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HYDROLOGY & SITE SELECTION OF
HYDRO POWER PLANT
Paramjeet Singh Jamwal
M.Tech 1st Semester
(Instrumentation & Control Engineering)
Sant Longowal Institute of Engineering & Technology
Longowal, Punjab
HYDROLOGY
•
•
•
•
•
•

Introduction
The hydrologic cycle
Measurement of run-off
Hydrograph
Flow duration curve
Mass curve
INTRODUCTION
• It is the science which deals with the depletion and
replenishment of water resources.
• It deals with the surface water as well as the ground
water.
• It is also concerned with the transportation of water from
on place to another.
• It helps us in determining the occurrence and availability
of water.
THE HYDROLOGIC CYCLE
• Most of the earth’s water sources, such as
rivers, lakes, oceans and underground sources etc get
their supply from rains (By Precipitation), while the rain
water itself is the evaporation from these sources.
• This evaporation and precipitation continues forever and
process is known as hydrologic cycle.
P=R+E
P-Precipitation
R-Run-Off
E-Evaporation
Hydrology & Site Selection of Hydro Power Plant
MEASUREMENT OF RUN-OFF
• Run-off can be measured daily, monthly, seasonal or yearly.
• It can be measured by the following methods1. From rainfall records
Run-off over the catchment = rainfall x coefficient

2. Empirical formulae
a)

Khosla’s formula
R = P - 4.811 T
R-Annual run-off in mm
P-Annual rainfall in mm
T-mean temperature in ˚C

b)

Inglis formula for areas of Maharashtra
For ghat region
R = 0.88 P – 304.8
For plain region
R = (P-177.8) x P / 2540
MEASUREMENT OF RUN-OFF
c) Lacey’s formula
R = P / (1 + 3084 F / PS)
R = monsoon run-off in mm
S = catchment area factor
F = monsoon duration factor
P = monsoon rainfall in mm
Value of S is minimum for flat places (0.25) and is maximum for
very hilly places (3.45)
F = 0.5 for very short monsoon
F = 1.0 for standard length monsoon
F = 1.5 for very long monsoon
MEASUREMENT OF RUN-OFF
3. Run-off curves and tables
•

•

Each region has its own catchment area and rainfall
characteristics and for the same region the characteristics
mostly remain unchanged. Based on this fact the run-off
coefficients are derived once for all.
Then a graph is plotted in which one axis represents
rainfall and the other run-off. The curves obtained are called
run-off curves.

4. Discharge observation method
•

To find out the sub-surface run-off it is essential to separate
the subsurface flow from the total flow. The separation can
be on an approximate basis but with correct analysis.
HYDROGRAPH
• It is defined as a graph showing discharge of flowing
water with respect to time for a specified time.
• Hydrograph of stream of river will depend on the
characteristics of the catchment and precipitation over
the catchment.
• It will access the flood flow of rivers hence it is essential
that anticipated hydrograph could be drawn for river for a
given storm.
• It indicates the power available from the stream at
different times of day, week, month or year.
THE UNIT HYDROGRAPH
• A unit hydrograph represents unit run-off resulted from
an intense rainfall of unit duration and specific areal
distribution.
• Introduction of unit hydrograph theory in 1932 made it
possible to predict a run-off hydrograph corresponding to
an hypothetical storm.
• The basic concept of unit hydrograph is that the
hydrographs of run-off from two identical storms would
be the same. In practice identical storms occur very
rarely. This makes it necessary to construct a typical
hydrograph.
For any catchment unit hydrograph can be prepared once then
whenever peak flow is to be find out, multiply the maximum ordinate of
unit hydrograph by the run-off value expressed in cm.
LIMITATIONS TO THE USE OF UNIT
HYDROGRAPHS
• Its use is limited to area about 5000 sq. kilometers since
similar rainfall distribution over a large area from storm to
storm is rarely possible.
• The odd shaped basins have very uneven rainfall
distribution, therefore, unit hydrograph method is not
adopted to such basins.
FLOW DURATION CURVE
• This curve is plotted between flow available during
period versus the fraction of time.
• If the magnitude on the ordinate is the potential power
contained in the stream flow, then the curve is known as
“power duration curve”.
• The flow duration curve is drawn with the help of a
hydrograph from the available run-off data and here it is
necessary to find out the length of time duration which
certain flow are available.
• The area under the flow duration curve gives the total
quantity of run-off during that period.
Steep slope throughout –
it indicates a stream with highly
variable discharge (flow is
mainly from surface run-off)
A flat slope –
it indicates small variability
(streams receiving both surfacerunoff and ground water run-off)
Flow Duration Curve
A flow duration curve plotted on a
log-log paper provides a qualitative
description of the run-off variability in
the stream.

Flat portion at the lower end – it
indicates substantial contribution
from ground water run-off.
FLOW DURATION CURVE
• If the head of discharge is known, the possible power
developed from water in kW
Power (kW) = ( wQH/1000) n₀
Q-Discharge, m3 /sec
H-Head available, m
W-weight density of water, N/m3
n₀-Overall efficiency
• Thus the flow duration curve can be converted to a power
duration with some other scale on the same graph.
• Flow duration curves are most useful for preliminary studies
and for comparison between streams.
USE OF FLOW DURATION CURVE
1. A flow duration curve allows the evaluation of low level
flows.
2. For hydropower studies, the flow duration curve serves
to determine the potential for firm power generation.
The firm power is also known as the primary power.
Secondary power is the power generated at the plant
utilising water other than that used for the generation of
firm power.
3. The flow duration curve also finds use in the design of
drainage systems and in flood control studies.
SHORTCOMINGS OF FLOW DURATION
CURVE
• Not present the flows in natural source of occurrence.
• Not possible to tell from flow duration curve whether the
lowest flow occurred in consecutive periods or were
scattered throughout the considered period.
MASS CURVE

A mass curve is the graph of the
cumulative values of
water
quantity against time.
An integral curve of the
hydrograph which expresses the
area under the hydrograph from
one time to another.
convenient device to determine
storage requirement that is
needed to produce a certain
dependable flow from fluctuating
discharge of a river by a
reservoir.
solve the reserve problem of
determining
the
maximum
demand rate that can be
maintained by a given storage
volume.
SITE SELECTION
1. Availability of water
– All other designs are based on it.
– Estimate should be made about the average quantity
of water available throughout the year and also
about maximum and minimum quantity of water
available during the year.
– These details are necessary to decide the capacity of
the hydropower plant, and
– It also provide adequate spillways or gate relief
during flood period.
SITE SELECTION
2. Water storage
– Since there a is wide variation in rainfall during the
year, therefore it is necessary to store the water for
continuous generation of power. The storage
capacity can be calculated with the help of mass
curve.
– The two types of storages in use are
1. The storage is so constructed that it can make water
available for power generation for one year only.
2. Water is available in sufficient quantity even during the
worst dry periods.
SITE SELECTION
3. Water head
– In order to generate a requisite quantity of power it is
necessary that a large quantity of water at sufficient
head should be available.
– An increase in effective head for a given
output, reduces the quantity of water required to be
supplied to the turbines.
SITE SELECTION
4. Accessibility of site
– The site where hydro-electric plant is to be
constructed should be easy accessible. This is
important if the electric power generated is to be
utilised at or near the plant site.
– The site selected should have transportation facilities
of rail and road.
SITE SELECTION
5. Distance from the load centre
– Power plant should be set up near the load
centre, this will reduce the cost of maintenance of
transmission line.
SITE SELECTION
6. Type of the land of the site
– The land to be selected for the site should be cheap and
rocky.
– The ideal site will be one where the dam will have largest
catchment area to store water at high head and will be
economical in construction.
– Necessary requirement of the foundation rocks for
masonry dam are•
•
•

The rock should be strong enough to withstand the stresses
transmitted from the dam structure as well as the thrust of the
water when the reservoir is full.
The rock in the foundation of the dam should be reasonably
impervious.
The rock should remain stable under all condtitions.
Thank You
For more
Information for Electrical & Electronics Engineering
visit info4eee.blogspot.com

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Hydrology & Site Selection of Hydro Power Plant

  • 1. HYDROLOGY & SITE SELECTION OF HYDRO POWER PLANT Paramjeet Singh Jamwal M.Tech 1st Semester (Instrumentation & Control Engineering) Sant Longowal Institute of Engineering & Technology Longowal, Punjab
  • 2. HYDROLOGY • • • • • • Introduction The hydrologic cycle Measurement of run-off Hydrograph Flow duration curve Mass curve
  • 3. INTRODUCTION • It is the science which deals with the depletion and replenishment of water resources. • It deals with the surface water as well as the ground water. • It is also concerned with the transportation of water from on place to another. • It helps us in determining the occurrence and availability of water.
  • 4. THE HYDROLOGIC CYCLE • Most of the earth’s water sources, such as rivers, lakes, oceans and underground sources etc get their supply from rains (By Precipitation), while the rain water itself is the evaporation from these sources. • This evaporation and precipitation continues forever and process is known as hydrologic cycle. P=R+E P-Precipitation R-Run-Off E-Evaporation
  • 6. MEASUREMENT OF RUN-OFF • Run-off can be measured daily, monthly, seasonal or yearly. • It can be measured by the following methods1. From rainfall records Run-off over the catchment = rainfall x coefficient 2. Empirical formulae a) Khosla’s formula R = P - 4.811 T R-Annual run-off in mm P-Annual rainfall in mm T-mean temperature in ˚C b) Inglis formula for areas of Maharashtra For ghat region R = 0.88 P – 304.8 For plain region R = (P-177.8) x P / 2540
  • 7. MEASUREMENT OF RUN-OFF c) Lacey’s formula R = P / (1 + 3084 F / PS) R = monsoon run-off in mm S = catchment area factor F = monsoon duration factor P = monsoon rainfall in mm Value of S is minimum for flat places (0.25) and is maximum for very hilly places (3.45) F = 0.5 for very short monsoon F = 1.0 for standard length monsoon F = 1.5 for very long monsoon
  • 8. MEASUREMENT OF RUN-OFF 3. Run-off curves and tables • • Each region has its own catchment area and rainfall characteristics and for the same region the characteristics mostly remain unchanged. Based on this fact the run-off coefficients are derived once for all. Then a graph is plotted in which one axis represents rainfall and the other run-off. The curves obtained are called run-off curves. 4. Discharge observation method • To find out the sub-surface run-off it is essential to separate the subsurface flow from the total flow. The separation can be on an approximate basis but with correct analysis.
  • 9. HYDROGRAPH • It is defined as a graph showing discharge of flowing water with respect to time for a specified time. • Hydrograph of stream of river will depend on the characteristics of the catchment and precipitation over the catchment. • It will access the flood flow of rivers hence it is essential that anticipated hydrograph could be drawn for river for a given storm. • It indicates the power available from the stream at different times of day, week, month or year.
  • 10. THE UNIT HYDROGRAPH • A unit hydrograph represents unit run-off resulted from an intense rainfall of unit duration and specific areal distribution. • Introduction of unit hydrograph theory in 1932 made it possible to predict a run-off hydrograph corresponding to an hypothetical storm. • The basic concept of unit hydrograph is that the hydrographs of run-off from two identical storms would be the same. In practice identical storms occur very rarely. This makes it necessary to construct a typical hydrograph.
  • 11. For any catchment unit hydrograph can be prepared once then whenever peak flow is to be find out, multiply the maximum ordinate of unit hydrograph by the run-off value expressed in cm.
  • 12. LIMITATIONS TO THE USE OF UNIT HYDROGRAPHS • Its use is limited to area about 5000 sq. kilometers since similar rainfall distribution over a large area from storm to storm is rarely possible. • The odd shaped basins have very uneven rainfall distribution, therefore, unit hydrograph method is not adopted to such basins.
  • 13. FLOW DURATION CURVE • This curve is plotted between flow available during period versus the fraction of time. • If the magnitude on the ordinate is the potential power contained in the stream flow, then the curve is known as “power duration curve”. • The flow duration curve is drawn with the help of a hydrograph from the available run-off data and here it is necessary to find out the length of time duration which certain flow are available. • The area under the flow duration curve gives the total quantity of run-off during that period.
  • 14. Steep slope throughout – it indicates a stream with highly variable discharge (flow is mainly from surface run-off) A flat slope – it indicates small variability (streams receiving both surfacerunoff and ground water run-off) Flow Duration Curve A flow duration curve plotted on a log-log paper provides a qualitative description of the run-off variability in the stream. Flat portion at the lower end – it indicates substantial contribution from ground water run-off.
  • 15. FLOW DURATION CURVE • If the head of discharge is known, the possible power developed from water in kW Power (kW) = ( wQH/1000) n₀ Q-Discharge, m3 /sec H-Head available, m W-weight density of water, N/m3 n₀-Overall efficiency • Thus the flow duration curve can be converted to a power duration with some other scale on the same graph. • Flow duration curves are most useful for preliminary studies and for comparison between streams.
  • 16. USE OF FLOW DURATION CURVE 1. A flow duration curve allows the evaluation of low level flows. 2. For hydropower studies, the flow duration curve serves to determine the potential for firm power generation. The firm power is also known as the primary power. Secondary power is the power generated at the plant utilising water other than that used for the generation of firm power. 3. The flow duration curve also finds use in the design of drainage systems and in flood control studies.
  • 17. SHORTCOMINGS OF FLOW DURATION CURVE • Not present the flows in natural source of occurrence. • Not possible to tell from flow duration curve whether the lowest flow occurred in consecutive periods or were scattered throughout the considered period.
  • 18. MASS CURVE A mass curve is the graph of the cumulative values of water quantity against time. An integral curve of the hydrograph which expresses the area under the hydrograph from one time to another. convenient device to determine storage requirement that is needed to produce a certain dependable flow from fluctuating discharge of a river by a reservoir. solve the reserve problem of determining the maximum demand rate that can be maintained by a given storage volume.
  • 19. SITE SELECTION 1. Availability of water – All other designs are based on it. – Estimate should be made about the average quantity of water available throughout the year and also about maximum and minimum quantity of water available during the year. – These details are necessary to decide the capacity of the hydropower plant, and – It also provide adequate spillways or gate relief during flood period.
  • 20. SITE SELECTION 2. Water storage – Since there a is wide variation in rainfall during the year, therefore it is necessary to store the water for continuous generation of power. The storage capacity can be calculated with the help of mass curve. – The two types of storages in use are 1. The storage is so constructed that it can make water available for power generation for one year only. 2. Water is available in sufficient quantity even during the worst dry periods.
  • 21. SITE SELECTION 3. Water head – In order to generate a requisite quantity of power it is necessary that a large quantity of water at sufficient head should be available. – An increase in effective head for a given output, reduces the quantity of water required to be supplied to the turbines.
  • 22. SITE SELECTION 4. Accessibility of site – The site where hydro-electric plant is to be constructed should be easy accessible. This is important if the electric power generated is to be utilised at or near the plant site. – The site selected should have transportation facilities of rail and road.
  • 23. SITE SELECTION 5. Distance from the load centre – Power plant should be set up near the load centre, this will reduce the cost of maintenance of transmission line.
  • 24. SITE SELECTION 6. Type of the land of the site – The land to be selected for the site should be cheap and rocky. – The ideal site will be one where the dam will have largest catchment area to store water at high head and will be economical in construction. – Necessary requirement of the foundation rocks for masonry dam are• • • The rock should be strong enough to withstand the stresses transmitted from the dam structure as well as the thrust of the water when the reservoir is full. The rock in the foundation of the dam should be reasonably impervious. The rock should remain stable under all condtitions.
  • 25. Thank You For more Information for Electrical & Electronics Engineering visit info4eee.blogspot.com