbhe Dam. • Human Interference in Nature. 12

MITIGA GATION • Land Assessment. • Slope Stabilization and Developmen ent. • Prepare Slope Stability Maps. • Prepare Landslide Inventory Datab abase. • Redirect Debris Channel. • Vegetation.

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MITIGA GATION • Land Assessment. • Slope Stabilization and Developmen ent. • Prepare Slope Stability Maps. • Prepare Landslide Inventory Datab abase. • Redirect Debris Channel. • Vegetation.

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MITIGA GATION

Slope S Stability 15

MITIGA GATION • Land Assessment. ent. • Slope Stabilization and Developmen • Prepare Slope Stability Maps. • Prepare Landslide Inventory Datab abase. • Redirect Debris Channel. • Vegetation.

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MITIGA GATION • Land Assessment. ent. • Slope Stabilization and Developmen • Prepare Slope Stability Maps. • Prepare Landslide Inventory Datab abase. • Redirect Debris Channel. • Vegetation.

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MITIGA GATION • Land Assessment. ent. • Slope Stabilization and Developmen • Prepare Slope Stability Maps. • Prepare Landslide Inventory Datab abase. • Redirect Debris Channel. • Vegetation.

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MITIGA GATION

Redirect Deb ebris Channel 19

MITIGA GATION • Land Assessment. ent. • Slope Stabilization and Developmen • Prepare Slope Stability Maps. • Prepare Landslide Inventory Datab abase. • Redirect Debris Channel. • Vegetation.

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MITIGA GATION

Vegetation tion on slopes

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PRECAUTIONAR ARY MEASURES • The natural drainage shouldn’t be disturbed d or blocked on the slope. • For support wall, wider base and slightly slig incline (towards hill) are to be provided. • Care should be taken for anything that t may move/fall downward. • Exposing a very high vertical face should sh be avoided. • Avoid adding load very close to the edge of the slope. 22

ALERT SYSTEMS SY • Efforts shall be taken to devise a program pr which can generate alerts for prospective landslides in the potent ential zones. • One such system is NASA-TRM RMM (Tropical Rainfall Measuring Mission).

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ALERT SYSTEMS SY

TRMM data for the Malin landslide, la sourced 30th July

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Concluding ing Remarks. • Landslides are common in the area rea during the monsoon season, which runs from June through September er. • Similar deforestation and environm onmental damage have caused floods and landslides in other parts of India ndia. • Last year, more than 6,000 people were killed as floods and landslides d the monsoon season. swept through Uttarakhand state during

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Concluding ing Remarks. • According to the information obtain ained under RTI, In Mumbai city over 22,483 hutment in 327 hilly areas across a 25 Assembly constituencies in the city, including Western and Eastern Ea suburbs, are dangerous and the people living there need to be shifted sh as soon as possible. • In the main city, 49 spots are dang angerous in which total hutments are 3986, while in Mumbai Suburb 278 78 spots are most dangerous. 26