Executive Summary This case study is mainly focused on the problems faced during the design and construction of Bhakra-Nangal Dam which is ascertain in northern part of India across the Sutlej river
This case study is mainly focused on the problems faced during the design and construction of Bhakra-Nangal Dam which is ascertain in northern part of India across the Sutlej river. The prime focus of engineers is on the flooding situation that was occurred due to the snow melting of Himalaya or in monsoon season due to access of flow of water and bringing disaster to entire countryside. At this circumstance, they also want to harvest that access unaccustomed and wasted water of river Sutlej valley into a large irrigation purpose for the major ruin states of India as Rajasthan, Haryana, and Punjab. For the record intention, the FFA(flood frequency analysis) of the Sutlej has been done by different methods. The study has been done to find out the peak flood for a certain return period and to find out how often a flood of a certain magnitude occur, from the collected data.
Bhakra is exquisite structures worked as solid gravity Dam over the Sutlej stream, Latitude at 31° 25′ 00″ N and Longitude at 76° 24′ 00”, closer to the outskirt amongst Punjab aa well as in Himachal Pradesh on the north side of India. The development of this project was begun in 1948 and was ende in October 1963. This structure, spreading over the restricted pleasant canyon at the foot of the mountain, needs to rise 680 feet, sheer from the rough bed of the Sutlej and keep running crosswise over for 1700 feet at its best. At the end of the day, almost three Qutab Miners should be moved to achieve the maximum height of Bhakra Dam. At the bed level, it will have a powerful width of 625 feet. To permit the undesirable surge waters to stream over the dam, focal spillway 260 feet since a long time ago controlled by four steel entryways will be introduced. To discharge water for motivations behind water system from the Bhakra Reservoir, 10 outlets will be given in every one of two levels at ascertained statures. Between these outlets, 106,000 cubic feet for every second can be let out for deluge areas downstream and in a blend with the spillway, altogether 290,000 cubic feet of water can be let out of the supply at a given moment.
The BN Reservoir will have the capacity to store 7.4 million-section of land feet of water-enough to cover the cultivable zone year of the Indian State of Punjab under one foot of water each year. Be that as it may, this water, be that as it may, won’t be accessible for coordinate usage, claiming 1.7 million-section of land feet at the base of the supply should be considered a consistent aggregation of the residue brought around the stream from its Himalayan catchment. Hence, the water system framework has been decided for just 5.7 million-section of land feet. Some portion of the water liquidated for water system from the BN Reservoir is planned to produce a regulator at the base.
It is away from 8 miles downstream from the Bhkra Dam site, which was the primary to be endeavored for progress and which was finished in 1951, not just serves to redirect the managed spill out of the Bhkra Reservoir into the Nangal Hydel Canal yet additionally goes about as an adjusting store for the powerhouses that will be positioned on the Nangal Hydel Canal.
Nangal Canal and Power Houses
The Nagal Hydel Canal is a water system cum-Power channel which carries water to the Bhkra Irrigation System and makes hydroelectric power. In estimate, it is one of the greatest at any point endeavored in the Punjab State, maybe unparalleled on the planet. Intended to convey 14,500 cubic feet of water every second for the first 9,700 feet of its length, and 12,500 cubic feet for each second from there on, this lined waterway will have a profundity of 20.6 feet and will be around 140 feet wide at the best a man-made stream. It takes off on the left bank of the Sutlej over the Nagal Dam and runs parallel to the stream through the tough sub hilly districts of the Shivalik foot Hills, navigating various gorges and slope downpours in its way. overall, there will be 58 such intersections, a significant number of which require the channel to be conveyed at an impressive stature over the ground level. The incline of the channel from the Nangal Dam has been designed to the point that the more extreme normal slant of the encompassing can be made utilization of to make fake falls along the trench by methods for which hydropower can be created. There will be two powerhouses at the twelfth and eighteenth miles of the waterways with an introduced limit of 48000 kilowatts. in each. The arrangement has been made for the establishment of an extra unit of 24,000 kW. in every solitary of the power houses.
The Irrigation System
The BN Canal network will make a system of major and minor channels racing to an aggregate length of 2,890 miles. The primary feeder trench of this network, the Bhkra Main Line will take off from the tail of the Nagal Hydel Canal and will be 108 miles solitary fixed with impenetrable tile workmanship containing a sand-witched layer of mortar all through its length. From this will stretch out the primary courses of the network, connecting like veins to lead 12,500 cubic feet for every second of much-required water to the dry terrains on both sides.
Salient Features of BN Dam
The material properties of concrete dam and foundation rock used in the case study are given at below table. For this purpose, the density of water taken as 1000kg/cu.meter to consider hydrostatic pressure on the upstream face. The compressive strength of concrete FC is assumed 20 N/mm2.
Area Near Village Bhakra Dist. Bilaspur HP, India
Latitude 31° 25′ 00″ N
Longitude 76° 24′ 00” E
River basin Indus
Type of Dam Concrete straight gravity
Elevation at Top of Dam El 518.16 m (1790 feet)
Maximum Height above the deepest foundation level 225.55 m (740 feet)
Maximum Height of dam above river bed 167.64 m (550 feet)
Length at top 518.16 m (1700 feet)
Width at top 9.14 m (30 feet)
Length at bottom 99 m (325 feet)
Width at base 190.5 m (625 feet)
Elevation at top of dam above mean sea level 518.16 m (1700 feet)
Steel used 101600 tons (100000 tons)
Catchment area 56980 Sq. kilometers.
Normal reservoir level EL. 512.06 meters (EL.1680 feet)
Dead storage level EL.445.62 meters.
New area irrigated 60 lakh acres.
Area of reservoir. 162.48 sq. kilometers (62.78 sq. Miles)
Length of reservoir. 96.56 kilometers.
Live storage capacity at EL.1680 ft. 6911 million cum (5.60 MAF)
Gross storage capacity at EL.1680 ft. 9340 million cum (7.57 MAF)
Dead storage capacity 2430 million cum (1.97 MAF)
River Outlets & Flood Control Gates
Number of outlets. 16 in two tiers of 8 each at EL.1320 & EL.1420
Size of outlets 2.64 m x 2.64 m (8.67 ft. x 8.67 ft.)
Shape of outlets Horseshoe shape
Maximum discharge per outlet
Outlets at EL.402.33 meters (EL.1320 ft.) 187.97 cumecs (6638 cusecs)
Outlets at EL.432.80 meters (EL.1420 ft.) 160.10 cumecs (5656 cusecs)
Number and sizw of flood control gates. 4 nos. 15.24m x 14.5m (50 ft. x 47.5ft.)
Maximum design discharge through gates. 5587 cumecs (1997300 cusecs)
Bhakra Power Plants
Stakeholders of Bhakra Project
NO. Stakeholder Name
1 Owner Bhkra-Control Board
Govt. of Punjab
Govt. of Rajasthan
Govt. of Haryana
2 Construction Manager All the Chief Engineers
Dr. A.N.Khosla and Er. Kanwar Sain,
3 Developer Bhkra-Control Board
& Indian Engineers of the Dept. of Irrigation.
4 Designers (A/E) Int. Company Inc. USA
5 Contractors Mr. M.Harvey Slocum & team USA
6 Community Public of Punjab, Rajasthan
7 Ministry of Finance, Government of India Joint Secretary
8 Central Water and Power Comm., Govt. of India Chairman
9 Local Wildlife Pets, Birds and aquatic animals
Planning and Design
The proposition to build a capacity reservoir on the Sutlej first time began in a note dated 8 November 1908 by Sir Louis Dane showing Suni and Badu Gorges as being positive destinations for dams for volume and power improvement. An itemized provide details regarding this proposition was submitted in March 1910. Notwithstanding, the evaluated cost of the venture was viewed as restrictive and the task was retired.
The 1919 undertaking report accommodated the measurements of the unutilized satluj water amid the time of abundance stream and basically comprised of the accompanying four major works: successively Bhakra Dam, Upper Sirhnd Canal, Lower Sirhnd Canal, and The Western Ymuna Canal.
The projected dam stood to be 120.40m (395 ft) high situated around 69 km (43 miles) from Ropar nearly at a vague place. It billeted a most extreme stockpiling of 3182.38 million m3 (2.58 million-section of land ft). The task was completely upheld by topographical examinations did by the G S of India. The 1919 venture, in any case, never emerged and was retired for the Sutlej Valley Project authorized in 1919. A proposition of the Project amid 1920-1938. The 1919 Project even though not sought after further, brought about a advance of inspections and investigation of the Bhkra Gorge by protuberant Geologists and Engineers. on his proposals floats were uncovered on the two banks of the waterway over the late spring surge level to uncover unweather vibration at the barrier site.
Also making arrangements for venture report was resubmitted with nitty gritty report by various boss specialists successively in 1939 by Dr. A.N. Khosla, in 1944 by Dr. J.L. Savge, the then CE, USBR was requested for by the Punjb Govt to look at the site and cover the likelihood of development of a barrier with greatest supply level at El.487.68m (1,600 ft) and in 1945-47 under the administration of Dr. F.A. Nickll, a US Geologst of remarkable experience and gave point by point land data to the resulting configuration work.
In 1945-46, report arranged by the Int. Eng. Co. Denver, U.S.A. concerning plans, with the greatest store at El.481.58 m (1,580 ft).
Also, in the middle of 1948-1951 last intention of the Plan is submitted when water system and power requests of the parceled province of Punjb on the Indian side additionally expanded, the topic of the tallness of the barrier, the best height which was settled at El. 487.68 m (1,600 ft) just to keep the submergence of Bilspur town, was checked on and it was chosen to develop the barrier to the most extreme safe ideal stature as controlled by establishment shake conditions, in order to completely misuse water system and power potential.
In 1951, a reconsidered venture report put together by the Irrigation Branch (PWD) of Punjb and Int. Co. Inc. The USA. was set up for the 207.26 m (680 ft) height for this structure.
In their last proposition there are a few units have been built as principle collection of dam starting as Bhkra Dam and Power Plants, Nagal Dam, Nagal Hydel Channel, Gangwal and Kotlla Power Houses on the Nagal Hydel Channel, Remodeling of Ropar Headworks, Remodeling of Sirhnd Canal, Bhkra Canals, Bist Doab Canal, Transmission and conveyance arrangement of electrical vitality, and Development of business sectors and correspondences of Bhakra zone.
Therefore, with the above proposition, BN Project took the state of a genuine multi-reason venture, giving water system and power age as its fundamental advantages and offices for surge counteractive action, entertainment and fish culture as coincidental points of interest.
The Construction Phase of BN Project began amid 1951 to 1963. In the beginning period of project design of rail-head was begun in 1946 and street organize developed was begun in 1947 to Ropar Punjb to Nagal, and on that way, the fundamental foundation began coming up simply after 1948.
Two extremely fundamental choices were taken by Indian Planners and Engineers. One was to assemble the Bhkra Canal System first in inclination to Bhkra Dam and the other to develop the Dam departmentally with the assistance of remote specialists. Even though USBR outlined advisor for Bhkra Dam, the execution came in the hands of Indian Eng. of the Dep’t. of Irrigation. The undeniable development movement began simply after April 1952 when Mr. M.Harvey Slocum landed with his group of development experts and specialists from America.
This is the greatest multipurpose venture of India beside the Narmada. It was developed with the co-activity of Punjb, Hayana, and Rajsthan. Its cost of development was Rs. 2,380 million. The possibility of development of Dam goes to Sir Lois Dane, the then Governor of Punjb. The aggregate territory secured by the BN Dam is around 168 sq. km, of which 90% is the piece of Bilspur and 10% of the region has a place with the Una locale. The development of the Barrier started in the year 1948 and was finished in 1963.
This structure 518-meter-long and 226-meter-high were developed at Bhkra on stream Sutlej in HP. The Nagal dam in Punjb is just 29 meters high. Here a Canal 63 km long has been built. Two powerhouses-Gaguwal and Kotlla have been developed on Nagal hydel channel. A simulated lake called Gobiind Sagar has been made. This lake collects water of R. Sutlej and R. Beas. The limit of the entire venture is 1204 megawatt.
Although, this tremendous structure has a multiple list of significant aspects, BN was an overdeveloped dam. The main problem that I found in my research work was water logging and salinization in the Bhkra command region. Foremost of the downstream region of Nagal and Rupar due to the diversion of water their region is dominated by silt and clay, due to that siltation live capacity is lost by 10%. This type of bad effect delivers the fertile soil into unproductive. It brings in notice that every year around 2 million tons of salt has estimated in Hayana canal.
The second problem that I found in my research was Submerged land. Due to the Bhkra project around 10000 acres of agricultural land and 20000 acres of forest land submerged into the catchment are. With this circumstance, about 371 village people displace from different province of Punjb and Hayana.
The third problem that I found in my research was sedimentation as well as siltation. For any reservoir it is natural and unavoidable process. In Indus river basin there are also considerable amount of sediment occurred due to deforestation, excavation, quarrying, mining, construction etc. In the case of BN reservoir sediment was estimated at 2417.7 Ha.m or 19600-acre feet. It was also estimated that full silting would take place in 535 years. Irrigation benefits were expected to be affected after 25% silting of the live storage, which was calculated to be after 135 years. In 286 years, 50% silting of live storage was anticipated.
There was other issue with wood transport is also happened on the project. Because of the river Sutlej has been the cheapest means of transporting woods from the Himalayan forests down to the plains. But since the dam is very high above the river water level, it has become impossible to use this river for this purpose. There are several problems which identified as, the suggested region to be irrigated by this project had been badly exaggerated.
To fulfill the irrigation crisis in 1950s- the proposed BN dam planning was going badly as post completion cost estimates was not considered for the irrigation canal system. As the engineers incorrectly considered the cost of structure construction that has irrigation capability with the diverting and storing water as final distributaries to catchment area. The reason behind that is the lack of experience in various states of chief engineer as well as planners. Due to that the budget cost overrun as well as crisis placed in center stage where high scale irrigation problem occurred.
BN project is failed to prove his virtue of design as the reportedly resubmitted planning was not fully satisfied its design because of that the mean storage available from Bhakra reservoir was calculated to be 4.631 MAF against a requirement of 6.207 MAF resulting in a shortage of about 25.4%.
Although the project was reportedly resubmitted many times, but from the land acquisition side all land in north part of BN has same kind issues. For the provisions of water logging we must consider solution of mainly two types- for the vertical drainage called as surface drainage is removed with simple pump out method. And for horizontal drainage called as sub-surface drainage, we must set up series of perforated pipes which is dig inside the ground and draws out excess water.
To prevent salinization of soil is to prevent waterlogging, since water logging is responsible for drawing out the salts from the soil. Another important way to prevent salinity is to avoid irrigation with saline ground water.
Out of the 7209 families, 5030 opted for cash compensation under the terms of Land Acquisition Act and resettled elsewhere on their own. Of the total land acquired, 14200 acres was forest land, 30240-acre land was revenue land and 27516-acre land were privately owned land. For the urban displaced, a new town of Bilspur was built just 2 km away on the high land overlooking the old town and two thousand urban families resettled here.
To mitigate the reservoir sedimentation, we must measure Watershed management activities in the catchment area, Creation of off- channel auxiliary/ retarding reservoirs, Creation of bypass canals to divert sediment- laden flows around the reservoir and Removal of silt by mechanical means.
The problem is overcome by bringing logs of woods from Govind Sagar to Nangal railway station by means of an aerial rope-way. This is about St miles long. A wooden log loom has been put across Govind Sagar to obstruct timber. From there, the timber is taken by the inclined carriage way to the loading station on the upstream of the right side.
Critique of Chosen Solution
The chosen critique solution for this given project is deliver based on Construction Management theory approach. For this project, it is always necessary to avoid and overcome as much as uncertainty as possible when planning project can be difficult process. Some of these difficulties includes: poorly defined scope of works, inadequate risk assessment, time uncertainty and cost analysis. For the success of project, it is required to follow the project management plan accordingly. Cost analysis is always crucial in success of project. Therefore, it is prime step to make appropriate estimation at the pre-planning of project. As being able to handle the project not to go overrun and completed on time is matter of establishing guidelines. Costs can be control through the efforts of all stakeholder, appropriate use of equipment and technologies and resource management.
For this given project it is necessary to develop techniques related to water bodies as well as ground water reclamation.