Hydro electric power plant,site selection, classification of HEPP,criteria for turbine selection, dams, spillways, surge tank and forebay, advantages and disadvantages of HEPP, hydrograph ,flow duration curve ,mass curve,environmental impacts of HEPP

1. HYDRO ELECTRIC POWER PLANT
Prof. Siraskar G.D. (www.siraskar.com)
Mechanical engineering department
PCCOE&R

2. Hydroelectric Power Plant: Introduction, Site Selection, Advantages and
Disadvantages of HEPP,
Hydrograph , Flow duration curve ,Mass Curve, Classification of HEPP with
layout.
Power from water
First in India at Darjeeling of 200 KW in 1897 and first major in
shivasamudram in mysore in 1902 of 4.5 MW,
Principal: water is stored in Dam (artificial storage) having potential
energy .
Power = wQH/ 1000 KW
Hydro eclectic power plant:
Advantages
Disadvantage

3. Hydro eclectic power plant
Advantages:
•Less operational cost
•Reliable, starting and stopping is easy compared to
thermal and other power plant
•No pollutant of any kind
•Life is high..more than 50 years
•Part load efficiency is high
•Can be used as base or peak load, less staff required
•Plant is useful for irrigation , flood control
•No fuel required
Disadvantages:
Power developed depends on water availability.
Plant located always from load
Time required to build such power plant (Dam) is high.
High capital cost
Disturb ecology.

4. Hydrology:
Hydrology deals with the occurrence and distribution of
water over and above the earth surface.
Based on meteorology, geology, agricultural physics,
chemistry, botany and other data
Mean rainfall data of 20 to 30 years, dry frequency.
Help in estimation of rainfall, water collection , output of
power plant prediction.
Calculation of dam capacity, if more rain fall spill way
estimation.

5. Hydrological cycle:
Hydrological cycle deals with the rain fall and run off study.
The cyclic movement of water involves the following
a) Evaporation of water from sea to atmosphere
b) Precipitation of vapour from atmosphere
c) Flow of water from river back to sea

6. •The water which precipitation from atmosphere may be in the
form of rain fall, snow fall dew and mist.
•Out of the total precipitation , some water is evaporated and
infiltrated into soil to form underground storage.
•The remainder of the rain water flows on the ground surface of
the catchment area to form the stream and it is called run –off.
•This rain water run –off over the ground surface which makes
its way towards the stream, lakes, rivers and sea.
•The run-off of a catchment area is the total quantity of water
which flows into a stream or into reservoir during specific period.
•It is measured in terms of centimeter of water over catchment
area. Thus the total volume of water can be calculate. It helps in
designing and planning of power plant

7. Flow duration curve and power duration curve:
Flow duration curve are plotted by taking the magnitude of run-
off on the ordinate against the percentage of time taken on
abscissa.

8. power duration curve:
If we take the potential power contained in a stream flow on
ordinate and time on abscissa.

15. •Good sit have a large catchment area, high average
rain fall, steep gradient in area to get high head
•Dam selection: quantity of water available
•Head , storage
•Distance from power demand
•Soil bearing capacity , rocky foundation condition
•Availability of construction material
•Access to site
•Transport
•Cost of project and period
•Free from earthquake damage, away from zone
•Free from mineral deposits of harmful nature
•Less possibility of sediment collection

19. The Three Gorges Dam is a hydroelectric gravity dam that spans the Yangtze
River by the town of Sandouping, located in Yiling
District, Yichang, Hubei province, China. The Three Gorges Dam is the world's
largest power station in terms of installed capacity(22,500 MW). In 2014 the
dam generated 98.8 terawatt-hours (TWh) and had the world record, but was
surpassed by Itaipú Dam that set the new world record in 2016 producing
103.1 TWh.[4]

20. The Itaipu Dam (Portuguese: Barragem de Itaipu, Spanish: Represa de
Itaipú; Portuguese pronunciation: [itɐjˈpu], locally [ita.iˈpu], Spanish
pronunciation: [itaiˈpu]) is a hydroelectric dam on the Paraná River located on the
border between Brazil and Paraguay. The construction of the dam was first
contested by Argentina, but the negotiations and resolution of the dispute ended up
setting the basis for Argentine-Brazilian integration later on.[3]
The name "Itaipu" was taken from an isle that existed near the construction site. In
the Guarani language, Itaipu means "the sounding stone".[4] The Itaipu Dam's
hydroelectric power plant produced the most energy of any in the world as of 2016,
setting a new world record of 103,098,366 megawatt hours (MWh),

21. The Koyna Hydroelectric Project is the largest completed hydroelectric power
plant in India.[1] It is a complex project with four damsincluding the largest dam
on the Koyna River, Maharashtra hence the name Koyna Hydroelectric Project.
The project site is in Satara districtnear Patan.
The Deshmukhwadi village on which koyna dam is situated is migrated on hill
station near to Koyna Dam.
The total capacity of the project is 1,960 MW.

22. -It is the highest dam in India & 8th highest dam in the world. -Tehri Dam is
located on the Bhagirathi River near Tehri in Uttarakhand, India. -It's a multi -
purpose rock and earth - fill embankment Dam. -It is the primary Dam of
the Tehri Hydro Development Corporation Ltd. & the Tehri Hydroelectric
Complex.
The Tehri Dam is the Highest dam in India and one of the highest in the world.
It is a multi-purpose rock and earth-fill embankment damon the Bhagirathi
River near Tehri in Uttarakhand, India. It is the primary dam of the THDC India
Ltd. and the Tehri hydroelectriccomplex. Phase 1 was completed in 2006, the
Tehri Dam withholds a reservoir for irrigation, municipal water supply and the
generation of 1,000 megawatts

26. Functional classification: storage, diversion, detention
(flood control)
Rigid
Embankment dam: non rigid material

27. Ad: Small, earth fill, cheaper, suitable for relative previous foundation, Blends with
natural surrounding, most permanent
Dis: Seepage losses
Suitable for spillway so need supplementary spillway, erosion

28. Fill dam : 2 Rock – Fill dam
•Trapezoidal,
•

29. Masonry Dam:
1: solid Gravity Dam
Massive , need sound rock foundation
Use spillways section
Can be on sand or gravel foundation if load is less
Water pressure is taken by weight of dam

32. An arch dam is a concrete dam that's curved upstream in plan. The arch dam is
designed so that the force of the water against it, known as hydrostatic pressure,
presses against the arch, compressing and strengthening the structure as it
pushes into its foundation or abutments.

33. Vajont Dam Collapse - Disasters of the Century
2000 died m
265 m high
270 million tonnes of water
30 million m3 of water
On 9 October 1963, during initial filling, a massive landslide caused a man-
made megatsunami in the lake in which 50 million cubic metres of water
overtopped the dam in a wave 250 metres (820 ft) high, leading to 1,910 deaths
and the complete destruction of several villages and towns.
The Vajont Dam (or Vaiont Dam)[2] is a disused dam, completed in 1959 in the
valley of the Vajont River under Monte Toc, in the municipality of Erto e Casso,
100 km (60 miles) north of Venice, Italy. One of the tallest dams in the world, it is
262 metres (860 ft) high, 27 metres (89 ft) wide and 22.11 metres (72 ft 6 in)
thick at the base and 191 metres (627 ft) wide and 3.4 metres (11 ft 2 in) thick at
the top.[3]

34. Longarone city before
Longarone city after

35. The Johnstown Flood (locally, the Great Flood of 1889)
occurred on May 31, 1889, after the catastrophic failure of the
South Fork Dam on the Little Conemaugh River 14 miles (23
km) upstream of the town of Johnstown, Pennsylvania. The
dam broke after several days of extremely
Johnstown, Pennsylvania : dam disaster: 2209 died
The Johnstown Flood (locally, the Great Flood of 1889) occurred on May 31,
1889, after the catastrophic failure of the South Fork Dam on the Little
Conemaugh River 14 miles (23 km) upstream of the town of Johnstown,
Pennsylvania. The dam broke after several days of extremely heavy rainfall,
releasing 14.55 million cubic meters of water.[4] With a volumetric flow rate that
temporarily equaled the average flow rate of the Mississippi River,[5] 2,209
people,[6] according to one account, lost their lives, and the flood accounted for
$17 million of damage (about $474 million in 2018 dollars[3]).
The American Red Cross, led by Clara Barton and with 50 volunteers, undertook
a major disaster relief effort.[7] Support for victims came from all over the United
States and 18 foreign countries. After the flood, survivors suffered a series of
legal defeats in their attempts to recover damages from the dam's owners. Public
indignation at that failure prompted the development in American law changing
a fault-based regime to strict liability.

36. A contemporary rendition of the scene at the Stone Bridge (1890)

37. China : Banqiao Dam Disaster: 117 meter : 260000 immediate dead
1975 year
Type : earth filled dam
Capacity 500,000,000 m3
The worst dam disaster in history: Banqiao Dam, Henan Province, China, 1975.
Immediate casualties, 26,000. Eventual casualties exceeded 100,000. This is a
physics-based computer simulation of the dam break and flood.

38. In the world's record of disasters due to human technical
failures, the 1975 collapse of China's Banqiao reservoir
dam in Henan province ranked first, which is higher than
the Chernobyl disaster in the former Soviet Union. In a
matter of days, 26 dams
collapsed one after another, which resulted in
massive flooding in nine counties and one town. More than
100,000 corpses were retrieved when the flooding
receded. Deaths due to the repercussions of grain
shortages and infectious diseases amounted to 140,000;
while the total number of deaths recorded was 240,000.
This death toll was comparable to the China's Tangshan
earthquake in the following year, and the damage dealt
was worse than the collapse of Egypt's Aswan reservoir
dam.

39. The St. Francis Dam was a curved concrete gravity dam, built to
create a large regulating and storage reservoir for the city of Los Angeles,
California. The reservoir was an integral part of the city's Los Angeles
Aqueduct water supply infrastructure. It was located in San Francisquito
Canyon
Gravity dam
At 11:57 p.m. on March 12, 1928, the dam catastrophically failed, and the
resulting flood took the lives of what is estimated to be at least 431
people.[2][3] The collapse of the St. Francis Dam is considered to be one of the
worst American civil engineering disasters of the 20th century and remains the
second-greatest loss of life in California's history, after the 1906 San Francisco
earthquake and fire. The disaster marked the end of Mulholland's career

40. The St. Francis Dam was a curved concrete gravity dam, built to create a large
regulating and storage reservoir for the city of Los Angeles, California. The
reservoir was an integral part of the city's Los Angeles Aqueduct water supply
infrastructure. It was located in San Francisquito Canyon of the Sierra Pelona
Mountains, about 40 miles (64 km) northwest of downtown Los Angeles, and
approximately 10 miles (16 km) north of the present day city of Santa Clarita.
The dam was designed and built between 1924 and 1926 by the Los Angeles
Department of Water and Power, then named the Bureau of Water Works and
Supply. The department was under the direction of its General Manager and Chief
Engineer, William Mulholland.

41. Teton Dam Disaster:us
The Teton Dam was an earthen dam on the Teton River in Idaho, United States.
It was built by the Bureau of Reclamation, one of eight federal
agencies authorized to construct dams.[3] Located in the eastern part of the state,
between Fremont and Madison counties, it suffered a catastrophic failure on
June 5, 1976, as it was filling for the first time.
The collapse of the dam resulted in the deaths of 11 people[4] and 13,000 cattle.
The dam cost about $100 million to build and the federal government paid over
$300 million in claims related to its failure. Total damage estimates have ranged
up to $2 billion.[5] The dam has not been rebuilt.

42. India dam collapse :1000 dead
Tigra Dam (also spelled "Tig Dam") creates a freshwater reservoir on the Sank
River, about 23 km from Gwalior, Madhya Pradesh, India[1] It plays a
crucial role in supplying water to the city.
View from the Dam
right side view
The dam is 24 metres high at its crest, and 1341 m long. The reservoir has a
capacity of 4.8 million cubic metres and the spillway structure can pass up to
1274 cubic metres per second.[2] A dam constructed on this site in 1915 failed on
the afternoon of 19 August 1917, due to infiltration into its sandstone foundations.
About 10,000 people were killed downstream.[3]

43. 1979 Machchhu dam failure
Jump to navigationJump to searchMorbi Dam FailureFailed earthen embankment
of Machchhu II dam
LocationMorbi and villages of Rajkot district, Gujarat, IndiaDeath(s)1800-25000
(estimated)[1]
Wikimedia | © OpenStreetMap
Location of Machhu dam and Morbi
The Machchhu dam failure or Morbi disaster was a dam-related flood disaster
which occurred on 11 August 1979, in India. The Machchu-2 dam, situated on the
Machhu river, burst, sending a wall of water through the town of Morbi (now in
the Morbi district of Gujarat, India.[2] Estimates of the number of people killed vary
greatly ranging from 1800 to 25000 people.[1][3][4] This dam was built near Rajkot in
Gujarat, India, on River Machhu in August, 1972, as a composite structure. It
consisted of a masonry spillway in river section and earthen embankments on both
side

44. The 2018 Laos dam collapse was the collapse of Saddle Dam D, part of a
larger hydroelectric dam system under construction in
southeast Laos's Champasak Province, on 23 July 2018. The dam collapse lead
to widespread destruction and homelessness among the local population in
neighbouring Attapeu Province. As of 25 September, 40 people were confirmed
dead,[3] at least 98 more were missing (maybe as much as 1,100 more people),
and 6,600 others were displaced saddle dam

45. Brazil dam collapse: 300 missing, 40 confirmed dead: Jan 2019

46. Second World War: Germany Dam burst by British forces killing 1500 people
The dam (51.489307°N 8.058772°E) was breached
by RAF Lancaster Bombers (“The Dambusters”) during Operation
Chastise on the night of 16–17 May 1943, together with the Edersee dam in
northern Hesse. Bouncing bombs had been constructed which were able
to skip over the protective nets that hung in the water. A huge hole of 77 m by
22 m was blown into the dam. The resulting huge floodwave killed at least
1,579 people,[1] 1,026 of them foreign forced labourers held in camps
downriver. The small city of Neheim-Hüsten was particularly hard-hit with over
800 victims, among them at least 526 victims in a camp for Russian women
held for forced labour.

47. Arch Dam: Small cross section, depends on availability of such site
•Requires narrow Valley with step slopes
•Few sites are suitable for such dam
•More force in small area
•Necessary to have separate spillways
•Overflow spillways are not used due to too
step

49. •Has inclined upstream face
•This force is transmitted by row of buttresses
•Required less 1/3 of concrete
•But extra cost of reinforcing steel and
framework need ,
•skilled workers

50. Type of spillways

55. Side channel spill ways

58. Shaft spillway

63. Simple or open surge tank Cylindrical/conical
Directly connected,
Accelerating and retarding heads
induced by the change of water surface
so sluggish
Small oscillations, large costly

64. •Restricted orifice surge tank
•Due to restriction rapidly accelerating and
retarding heads are produced.
•Design of governing mechanism
complicated and costly
•Due to that this type is not used, though
size is less than open type

65. Deferential Surge tank
•Combination of both,
•Diameter of internals riser connecting
penstock is less
•Riser having port at bottom
•When load decreases water rises in internal
riser and then spill over into tank
•Spilling water from internal riser to tank
creates differential head on the port
•Due to this water forces from turbine to tank
•When load decreases water from riser decreases rapidly , this create
accelerating head
•Differential surge tank acts rapidly like a throttled surge tank but the pressure rise
is not so rapid as in case of simple surge tank

67. 30
30 to 100
More than 100
•Pumped storage
•Mini/micro

68. •Depends on river capacity,
•no control on availably of water
•Power output fluctuates
•Less utility compare to others
Run off river plants without pondage

69. Run off river without pontage

70. Run-off river with pondage
•Pond behind river
•Pondage capacity calculated depends on 24 hours load
•Can be base or peak load
•Used where 12 month flow of river, Europe

71. Storage type of power plant
•Where rainfall in initial few month
•Large amount of water is stored in reservoir

72. Pumped storage peak load plant With thermal
•Reversible pump
turbine
•Less water as
circulated, additional
due to evaporation
Tehri Pumped
Storage Power
StationIndia1,000
The Sardar
Sarovar Dam
On June 2014,
Narmada Control
Authority gave the
final clearance to
raise the height from
121.92 m (400.0 ft)
metres to 138.68 m
(455.0 ft)[17]

73. Mini and micro power plant
Micro hydro is a type of hydroelectric power that typically produces from 5 kW to
100 kW of electricity using the natural flow of water. Installations below 5 kW are
called pico hydro.[1] These installations can provide power to an isolated home or
small community, or are sometimes connected to electric power networks,
particularly where net metering is offered
Mini 5 to 20 m
head
20000 kw
estimate india
Bulb type turbine
Micro less than
5 m
Instead of draft
tube straight
tube is used

74. Name Operator Configuration
Nathpa Jhakri (6
Turbinesx25 MW)
Satluj Jal Vidyut
Nigam
1500 MW
Sardar Sarovar
Dam,
Sardar Sarovar
Narmada Nigam
Ltd
1450 MW
Bhakra Nangal
Dam (Gobind
Sagar)
Bhakra Beas
Management Board
1325 MW
Chamera I NHPC Limited 1071 MW

75. Comparison of hydro power plant with gas and diesel power plant:
Particular Steam Hydro Gas diesel
Site Near load, cheap
land , water supply
,transport
Huge water, land,
bearing capacity,
away from load
center
Can be
anywhere
Can be
anywhere
Cost Low High Low low
Fuel High Nil Medium Medium
Operating cost High Very less Higher
than
steam
Very high
Maintenance Higher Low Medium Low
Space High Very high Low Low
Cooling water Very high Nil Low Medium
Trans, distri Low Very high Very high Very low
Reliability Less reliable Reliable Less
reliable
Less
reliable
Pollution High Nil Less Medium
Time of
installation
High Very high Low Low

76. Classification and selection of hydraulic turbine:
Head based
turbine
Head Discharge Type of turbine
Low head 2 – 15 m High Kaplan
Medium head 16-70 m High or medium Kaplan / Francis
High head 71-500 m Medium or low Francis or Pelton
Very high head Above 500 m Low Pelton
According to specific speed Ns= [N*(P)^(0.5) ] / (H)^(5/4)
Specific
speed
Pelton Francis Kaplan
Low 5-15 60-150 300-450
Medium 16-30 151-250 451-700
High 31-70 251-400 701-1100

77. Size of Hydraulic turbine
Type Maximum
head
Maximum
power MW
Maximum
runner m
Specific
speed Ns
Pelton 300-2000 250 5.5 4-70
Francis 30-500 720 10.0 60-400
Kaplan 2-70 225 10 300-1100
N= 120 f / p
N= specific speed
F = frequency
P= number of poles

79. Efficiency:
Input power pi = wQH / 1000
Mechanical efficiency = shaft power / input power = Ps / Pi
Generator efficiency = ng = Electrical power output P0 / input shaft power
Over all efficiency = electrical power Po / Input Power Pi
Over all efficiency = Mechanical efficiency * Generator efficiency

80. Country China
Location Sandouping, Yiling, Hubei
Construction began December 14, 1994
Opening date 2003
[1]
Construction cost ¥180 billion (US$27.6 billion)
Height 181 m (594 ft)
Length 2,335 m (7,661 ft)
Width (crest) 40 m (131 ft)
Width (base) 115 m (377 ft)
Spillway capacity 116,000 m
3
/s (4,100,000 cu ft/s)
Catchment area 1,000,000 km
2
(390,000 sq mi)
Hydraulic head Rated: 80.6 m (264 ft)
Maximum: 113 m (371 ft)
[2]
Turbines 32 × 700 MW
2 × 50 MW Francis-type
Installed capacity 22,500 MW
Capacity factor 45%
Annual generation 87 TWh (310 PJ) (2015)

81. Q. The average rate of inflow during 12 months for a river are as under
Month Inflow q
(m3/s)
Month Inflow q
(m3/s)
Month Inflow q
(m3/s)
Jan 800 May 600 Sept 1200
Feb 1000 June 1200 Oct 600
Mar 600 July 2400 Nov 600
Apr 400 August 2400 Dec 1000
Plot the hydrograph and determine the following
i) average flow
ii) power developed under a head of 160 m. if overall efficiency is 80 %.
iii) capacity of storage required for one year.
Neglect losses due to evaporation, seepage etc. assume each month 30
days.

82. Q. Draw the hydrograph if the average inflow rate of a river are as follows
Month Inflow q
(m3/s)
Month Inflow q
(m3/s)
Month Inflow q
(m3/s)
Jan 1600 May 800 Sept 1600
Feb 1200 June 1200 Oct 800
Mar 800 July 3000 Nov 800
Apr 800 August 3000 Dec 1000
Determine the storage capacity for a constant demand of 1100 m3/s . Also find
the number of additional month , this storage capacity can be utilized if there is
no rain fall.

83. Q. Draw the flow duration curve and mass curve if the average inflow rate of a
river are as follows
Month Inflow q
(m3/s)
Month Inflow q
(m3/s)
Month Inflow q
(m3/s)
Jan 1600 May 800 Sept 1600
Feb 1200 June 1200 Oct 800
Mar 800 July 3000 Nov 800
Apr 800 August 3000 Dec 1000
From mass curve determine the storage capacity for a constant demand of
1100 m3/s .

84. Q. A pelton wheel of 3 m runner works under a head of
800 m. it runs at 60 rpm. The discharge rate in to runner
is 3 m3/s. find i) input power to runner ii) shaft power
from runner having mechanical efficiency of 92 %. Iii) net
power output if generated is 96 % efficient iv) specific
speed of turbine v) no of turbines needed to generate 100
MW.

85. Thanks