This document discusses hydrology and site selection considerations for hydro power plants. It begins with an introduction to hydrology, including definitions and the hydrologic cycle. It then discusses various methods to measure runoff, including empirical formulas, runoff curves, and direct discharge observations. Hydrographs and unit hydrographs are explained as tools to understand water flow over time. Flow duration curves and mass curves are also summarized as useful for assessing available water supply. The document concludes with key factors to consider for site selection, such as available water supply, water storage capacity, water head, accessibility, distance to load centers, and land characteristics.
This presentation includes introduction to run off river (ROR) plant and pumped storage plants, comparison between traditional and run off river plant, Classification of ROR Plants, Advantages and disadvantages of ROR Plants, Introduction to Pumped Storage Power (PSP) Plants, Classification of PSP, and Advantages and disadvantages of PSP
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Hydroelectric power plant classification of hydroelectric power plant , Different types of Hydroelectric power power plant in India factor considered in selection of hydroelectric power plant
This presentation includes introduction to run off river (ROR) plant and pumped storage plants, comparison between traditional and run off river plant, Classification of ROR Plants, Advantages and disadvantages of ROR Plants, Introduction to Pumped Storage Power (PSP) Plants, Classification of PSP, and Advantages and disadvantages of PSP
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Hydroelectric power plant classification of hydroelectric power plant , Different types of Hydroelectric power power plant in India factor considered in selection of hydroelectric power plant
A generating station in which diesel engine is used as the prime mover for the generation of electrical energy
is known as Diesel power station or Diesel power plant
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Hydrologic data generally consist of a sequence of observations of some phase of the hydrologic cycle made at a particular site. The data may be a record of the discharge of a stream at a particular place, or it may be a record of the amount of rainfall caught in a particular rain gage.
Although for most hydrologic purposes a long record is preferred to a short one, the user should recognize that the longer the record the greater the chance that there has been a change in the physical conditions of the basin or in the methods of data collection. If these are appreciable, the composite record would represent only a nonexistent condition and not one that existed either before or after the change. Such a record is inconsistent.
A generating station in which diesel engine is used as the prime mover for the generation of electrical energy
is known as Diesel power station or Diesel power plant
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Hydrologic data generally consist of a sequence of observations of some phase of the hydrologic cycle made at a particular site. The data may be a record of the discharge of a stream at a particular place, or it may be a record of the amount of rainfall caught in a particular rain gage.
Although for most hydrologic purposes a long record is preferred to a short one, the user should recognize that the longer the record the greater the chance that there has been a change in the physical conditions of the basin or in the methods of data collection. If these are appreciable, the composite record would represent only a nonexistent condition and not one that existed either before or after the change. Such a record is inconsistent.
Hydrology, Runoff methods & instruments, Site selectionRaveen Ramanan
Hydrology.
Runoff Defn, need, Factors affecting runoff.
Runoff measurement methods.
Runoff measuring instruments.
Factors considered for site analysis.
Case study.
References.
mesearment of stream flow channels in rivermulugeta48
STREAM FLOW:
is the quantity of water per unit time flowing across the section of the stream.
It is usually expressed as cubic meters per second
Streams may be classified as:
(i) Influent and Effluent streams
(ii) Intermittent and perennial streams
If the GWT is below the bed of the stream, the seepage from the stream feeds the ground-water resulting in the build up of water mound (Fig. 4.6).
Such streams are called influent streams
Irrigation channels function as influent streams and many rivers which cross desert areas do so.
Such streams will dry up completely in rainless period and are called ephemeral streams.
Streams may be classified as:
(i) Influent and Effluent streams
(ii) Intermittent and perennial streams
If the GWT is below the bed of the stream, the seepage from the stream feeds the ground-water resulting in the build up of water mound (Fig. 4.6).
Such streams are called influent streams
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Features:
View watershed boundary and drainage network, and contour map layers
Find area of a selected watershed
View ground profile along and across the stream path
View existing water conservation structures along with photo
Manage watershed structures
Add Water Conservation Structure
Change Status of Structure (Proposed, Under Progress, Completed)
Technology
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Google Elevation API
Google Fusion Tables (for polyline and polygon data)
ASP.NET, SQL Server 2008 (for point data)
A hydraulic structure may be defined as any structure which is designed to handle water in any way
This includes the retention, conveyance, control, regulation and dissipation of the energy of water
Such water handling structures are required in many fields of civil engineering
The principal ones being water supply and conservation, hydroelectric power, irrigation and drainage, navigation, flood control, fish, wildlife service’s and certain aspects of highway engineering. Various equations, based on continuity, energy, and momentum principles, may be used
To calculate the most suitable length, width, shape, elevation and orientation of the structure.
The application of these basic principles to the practical problem of the design of hydraulic structures is called hydraulic design
Designed and constructed for managing and utilizing water resources to the best advantage of the human being and environment
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Session Overview
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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
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
5.
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.