Khadakwasla Dam

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Khadakwasla Dam
Khadakwasla Dam image.JPG
India Maharashtra location map.svg
Red pog.svg
Location of Khadakwasla Dam in Maharashtra
Official nameKhadakwasla Dam
LocationKhadakwasla Village, Pune, Maharashtra
India
Coordinates 18°26′30″N73°46′5″E / 18.44167°N 73.76806°E / 18.44167; 73.76806 Coordinates: 18°26′30″N73°46′5″E / 18.44167°N 73.76806°E / 18.44167; 73.76806
Opening date1869
Owner(s) Government of Maharashtra
Dam and spillways
Impounds Mutha River
Height31.71 m
Length1939 m
Reservoir
CreatesKhadakwasla Lake
Total capacity341 million cubic meter

Khadakwasla Dam is a dam on the Mutha River 21 km (13 mi) from the centre of the city of Pune in Maharashtra, India. [1] [2] The dam created a reservoir known as Khadakwasla Lake which is the main source of water for Pune and its suburbs.

Dam A barrier that stops or restricts the flow of surface or underground streams

A dam is a barrier that stops or restricts the flow of water or underground streams. Reservoirs created by dams not only suppress floods but also provide water for activities such as irrigation, human consumption, industrial use, aquaculture, and navigability. Hydropower is often used in conjunction with dams to generate electricity. A dam can also be used to collect water or for storage of water which can be evenly distributed between locations. Dams generally serve the primary purpose of retaining water, while other structures such as floodgates or levees are used to manage or prevent water flow into specific land regions. The earliest known dam is the Jawa Dam in Jordan, dating to 3,000 BC.

Mutha River river in India

The Mutha River is a river in western Maharashtra, India. It arises in the Western Ghats and flows eastward until it merges with the Mula River in the city of Pune. It has been dammed twice, first at the Panshet Dam, used as a source of drinking water for Pune city and irrigation. The water released here is dammed again at Khadakwasla and is an important source of drinking water for Pune. One more dam has been built later on the Mutha river at Temghar.

Pune Metropolis in Maharashtra, India

Pune, is the second largest city in the Indian state of Maharashtra, after Mumbai. It is the ninth most populous city in the country with an estimated population of 3.13 million. Along with its extended city limits Pimpri Chinchwad and the three cantonment towns of Pune, Khadki and Dehu Road, Pune forms the urban core of the eponymous Pune Metropolitan Region (PMR). According to the 2011 census, the urban area has a combined population of 5.05 million while the population of the metropolitan region is estimated at 7.27 million.

Contents

In the vicinity of Khadakwasla Dam is the National Defence Academy (NDA), the Defence Institute of Advanced Technology (DIAT), the College of Military Engineering, Pune (CME, Dapodi) and Central Water and Power Research Station (CWPRS). A few kilometres to the south lies Sinhagad Fort; the twin dams of Panshet and Varasgaon, which mainly supply water for irrigation but also feed into Khadakwasla Lake, lie just 8 km due west of the backwaters of Khadakwasla Lake.

National Defence Academy (India) military academy of Indias combined military forces

The National Defence Academy (NDA) is the Joint Services academy of the Indian Armed Forces, where cadets of the three services, the Army, the Navy and the Air Force train together before they go on to respective service academies for further pre-commissioning training. The NDA is located in Khadakwasla, Pune, Maharashtra. It is the first tri-service academy in the world.

Defence Institute of Advanced Technology

Defence Institute of Advanced Technology (DIAT) is the premier Deemed University under the Department of Defence Research & Development, Ministry of Defence, Government of India. DIAT (DU) is specializing in the training of officers of Indian Armed forces, Paramilitary forces, Defence Research Organizations, Ordnance Factories, Defence PSUs and other central and state government agencies.

College of Military Engineering, Pune

College of Military Engineering (CME) is a premier technical and tactical training institution of the Indian Army Corps of Engineers of the Indian Army, this includes Combat Engineers, Military Engineering Service, Border Roads Engineering Services (BRES) and Survey.

Khadakwasla Dam burst at 7:30 am on 12 July 1961, causing the greatest ever disaster to strike Pune. It was not blown up, as some have been led to believe, it simply collapsed at the point of greatest impulsive force, unable to withstand the destructive forces generated by three times the quantity of water gushing in from upstream than it was meant to store at peak capacity as placid water.

Design

The Khadakwasla Dam is 1.6 km (1.0 mi) long. The dam has been built on the Mutha River, which begins from the confluence of the rivers Ambi and Mose on which the Panshet and Varasgaon Dams are built respectively, and the outflow from Temgarh Lake through Temgarh Dam [3] about 15 km (9.3 mi) north of Varasgaon Dam into Khadakwasla Lake. Mose river has been referred to as Mutha river and shown as such on some maps. [4] The length of the Khadakwasla backwaters is nearly 22 km (14 mi) and the width varies from 250 to 1,000 m (820 to 3,280 ft). The maximum depth in the lake is 36 m (118 ft). The dam has 11 radial type sluice gates and six irrigation outlets, flowing into two canals as explained below. Of the three feeder lakes, Varasgaon is the largest, followed by Panshet and Temgarh, in that order. The source of Panshet is close to the base of both Raigad and Torna Forts and Panshet is the highest of the three, some 30 m (98 ft) higher than Khadakwasla. Varasgaon Lake is at the same level as Khadakwasla, and only water released deliberately moves into the Mutha, and then, on to Khadakwasla. Fort Raigad does not reach the imposing height of Sinhagad Fort, stopping at 2851 feet above sea level. [5]

Varasgaon Dam dam in India

Varasgaon is a dam on the Mose river which supplies water to city of Pune, Maharashtra, India. It is situated on Mose river. It is also called Veer Baaji Pasalkar Dam. It is one of the three major dams which provide water to Pune city. It is located around 40 km from Pune city. The Panshet dam is adjacent to Varasgaon dam, and together both have become a popular picnic spots.

The Panshet reservoir has a capacity of 2.70 million cubic meters, with Varasgaon reservoir, a larger body, having even more. The Khadakwasla Dam was founded on hard rock. It had a height of 31.25 m (102.53 ft) above the river bed, with a 8.37 m (27.46 ft) depth of foundation. Its crest length was 1.47 m (4.82 ft) and has a free board of 2.74 m (8.99 ft). The dam had a flood capacity of 2,775 m3/s and a reservoir of 2.78 million cubic meters. It cannot accept water from both Panshet and Varasgaon together, unless its sluice gates are fully open, causing an overflow of water into Pune, which would perforce allow the waters to end up in the Bhima River and add to water in reverse flow into the Mula River coming East all the way from Mulshi Lake and Dam south of Lonavla, a hill station some 50 km (31 mi) west of modern Pune. The plan envisaged control of these three dams to benefit the rapidly expanding city of Pune. The original dam, built in 1879 as a masonry gravity dam founded on hard rock was the first of its kind in the world. [6] [7] [8] This dam was designed by Sir M. Visvesvaraya. [9]

Lonavla Hill station in Maharashtra, India

Lonavala or Lonavla is a town and a hill station Municipal Council in Pune district in the Indian State of Maharashtra. It is about 64 kilometres (40 mi) west of modern-day Pune city and 96 kilometres (60 mi) from the city of Mumbai. It is known for its production of the hard candy chikki and is also a major stop on the railway line connecting Mumbai and Pune. From the Pune suburbs, local trains are available from Pune Junction. Both the Mumbai-Pune Expressway as well as the Mumbai-Chennai highway pass through Lonavala.

Many people come here on weekends and during the monsoon season. Scenic places around the dam include Peacock Bay, Kudje village, and Neelkanteshwar, located near Bahuli village just past Kudje. The Sinhagad road, bordering the dam, has become a favourite picnic spot. There is a "Chowpatty" offering snacks, fast food and non-alcoholic drinks. Peacock Bay, however, is out of bounds to the public at large, being part of the NDA, a Defence Forces establishment.

Peacock Bay is a part of Khadakwasla Dam's lake. This bay is owned by the National Defence Academy, Pune. The name is due to the large numbers of peacocks found in this area. Other animals found in this area are deer, lion-tailed macaques and civets. This lake covers an area of about 501 km2, and the depth varies from 40 to 120 feet. This bay hosts various competitions like the annual national inland championship, open lake swimming competition, etc. This lake is a venue for water sports in Pune. This bay is just 12 km away from Pune and is situated on Mutha River.

Water Quality

The backwaters of Khadakwasla Lake, right up to Panshet, Temgarh and Varasgaon dams and lakes, as well as the water in the Ambi/Mutha/Mose river/rivulet do not pass through tenanted areas, limiting induction of pollutants to natural levels. There is no discharge of effluents into these water bodies yet. Filtration of such water is therefore easy and the establishments around Khadakwasla Lake get potable water without much effort. In fact, Lavasa minicity, which was being built on the northern fringe of Varasgaon lake had its construction halted by the Bombay High Court on 7 December 2010, due to its proximity to the lake as it was feared that it could lead to progressive contamination of the water supply to Pune. [10] The dams on the lakes are now turning into tourist spots [11] and the outgoing water might suffer a drop in quality, unless controlled.

Lavasa Town in Maharashtra, India

Lavasa is a private, planned city being built near Pune. It is stylistically based on the Italian town Portofino, with a street and several buildings bearing the name of that town.

Bombay High Court High Court of Judicature at Mumbai

Bombay High Court is one of the oldest High Courts of India. It is located in Bombay, Maharashtra. Its jurisdiction covers the states of Maharashtra and Goa, and the Union Territories of Daman and Diu and Dadra and Nagar Haveli. The High Court has regional branches at Nagpur and Aurangabad in Maharashtra and Panaji, the capital of Goa.

In a modernisation programme, the two existing canals from Khadakwasla Lake will be upgraded to prevent losses due to evaporation, seepage and theft. The first 32 km outbound of the right bank canal will carry water via an underground tunnel and the land above used for public amenities. The left bank canal that supplies drinking water will now be replaced by a pipeline. The programme envisions all canals in Pune replaced by pipelines. Put together, there will be a huge saving of relatively less polluted water, which will then be used to meet the vastly increased demand in volume of water consequent to the expansion of Pune City.It is a great source of water supply for pune. [12]

History

The birth of Khadakwasla lake took place due to the severe droughts during the 19th century in East Pune that paralysed crop growth and prompted engineers to take up major irrigation works. Captain Fife RE of the British Army recommended a high level reservoir at Khadakwasla in 1863 and subsequently carried out detailed surveys and investigations. This man-made lake was therefore named after him, Lake Fife. It was renamed Khadakwasla Lake shortly after independence. The work on one of the oldest masonry dams of India began in 1869 and was completed in 1879 at the cost of Rs. 65 lakhs (INR 6.5 million, then the equivalent of US$2 million and GB£600,000). [13]

Flood of 1961

Panshet Dam was nearing completion in July 1961, [14] designed essentially to regulate the supply of water to Khadakwasla Lake, in such a manner that the huge reservoir would have more than adequate water for the people of Poona (Pune). The reservoir is the source of water for the two canals referred to above that start at Khadakwasla. The right bank canal is 112 km (70 mi) long and irrigates about 45,000 hectares (170 sq mi) of land in Pune district and the villages around Haveli, Daund, Indapur and Baramati, while the left bank canal supplies drinking water to Pune, Kirkee and surrounds. [15]

Panshet Dam was zoned at a height of 51 m (167 ft) with impervious central core outlet gates located in a trench of the left abutment; hoists were not fully installed when floods occurred at the site of construction. The reservoir had a capacity of 2.70 million cubic meters. Between 18 June – 12 July 1961, the recorded rainfall was 180.3 cm (71 in), stressing Panshet dam to its limits. [16] The average rainfall for that period is 125–130 cm (49.2–51.2 in). [17]

Khadakwasla Lake was already 90% full, with water flowing in freely from Varasgaon, besides the abundant rainfall. The people of Pune had no idea of their fate. The rain caused such a rapid rise of the reservoir water level at Panshet that the new embankment could not adjust to the dangerous loading condition. Water rose at the rate of 9 m (30 ft) per day initially, and 24 m (79 ft) in 12 days. Due to incomplete rough outlet surface, the flow through was unsteady which caused pressure surges. Cracks were formed along the edges of the right angles to the axis of the dam causing a subsidence 9 m (30 ft) wide, leaving the crest of the dam 0.6 m (2.0 ft) above the reservoir level on 11 July. The failure was attributed to inadequate provision of the outlet facility during emergency. This caused the fateful collapse of the structure above the outlets. [16]

Panshet Dam had been cleared for construction under the aegis of the Bombay State Irrigation Department. When the State split into Maharashtra and Gujarat in 1960, Panshet Dam came under the supervision of Maharashtra State Irrigation Department. Mr. SM Bhalerao was the executive engineer in charge of Panshet dam, and Mr. MR Panse (both deceased), the plant engineer. They were running out of time, since this project was their first major assignment and the area of work hostile. Former secretary of the state irrigation department, Madhukar Deshmukh, who had worked as a deputy engineer at Panshet dam till late 1959, explained what actually went wrong. According to him, the dam was planned as a fully earthen one with a height of 61 m (200 ft). Given the nature of the dam, an outlet to the downstream Khadakwasla reservoir was created at its base. Deshmukh said, "Ideally, the arch of the conduit should have been made from RCC. However, in those days, steel was in short supply and we were forced to use concrete blocks instead." The force of the water was so great that it managed to dislodge the concrete blocks, which resulted in the earthen portion of the dam giving way. [18] They had made a desperate appeal for help and manpower augmentation, and the Area Commander, Southern Command, Lieutenant-General Chaudhari reacted swiftly, keeping Commandant NDA, Rear Admiral BA Samson in the loop. Assistance was provided using a semi-prepared road from Peacock Bay, NDA to Panshet along the Mutha river/backwaters of Khadakwasla Lake and also via Mulshi Lake. Engineering officers from BEG, College Of Military Engineering (CME) and close to 3,000 personnel moved out just after sunset.

3,000 soldiers from the Bombay Engineer Group and Centre (BEG), the College of Military Engineering (CME) and other units were dispatched by HQ Southern Command, Pune, to help. They formed a human chain at Panshet Dam, as Army and commandeered civil trucks brought sandbags by the tens of thousands to shore up Panshet Dam. The engineers were certain the dam would collapse; they were praying that the Armed Forces personnel's aid would delay the inevitable to dawn, so that the people of Pune could be warned in time and those living on the banks of the rivers Mutha and Mula could be evacuated. Despite their best efforts, Panshet Dam caved in at 0330 hrs on 12 July 1961. Khadakwasla Dam was the last barrier. [19] The dam stood firm till well past dawn, contributing to the safety of residents living downstream in the vicinity of the path of least resistance to the surging freestream water.

It took another four hours for Khadakwasla Dam to breach, causing devastating floods in Pune. A 120 m (390 ft) central section of the dam gave way. [13] Word had been passed around the few people living on the swampy land next to the two canals early in the morning. The authorities started moving out the residents living near the riverside. Many residents fled to higher grounds, some all the way to the Parvati Hill. Apparently, All India Radio did not broadcast any warnings, and was playing a regular scheduled music program when the floods struck. The low-lying areas of the old city were almost completely submerged. Except for the rail bridge of the Sangam Bridges, two adjacent bridges built separately for rail and road traffic and Bund Garden Bridge, all other bridges were under water as well. Water rushed into the old ‘Peths’ and along Karve Road, Deccan Gymkhana areas. For many hours, the high water levels persisted. Roughly speaking, Panshet water reservoir stores enough water for all of Pune’s city needs today (today’s needs are probably 8-10 times more than the requirements of the 1960s).

After the water receded fully, some three days later, the stench of the aftermath of flooding stayed on for nearly three months. A large number of people sold their land and houses at rock-bottom prices and moved away. Pune's development plans were put on hold till normalcy was achieved. Bhalerao and Panse were blamed for oversight and lack of common sense in not constructing a wide reinforced archway in the centre of the mudwork dam for water to flow through. [18] The old riverside city landscape changed forever. New localities (such as Lokmanya Nagar, Gokhale Nagar, etc.) were set up to resettle some of the flood affected citizens. Most of the bridges were damaged and needed fixing and in some cases complete rebuilding. [20]

The dam was later rebuilt over four years. In this period, residents of Pune and its suburbs had to face water rationing. While Pune city, Camp and Cantonment area were not too severely affected, people in Khadki (Kirkee), Dapodi, Bopodi, Phugewadi, Hadapsar, Shivajinagar and Deccan Gymkhana had limited water supply. [21] At the National Defence Academy (NDA), Peacock Bay, the Naval cadets training section and the lakeside guest rooms were submerged. The view from the NDA Commandant's house, which overlooks the entire lake and dam, was distressing.

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