Sunday, November 30, 2008

Objectives of SaveTheHills

Objectives of STH

  1. To work towards prevention , mitigation and management of landslides hazards in the Darjeeling and Sikkim Himalayas.

  2. To develop and enhance public and govt awareness of the causes, effects of landslides through all means possible and thereby reduce disaster risk through hazard awareness.

  3. To conceive of and implement capacity building measures to the extent possible in order to make the community more resilient to landslide disasters.

  4. To monitor/report and visit landslide areas so as to create a database on landslides in the Darjeeling and Sikkim Himalayas (with the possible causes of landslides).

  5. To monitor rainfall through satellite based reports and other means so as to alert communities of the threat of possible landslides.

  6. To liaise with GSI and other scientific agencies during surveys so as to provide assistance and accurate local knowledge inputs.

  7. To network with other NGOs and govt agencies so as to increase knowledge about landslides and earthquakes.

  8. To participate in and organize workshops with a view to enhance disaster education about landslides and earthquakes.

  9. To participate in relief, rehabilitation and reconstruction work to the extent possible after landslides/earthquakes.

    praful rao

Saturday, November 29, 2008

"Landslides for dummies" by Dr Malay Mukul

We all know that the Himalaya has been formed by the collision of the Indian and the Eurasian plates and this process has been going on for the last 50 million years. The process of mountain building on our planet is accompanied by earthquakes and building of “topography” or relief resulting in formation of slopes. Once the slopes are built beyond a certain critical angle (that largely depends on how weak or strong the material or rocks/soils that make up the slope are) they strive to reach equilibrium by collapsing under the forces of gravity. This is essentially the landslide process that we encounter. Slopes can fail and slide at lower angles if the binding vegetation is removed or fluids get into the system. In an active mountain belt like the Himalaya, landslides are, therefore, an inherent product of mountain building where slopes are built to the point where they are no longer stable and then collapse to reach an equilibrium state. Landslides are, therefore, part of a natural process and we cannot stop or arrest this process no matter how hard we try. Our only option to avoid landslides completely is to move out of the hills and go to the plains. However, that is not a solution we seek at this juncture. So the next option we have is to try and understand the natural processes that lead to landslides so that we don’t facilitate them and develop an understanding of the risks involved in living on hill-slopes. To understand landslides an understanding of the geology of the region (preferably at the scale of our towns, villages etc.) should be the first order of business. While the detailed geology of the Darjeeling-Sikkim Himalaya is still in the process of being worked out, first-order features are more-or-less understood. First, there is almost a cake-like layering of rocks in Darjeeling-Sikkim Himalaya; the rocks are mechanically stronger as you climb up to the top of the cake. For example, rocks in the Teesta valley are weaker near the river than rocks higher up on mountain tops like Ghoom, Darjiling or even Delo. The Teesta has simply cut through this layering like a knife. Also, the layers in this cake are separated by particularly “weak” zones termed as faults which are basically large fractures which can be seen exposed on the surface but run deep underground. In these zones, the rocks have been crushed and powdered by natural processes and consequently they typically end up forming thick soils over the years. You cannot blast your way to solid rocks in fault zones. Needless to say, these are also zones that will slide easily and are difficult to stabilize. A typical example of this is the Birrik slide zone on NH-31A which has been active for decades now. A landslide in a fault zone is something which you cannot do much and the best strategy is to get the hell-out-of-the-way. Such zones have to be carefully identified and mapped at a scale of the habitat being planned. For example, in the Kalimpong area we have weaker rocks in the southern part of town and stronger rocks in the northern part of town (e. g. at Delo). So the fault zone separating the two layers of rocks must pass somewhere in between. This zone needs to be clearly identified and mapped in detail because this zone might hold the key to landslides around the Kalimpong area. This study is lacking at present. I fear that this zone might be heavily urbanized. While we cannot really do much to correct the presence of this geological zone, we can at least be careful to secure and stabilize it and keep out of this zone to the extent possible. Similar studies need to be carried out in the towns of Kurseong and Darjeeling and urban centres of Sikkim.

The bottom line is that as long as we live in the Himalaya, landslides will be part of our lives. We need to accept this and plan for it to the extent possible. Identification of geologically weak zones as well us having mitigation strategies in place would be the way to go. We cannot be thinking that all is well and adopt an ostrich mentality. We are not only vulnerable to landslides but also to large earthquakes and the worst case scenario would be a double whammy of both these hazards hitting us together. Great earthquakes cause multiple landslides as was evident in Kashmir during the recent earthquake. Unfortunately, we have chosen to ignore traditional wisdom and take backward steps in rapidly urbanizing our hills with concrete multi-storied dwellings. There will be a price to pay when the next big earthquake coupled with seismically induced landslides strikes the hills of Darjeeling and Sikkim. We know that for a fact from the Kashmir earthquake. The best we can do now is to minimize that price by acknowledging that we have a problem and taking remedial steps to the best of our ability.

Yes! We are living in a geologically precarious zone. We need to really map this zone in detail to begin with. Map the old and existing landslides closely next. Correlate the two and see what we get and have our mitigation strategies in place accordingly. That would be the strategy I would recommend. There are studies and reports on the entire Darjeeling-Sikkim area but that will not serve this purpose. We need very detailed work here specific to the urban area under consideration. It would also need to be done by a team of geologists, geographers and engineers who should be able to slant their specializations towards landslide hazard determination and mitigation. The work should be carried out in close consultation by social activists like you so that the deliverables can be directly used for policy making.

Personally, I think the best way to go about it would be to approach some Govt agency (like NDMA) for funding, get a team of motivated and qualified people together and start working on it ourselves rather than waiting for people to help us.


About Dr Malay Mukul

Dr Malay Mukul is perhaps the only scientist and geologist in CSIR Centre for Mathematical Modeling and Computer Simulation, at Bangalore who is fond of quoting John Lennon!
He did his Ph.D from Rochester University (USA) but much before that he did his schooling from Dr Graham’s Homes, Kalimpong, hence his intimate knowledge of this area. Malay who is the recipient of numerous awards and has published many papers and books, is still a frequent visitor to Kalimpong where his parents are settled.
For more on Dr Mukul please visit this link (

In the above letter sent to me by Malay, the title and italics are mine

praful rao

Monday, November 24, 2008

Images from the Landslide Hazard Workshop at Darjeeling on 21Nov2008


Comment by praful rao

My thanks to Anubhav Sood of St Joseph's College, North Point, Darjeeling and Hemkar Rana (ex - member STH, Kalimpong) for the photographs.

Sunday, November 23, 2008

An Engineer's perspective


- Er. Upendra Mani Pradhan

B.Sc., B.Tech(Hons.), M.Tech(R.P.), A.I.T.P.(India)


Landslides may rightly be called the “Tsunami of the Hills”! It is, therefore, very encouraging to note that a Landslide Hazard Workshop is being hosted on 21st. November, 2008 at Darjeeling with the eminent Geographer and Landslide Expert, Prof. Leszek Starkel of Poland attending as the Chief Guest.


Over 40 years of experience in Urban and Rural Planning has taught me that a simplistic approach, of building a wall here and a drain there, will not solve the problems of landslides in the hills. Numerous inter-connected factors come into play, requiring a deeper study of cause and effect that will finally lead us to a more Holistic Approach. A few points for interaction during the Workshop are given below :


This has been tried out by several municipalities from time to time, but the duration of success is barely a couple of months, after which the polybags reappear! The main objection being most of the marketing of goods are done in modern, attractive, polythene packages, which the municipalities cannot control. It is said that polythene and plastic bottles take as many as 400-700 years to just begin to breakdown in a land-fill – and they constitute millions of tons in garbage heaps of urban areas! Why not recycle this environmentally degrading waste material of global nuisance value into long-lasting attractive coloured modular-sized bricks for the ever growing building industry? Are the Tatas, Birlas, Mittals and Ambanis listening?? They can get their raw materials free of cost !


It is often believed that ‘Jhoras’ are the main cause for landslides in the hills. This is far from the truth. In fact, ‘Jhoras’ form part of the natural drainage system and are meant to be Nature’s ‘safety valves’ to quickly and safely carry away rainfall runoff from large hilly catchment areas, to the rivers and seas in the plain areas below, without causing any damages along the way. ‘Jhoras’ carry water and so maintain natural vegetation like trees, shrubs, grasses along their sides to prevent toe erosion. But Man, in his infinite wisdom, cuts down such trees and shrubs; indiscriminately throws waste-matter into them; removes stone boulders, cobbles and sand; blocks the ‘jhoras’ and constructs buildings on them, thereby violating all the unwritten environmental laws of Nature! Mother Nature revolts and retaliates through landslides!

Another reason is that our hill areas are bombarded with heavy rainfall during the monsoon (2000mm to 3000mm per annum). In the natural scheme of things, this precipitation partly permeates into the soil through open ground and partly flows as surface runoff and finds its way to the ‘jhoras’. But with intense urbanization in our towns, almost all open ground surfaces have been built upon or paved by roads, courtyards and footpaths, thereby all the rainfall now flows as surface runoff and enters the ‘jhoras’ with great velocity, far exceeding their normal carrying capacity. This results in toe erosion of the ‘jhoras’ which is the precursor to a landslide.

From the above it can be seen that our forefathers were no fools! They set up ‘Devi-Sthans’ (Place of worshipping Goddess) amidst ‘jhoras’for the simple reason that our ‘jhoras’ must be faithfully conserved as they have a vital role to play in our lives. ‘Jhora’ water can also be diverted into farm lands for irrigation purposes. However, in the hills, it is better not to use this water for surface-irrigating paddy crops, because stagnant water kept in the fields over a long stretch of time, may cause landslides. From careful observation, it can also be found that the percolated water through porous soil, normally finds its way back into the ‘jhoras’ at a lower point below – this is naturally filtered water, which is used by village folk for drinking purposes. Our ‘jhoras’ are sacred entities – let us spread awareness and restore them back to their pristene glory, through planned Conservation.


About a week ago, Newspapers carried bold headlines about the demolition drive taken up by Darjeeling Municipality, to knock down two of the eight storied building constructed illegally within the Municipal area. A photograph of Darjeeling Town also accompanied this news. What pained me most was the depressing photograph of the so called “Queen of Hill Stations” – virtually in Rags, with sub-standard, un-aesthetic, tall buildings piled one-on-top-of-the-other!

The same is true for Kurseong and Kalimpong Towns. In Sikkim, Gangtok, Ramphu, Namchi, Singtam and the other towns are doing no better, Mirik is a relatively new lake-town, but its overall development and upkeep leaves much to be desired. We claim that Tourism is one of our main economic planks – but once they arrive, the tourists experience a sense of deprivation and despair. There is no planning involved in all these towns and there is a great shortage of greenery, parks and playgrounds, public utilities and facilities and other infrastructure necessary to qualify as a Tourist Town. The enthusiastic tourists surely deserve a better deal!

Darjeeling and Kurseong Towns are now super saturated – all private lands have been built upon and many available public lands have been encroached and also built upon – not sparing ‘jhora’ lands! Both these towns are surrounded by tea gardens and forests, and there is no further scope for horizontal expansion in areas of low gradient. The only possibility is to go upwards, which explains why illegal construction of buildings 5-8 stories (i.e. 60 feet) high are taking place at random. Needless to say that tall concrete buildings exert excessive pressure on the land, heightening the possibility of landslides. Since land has become a very scarce commodity, Illegal constructions are now mushrooming on lands that have a natural gradient of 50 degrees or more. Exceeding the “Angle of Repose” of soil, is a direct invitation to landslides! Foolish but daring people are also building houses on the surface of old landslides, many of which have been washed away during monsoon rains. We don’t seem to learn from our past mistakes! It is distressing to note that all three Towns are sitting on time bombs – Kurseong atop the infamous Ambootia Landslide (supposed to be the biggest in Asia!); Darjeeling atop the Aloobari-Toongsoong and Jail Landslides, and Kalimpong atop the Sindebong, Bhalukhop-Alaichikhop Landslides! A disaster of unimaginable magnitude is waiting to happen anytime!!

Before India’s independence, the British never allowed any construction in the hills to exceed 2 stories, and most of the structures at that time were neat little cottages, made of wood and other light-weight materials. Now, the maximum height of buildings allowed by the Darjeeling Hill Municipal Building Bye-laws is 11.5 meters ( 38 feet) or 4 stories, assuming that room height of 8.5 feet to 9.0 feet will be sufficient for the cold climate of Darjeeling hills. This figure was arrived at during an Expert Committee meeting held at Calcutta (in which I was also a Member). The Darjeeling Municipality has now raised this to 13.5 meters!

Kalimpong and Mirik are better situated, as the Municipal areas are surrounded by large tracts of Khasmahal farm-lands. Sikkim Towns also have restricted space for horizontal expansion, as a result of which heavy RCC high-rise buildings are fast coming up everywhere, giving nightmares to everyone – especially during the rainy season!

The only solution to this problem is to follow Gandhiji’s “Back to the Village” policy and prepare and implement Balanced Regional Growth Plans for the entire hill areas, interspaced with ideally located and well planned Satellite Townships


It has been found that bamboo groves near human settlements in the hills can be dangerous. As bamboo has very shallow roots, the entire grove, having dense interlocked root system, tends to slide down as a solid mass, thereby threatening to cause big landslide damages. Some fast growing native trees with deep root system were also tried out to conserve soil on landsides. However in a few years time, the trees became very tall , big and weighty and finally the trees themselves were responsible for causing fresh landslides. What should perhaps be done is to go in for light shrubs and grasses (e.g. Vitever) with deep root system. An inventory should be made of suitable plants by the Soil Conservation and Forest Departments for immediate testing and application at landslide sites and along both sides of ‘jhoras’. Stunting of suitable deep-rooted trees to reduce their weight may also help. ‘Soil Nailing Techniques’ also sound good – but need to be thoroughly investigated for applicability in the our hills.

It is seen that major road alignments, cutting across our hills, are responsible for triggering the maximum number of landslides during monsoon period. While extensive road connectivity is undoubtedly very important, taking a road upto a certain major focal point in the rural area and then connecting this centre with other secondary villages by ropeways, for movement of both passengers and goods, could be a viable alternative for economic development of the hills, Ropeways need minimum land for putting up their towers and, therefore, cause least damages to the hill sides. While constructing roads, use of blasting technology should be avoided as much as possible, as there is risk of sliding owing to vibrations under the soil. If geological formations permit, we can also think of constructing a series of tunnels (as they have in Pune), which will also reduce travel lengths considerably.

Of late, increase of vehicle population in the hills, is simply maddening! As a result, vehicles are forced to move at crawling speed and searching for suitable space to park the car becomes an impossible and frustrating task! Better to introduce and encourage a system of mass transportation by mini-buses.


In the beginning of British Rule around 1836 – it is said that the entire hill areas of Darjeeling and Sikkim were dense forests, with no sign of urbanization as we know it today. Forests were clear-felled in a big way in and around Darjeeling. Huge migration of labour took place from Nepal, Bhutan and Sikkim and tea plantations were laid by the British. Human settlements, therefore, took place in Forest lands. In 1975, it is learnt that the total forest area in the hill region was 1141 sq. km. distributed over the 3 forest divisions of Darjeeling, Kurseong and Kalimpong. Reserved Forests covered 1113, Protected forests 9 and unclassified State forests 29 Out o the total 1141, only 466 were available for economic exploitation by the State of West Bengal. It is a known fact that the Forest Department zealously guards its property and quite rightly so, otherwise by now everything would have been reduced to barren hills. Transfer of forest lands is normally not allowed except in very rare cases when equivalent land must be handed back to the forest department by the transferee, together with cost of re-plantation. This is a wonderful system to preserve our ecology and bio-diversity.

Not much is known about “Waste lands”, but one can presume that they belong to a category of land, which has not been put to any use so far! It is high time that thorough geological studies and mapping of Waste lands are carried out immediately and appropriate steps taken to put them to good use. First and foremost, we need to identify a number of large (say 5 - 15 sq.kms. each ) suitable, physio-geographically stable areas for setting up Planned Satellite / New Townships in the region. Do we have a local qualified Hill Geologist amongst us?


For centuries in Human history, valuable lands in the plains have been reclaimed from the sea or marshes, on which planned cities and other infrastructure have been developed (e.g. Holland where 40% of land is below the sea level ; Salt Lake City in USA; Salt Lake in Kolkata; Queen’s Necklace in Mumbai). I feel that huge tracts of stable, valuable lands can also be reclaimed in the hill areas for setting up our future towns and cities.

It is observed that the most stable lands in the hills are found on hill tops and spurs. The Main Road strip of Kalimpong is located on a spur, where landslides are not known to have occurred at all. This is because drainage ‘jhoras’ are situated at quite a distance away. The catchment area on top being small, flow of water in these ‘jhoras’ is also minimal and therefore their erosion capacity is practically nil. Suppose we find a number of hillocks (preferably waste lands), adjacent to each other and having natural slopes of low gradient – then we will discover that they are separated from each other by shallow valleys at a formative stage. If we draw a cross section of the hillocks, we will see cross sectional lines having low gradient and representing less stable top soils of varying thicknesses and characteristics, below which there will be more stable soils and rocks. The thickness of the top soil can be anything between 3 feet to 10 feet or more. The idea is to bulldoze the entire topsoil and create large terraced surfaces made up of stabilized rocks. The excavated topsoil/rocks can be used to fill up the shallow valleys and fully compacted. This way we will be able to create extensive stable ground surfaces on rocky, freshly created terraced ground levels, on which we can plan out our NEW TOWNS AND CITIES! Of course, all infrastructure like roads, footpaths, multi-storied car parking, water supply, drainage, sewerage, telecommunication, public facilities and utilities etc. must be in place. Water harvesting from roof-tops, Solar Energy for heating and lighting etc. must also be part and parcel of the Project. All this may sound utopian, but this is not beyond the realm of possibility! The most attractive part of this Project is that it will be LANDSLIDE-FREE, as the unstable layers of soil on top will have been removed!! TO ACHIEVE THIS DREAM, WE WILL HAVE TO THINK BOLDLY AND DO THINGS DIFFERENTLY!! This is only a theoretical concept. WHERE IS OUR GEOLOGIST ?



My thanks to Mr UM Pradhan for this article and I would welcome photographs/ articles from anyone for this STH blog

praful rao

Sunday, November 16, 2008

A milestone on the road ahead..

21Nov 2008 marks an important milestone on the road ahead for SaveTheHills (STH). We are engaged in organizing (and I daresay this) a national level Workshop on Landslide Hazards in Darjeeling/ Sikkim Himalayas at Southfield College, Darjeeling.
While the aim of this conference is to raise awareness amongst all about the serious landslide problem here and most importantly to initiate preventive and mitigation action against this hazard, it is also to commemorate the 40th anniversary of the Oct 1968, disaster when thousands perished in this part of the world in landslides triggered by torrential rains.
Also, exactly 40 years ago in November 1968, a young geographer from Poland arrived here to study landslides and on 21Nov08 the same person- Prof Leszek Starkel, now a world famous scientist and recipient of numerous awards joins us for the workshop as our Main Speaker.
I have placed above the invitation front cover and the program schedule for the workshop.

praful rao

Saturday, November 8, 2008

Why SaveTheHills (STH) must prevail...

Two days ago, Prabal Ghatraj (SLIDE 1) of Lower Sindebung, Kalimpong met and told me what is now a familiar story. He and his brother are unemployed and live with their family of 7 in Lower Sindebung.
Some years ago they used to get 25 murrees of rice from 4.65acres of land, now that has shrunk to a mere 3 murrees because they have lost 3 acres of land to landslides. Copies of the letters which they submitted to the govt authorities years ago are placed as SLIDE 2 and 3. (SLIDE 3 documents some of the farmers who have lost land and the amount of land lost in Sindebung, Kalimpong)
There has been no reaction from any where.

Sindebung has featured on this blog many times and is a place where the landslides are due to drainage problem - one which can be corrected, given the will and the resources.
It is issues such as these that STH endeavors to take up at the highest levels and will certainly be highlighted in the forthcoming Landslide Hazard Workshop which is being organized by STH at Darjeeling on 21Nov2008.

praful rao

Tuesday, November 4, 2008


"Across the world in every kind of environment and region known to man, increasingly dangerous weather patterns and devastating storms are abruptly putting an end to the long running debate over whether or not climate change is real. Not only is it real but it is here, and its effects are giving rise to a frighteningly new global phenomenon : the man-made natural disaster"

- Barack Obama


Comment by praful rao

I do hope the CHANGE that may sweep thru America in the next few days will also take place in Disaster Management in this part of the world and that landslide prevention and mitigation will take on a new meaning and urgency.

My thanx to Dr David Petley of Durham University for the above quote.