linear programming approach for optimal … · 2017-11-01 · this dam is located in the hidkal...
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International Journal of Civil Engineering and Technology (IJCIET) Volume 8, Issue 10, October 2017, pp. 1500–1512, Article ID: IJCIET_08_10_151
Available online at http://http://www.iaeme.com/ijciet/issues.asp?JType=IJCIET&VType=8&IType=10
ISSN Print: 0976-6308 and ISSN Online: 0976-6316
© IAEME Publication Scopus Indexed
LINEAR PROGRAMMING APPROACH FOR
OPTIMAL LAND AND WATER RESOURCE
ALLOCATION UNDER DIFFERENT
HYDROLOGICAL SCENARIOS
Shakuntala G. Vadde
Post Graduate Student, VTU, Belagavi, Karnataka, India
Shreedhar R
Associate Professor, GIT, Belagavi, Karnataka, India
Chandrashekarayya G. Hiremath
Assistant Professor, VTU, Belagavi, Karnataka, India
ABSTRACT
This study proposes application of Linear Programming Optimization technique
for the optimization of reservoir release followed by optimal allocation of land and
water resource for the maximization of net annual farm income from the study area.
The study is conducted in Ghataprabha Command area, a significant portion of
Krishna river basin situated in Northern part of Karnataka, India. Two distinct
scenarios have been considered in the study involving four different hydrological
years which is very essential for scheduling of irrigation water supply and better
management of existing water resource. Scenario-I representing average weather
condition whereas Scenario-II consists of different hydrological years such as dry, wet
and normal corresponding to probability of exceedence P80, P20 , P50 respectively. The
net benefit incurred from command area for Scenario-I was about 5740 Million
Rupees. The results of Scenario-II demonstrated that the net income for dry, wet and
normal years was 4201, 5912 and 5386 Million Rupees respectively.
Key words: Optimization, Linear Programming, Reservoir operation, optimal land
allocation.
Cite this Article: Shakuntala G. Vadde, Shreedhar R and Chandrashekarayya G.
Hiremath, Linear Programming Approach for Optimal Land and Water Resource
Allocation under different Hydrological Scenarios. International Journal of Civil
Engineering and Technology, 8(10), 2017, pp. 1500–1512.
http://www.iaeme.com/IJCIET/issues.asp?JType=IJCIET&VType=8&IType=10
Shakuntala G. Vadde, Shreedhar R and Chandrashekarayya G. Hiremath
http://www.iaeme.com/IJCIET/index.asp 1501 [email protected]
1. INTRODUCTION
Water is the fundamental and most vital resource for the existence of lives on the planet earth.
Since the water resources across the world are unevenly distributed both temporally and
spatially and inspite of plentiful water resources, numerous regions are facing the scarcity of
water [9].
The monetary advancement of a nation is specifically reliant on the accessibility of water
in view of its utilization in industrial supply, household agriculture and local usage. In order
to maintain the balance among ecosystem, environment, hydrological integrity and water
demand of the society there is serious need for efficient and sustainable water management
system. The hydraulic structures are designed and constructed to serve various objectives viz.
satisfying needs of domestic and industrial areas, irrigation, hydropower, flood protection,
fishery development navigation etc.[1].In Karnataka agribusiness consumes about 94% of
existing water resources because of uneven scanty and unreliable nature of rainfall. This
emphasizes a need for a well-planned and operated efficient water management system.
In order to accumulate the surplus water various Reservoirs have been built across the
country so as to use it as and when required to serve the various purposes. The conventional
practice of reservoir operation highly relies upon the experience and judgment of the
managers of reservoir system which vary from person to person founded on the empirical
methods. These practices will not assure of optimal operational decisions. In the current era
with the advancement in the science and technology and evolution of various computer
models have made it possible to assess the consequences of an operating decision well in
advance by simulation of river system and reservoir operation on real time basis [5]. Hence to
gain maximum benefit from the command areas, it is imperative to form an effective reservoir
release policy for optimal allocation of water to the fields in required quantity. Optimization
techniques emerging out to be an excellent tool for management of water resources being
used and implemented by various researchers across the world such as A. B.Mirajkar et
al.,(2016)[1],A. D. Teixeira et al., (2002) [2],S. Kumari et al.,(2015) [10].H. R. Safavi et al.,
(2017)[6] used Optimization for conjunctive use of surface water and Ground water.
Different mathematical programming techniques are available for optimization of
available land and water resources of which the Linear programming (LP) being the most
popular. U. Mandal et al., (2013)[11] applied LP technique for Hirakud canal command area
for maximizing the net benefit out of command area. Similar works were carried out by A.
Singh et al.,(2014)[3]and Sabouni et al., (2014)[7].S. Devi et al., (2005)[8] employed LP for
optimal water allocation in large river basin system of transboundary Subarnarekha River in
India. Similarly S.Kumari et al., (2015)[10], S. J. Pereira-Cardenal et al., (2015)[9],C.
Davidsen et al., (2015)[4] successfully used dynamic programming technique for
management of water resources.
This paper proposes a Linear Programming technique for optimizing monthly release from
the Hidkal reservoir. The releases so obtained used for optimal allocation of water and land
resources so as to maximize the net return from Ghataprabha command Area (GCA).
2. STUDY AREA
The proposed study is intended to propose a reservoir release policy for the Hidkal reservoir
which is presently the biggest dam in the Belagavi district of Karnataka, created across
Ghataprabha River. This dam is located in the Hidkal village of Hukkeri Taluka. It is having a
catchment area of 1412 sq.km, situated at a Latitude of 16° 09' 0" North & 74° 38' 0" East
Longitude. The salient features of the reservoir are as mentioned in the Table 1 below. The
Linear Programming Approach for Optimal Land and Water Resource Allocation under different
Hydrological Scenarios
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specific objective behind construction of this dam was to provide water for irrigation and
satisfy the needs of drinking water and Hydropower. The Ghataprabha command area which
is currently spread over an area about 3 lakh Ha comprising seven talukas of Belagavi district
(Athani, Chikkodi, Gokak, Hukkeri, Raibag, Ramdurg, Savadatti) and six talukas of Bagalkot
district (Badami, Bagalkot, Bilgi, Hungund, Jamkhandi and Mudhol). The command area
receives an average annual rainfall of 553.8 mm. The temperature in the area varies from a
maximum of 40oC to 20
oC.
Table 1 Salient features of Hidkal Dam
SALIENT FEATURES OF HIDKAL DAM
1 Location Hidkal
2 Taluka , District Hukkeri, Belagavi
3 Type of Dam Composite
4 Height of Dam 53.35 m
5 FRL / MWL 662.9 m
6 Reservoir Storage Capacity
(i)Gross Storage Capacity 1443 Mm3
(ii) Live Storage Capacity 1388 Mm3
(iii) Dead Storage Capacity 57 Mm3
7 Canals
Length G.R.B.C. 202 km
G.L.B.C. 109 km
8 Irrigated area
G.R.B.C. 155559 Ha
G.L.B.C. 161871 Ha
9
Power Generation Capacity
(Two units) each 16MW
32 MW
Figure 1 Location map of study area.
The most crucial part of operations is the arrival of right quantity of water at the perfect
time to water system zones. This study uses the Linear programming approach for the
optimization of monthly release from the Hidkal Reservoir. The present cropping pattern in
the study area is given in Table 2 below.
Shakuntala G. Vadde, Shreedhar R and Chandrashekarayya G. Hiremath
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Table 2 Existing cropping pattern in the command area
Season Crop Area in
Hectares
Percentage
Area
Kharif
Groundnut 34721 25%
Hybrid maize 52081 37.50%
Hybrid jowar 24305 17.50%
Local jowar 10416 7.50%
Millet 17360 12.50%
Total 138883
Rabi
Local jowar 32019 25%
Hybrid maize 16010 12.50%
Pulses 16010 12.50%
Sunflower 16010 12.50%
Wheat 48029 37.50%
Total 128078
Two
Seasonal
Sugarcane 32020 50%
Cotton 32019 50%
Total 64039
3. MATERIAL AND METHODOLOGY
Linear Programming is an optimization technique widely used by water resource engineers
for maximizing the net revenue from the command area. The excel solver tool has been used
for optimizing the monthly release from the reservoir followed by optimizing the cropping
pattern for the associated command area.
3.1. Reservoir Operation
The proposed study aimed at the formation of optimal monthly release for the Hidkal
reservoir analyzing the monthly demands of the crops in the GCA, flow data and evaporation
loss data of past 30 years. The analysis has been done for different Hydrological scenarios.
• Scenario (I): This criterion involves formation of monthly reservoir releases for average
condition by using mean monthly inflow and evaporation data of past 30 years.
• Scenario (II): Past 30 years mean monthly inflow and evaporation data and irrigation
demandof crops have been processed to form reservoir operation policies for three
hydrological scenarios namely Dry, Wet and Normal corresponding to probability of
exceedence of P80, P20 ,P50 respectively.
It involves calculation of Inflow, evaporation and monthly crop demand values at 80%,
50% and 20% probability.
Pi dry = Pi avg * (P dry / P avg) (1)
Where Pi avg = Average monthly Inflow for month ; Pi dry= monthly Inflow dry year for
month I;P avg = Average yearly Inflow and P dry = yearly Inflow at 80% probability of
exceedence
Similarly the monthly Inflow values for normal and wet year are calculated. The same
procedure has to be followed for processing of Evaporation and irrigation water demand of
crops into dry, wet and normal scenarios.
The system of reservoir is as shown in the Fig. 2. It consists of four major components
viz. inflow, storage, evaporation and outflow which largely influence the functioning and
Linear Programming Approach for Optimal Land and Water Resource Allocation under different
Hydrological Scenarios
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effective operation of any reservoir. During storms, the runoff gets stored in reservoirs and a
part of stored water might be lost as evaporation. The stored water is released as and when
required. Such releases from the reservoir system need to be optimized.
Figure 2 System of Reservoir
3.2. Objective Function
The objective function of the model is to maximize the monthly release from the reservoir
which can be given as
Max Z= ∑Rt (2)
It is subjected to constraints
St+1 =St+ Qt – Et –Rt - Ot (3)
It implies that the end of year storage is equal to the beginning of the next year’s storage.
Rt ≤ Dt (4)
The monthly releases of water should be less than or equal to the irrigation demand from
the command area.
St ≤ K (5)
The storage should be less than or equal to the live storage capacity of the reservoir
Rt≥ 0 (6)
St ≥ 0 (7)
Equations (6) and (7) are the non-negativity constraints
Where
Rt= Releases in Mm3, Qt = Inflows in Mm
3, Et = Evaporation loss in Mm
3, Ot= Spill loss in
Mm3,
St = Storage at a given time t in Mm3, K= Live storage capacity of reservoir in Mm
3
3.3. Optimization of cropping pattern
The objective function is to maximize the net benefit from the command area by optimal
allocation of water and land resources.
Shakuntala G. Vadde, Shreedhar R and Chandrashekarayya G. Hiremath
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Max Z = Σ yi(Ri – Ci) * Ai (8)
Where
yi=Yield in Qtl/ Ha
Ri=Revenue in Rs/Qtl
Ci=Production Cost in Rs/Qtl
Subjected to the Constraint
(1)Kharif Water Availability
Σ Ai*IRi≤ ΣR1-4 (9)
(2)Rabi water availability
Σ Ai*IRi≤ ΣR5-10 (10)
(3)Water Availability for Sugarcane
A11*IR11≤ ΣR1-12 (11)
(4)Water availability for Cotton
A12*IR12 ≤ ΣR4-10 (12)
(5) Total Water Availability
Σ GIRi Ai ≤ Σ Ri (13)
(6)Kharif Land Availability
Σ A1-5 ≤ LAK (138883 Ha) (14)
(7) Rabi Land Availability
Σ A6-10 ≤ LAR (128078 Ha) (15)
(8) Seasonal Crops land availability
Σ A1-12 ≤ LAS (64039 Ha) (16)
Where
LAK = Land Availability for Kharif crops from existing cropping pattern.
LAR = Land Availability for Rabi crops from existing cropping pattern.
LAS = Land Availability for Two seasonal crops from existing cropping pattern.
Table 3 Designation of crops in GCA.
Season
Crop
Area
designation
Irrigation
Requirement
designation
Kharif
1.Groundnut A1 IR1
2. Hybrid Maize A2 IR2
3. Hybrid Jowar A3 IR3
4.Local jowar A4 IR4
5.Millet A5
IR5
Rabi
6.Local jowar A6 IR6
7. Hybrid maize A7 IR7
8.Pulses A8 IR8
9.Sunflower A9 IR9
10.wheat A10
IR10
Two Seasonal
11.Sugarcane A11 IR11
12.Cotton A12 IR12
Linear Programming Approach for Optimal Land and Water Resource Allocation under different
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Table 4 Monthly Release designation from reservoir.
4. RESULTS AND DISCUSSION
4.1. Reservoir Operation
The releases for different scenarios are as shown in Table5.The objective function was set to
maximize the monthly release from the Hidkal reservoir. The monthly releases are highest
during dry years (Probability of exceedence P80) and lowest during wet years. The releases for
average scenario are well approached by that in normal scenario.
Table 5 Releases for different Scenarios
Month
Releases
for different Scenarios in (Mm3)
Average Dry Normal Wet
May 49.13 50.23 49.51 48.12
June 122.30 130.86 124.47 113.05
July 278.61 288.36 280.54 266.19
Aug 195.43 215.23 199.97 172.38
Sept 107.82 145.48 120.53 76.34
Oct 361.99 390.12 385.38 333.49
Nov 129.48 136.62 134.32 121.70
Dec 369.57 259.14 371.49 366.85
Jan 464.00 0.00 270.85 463.35
Feb 30.93 0.00 0.00 192.99
Mar 0.00 0.00 0.00 0.00
Apr 0.00 0.00 0.00 0.00
4.2. Optimal Allocation of Area and water resource
LP model has been employed to gain most promising net benefit from the Ghataprabha
command area by optimal allocation of area and water resource in the vicinity of command
area. The existing cropping pattern in the command area is as shown in the Table 2. The land
availability constraint was employed for Kharif, Rabi and seasonal crops from the existing
cropping pattern. The water availability constraint was set depending upon water demand for
each crop in the command area during its growing period.The optimal results for irrigated
land allocated to each crop and net benefit gained under each scenario are explained as
follows.
Month
Release
Designation
May R1
June R2
July R3
August R4
September R5
October R6
November R7
December R8
January R9
February R10
March R11
April R12
Shakuntala G. Vadde, Shreedhar R and Chandrashekarayya G. Hiremath
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*Average Scenario: The global optimal solution under average scenario for maximum benefit
is as shown in Fig. 3. The LP model has allocated 25%, 46.87%, 13.13%, 5.62% and 9.37%
of actual irrigated land to Groundnut, Hybrid Maize, Hybrid Jowar, Local Jowar and Millet
respectively during Kharif season. Similarly during Rabi season optimization model has
allocated 23.32%, 15.63%, 15.63%, 9.38% and 28.12% of the actual irrigated land to local
Jowar, Hybrid Maize, Pulses, Sunflower and wheat respectively. The unirrigated land during
Rabi season is around 7.93% of actual irrigated land. Two seasonal crops namely Sugarcane
and cotton have been allocated an area of 9.37% and 62.5% respectively.
Figure 3 Optimal Area allocation for Average Scenario
Out of total water availability of 2109.25 Mm3during average scenario, nearly 6.43%,
19.85% of water is allocated to sugarcane and cotton respectively as shown in Fig. 4 below.
Kharif and Rabi crops have got a share of 28.13% and 45.59% respectively. The maximum
net benefit for the average scenario is 5740 Million Rupees as shown in Table 6.
Figure 4 Optimal water allocation for Average Scenario
* Dry Scenario: The global optimal solution under dry scenario for maximum benefit is as
shown in Fig. 5. The LP model has allocated 17.5%, 37.41%, 12.25%, 5.25% and 8.75% of
actual irrigated land to Groundnut, Hybrid Maize, Hybrid Jowar, Local Jowar and Millet
593.41
961.51
135.68
418.65
0.00 200.00 400.00 600.00 800.00 1000.00 1200.00
Kharif
Rabi
Sugarcane
Cotton
Optimal water Allocation in Million cubic meter
Optimal water allocation for Average Scenario
347.2
651.0
182.3
78.1
130.2
298.6
200.1
200.1
120.1
360.2
60.0
400.2
0 200 400 600 800
GroundnutHy maizeHy jowar
Local jowarMillet
Local jowarHy maize
PulsesSunflower
WheatSugarcane
Cotton
Optimal Area of crop in Million sq.mts
Cro
ps
Optimal Area allocation for Average Scenario
Linear Programming Approach for Optimal Land and Water Resource Allocation under different
Hydrological Scenarios
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respectively during Kharif season. Similarly during Rabi season optimization model has
allocated 17.5%, 8.75%, 8.75%, 8.75% and 26.25% of the actual irrigated land to local Jowar,
Hybrid Maize, Pulses, Sunflower and wheat respectively. The unirrigated land during Kharif
and Rabi seasons found to be 18.83% and 30% of actual irrigated land respectively. Two
seasonal crops namely Sugarcane and cotton have been allocated an area of 4.68% and
39.04% respectively.
Figure 5 Optimal Area allocation for Dry Scenario
Out of total water availability of 1616.04 Mm3
during dry scenario 4.4%, 16.48% of water
is allocated to sugarcane and cotton respectively as shown in the Fig. 6 below. Kharif and
Rabi crops have got a share of 33.22% and 45.9% respectively. The maximum net benefit for
the average scenario is 4201 Million Rupees as shown in Table 6.
Figure 6 Optimal water allocation for Dry Scenario
*Wet Scenario: The global optimal solution under wet scenario for maximum benefit is as
shown in Fig. 7. The LP model has allocated 25%, 46.87%, 13.13%, 5.62% and 9.37% of
actual irrigated land to Groundnut, Hybrid Maize, Hybrid Jowar, Local Jowar and Millet
respectively during Kharif season. Similarly during Rabi season optimization model has
allocated 29.07%, 15.63%, 15.63%, 9.38% and 28.12% of the actual irrigated land to local
Jowar, Hybrid Maize, Pulses, Sunflower and wheat respectively. The unirrigated land during
243.0
519.6
170.1
72.9
121.5
224.1
112.1
112.1
112.1
336.2
30.0
250.0
0.0 100.0 200.0 300.0 400.0 500.0 600.0
Groundnut
Hy jowar
Millet
Hy maize
Sunflower
Sugarcane
Optimal Area of crop in Million sq.mts
Cro
p
Optimal Area allocation for Dry Scenario
536.82
741.80
71.06
266.35
0.00 200.00 400.00 600.00 800.00
Kharif
Rabi
Sugarcane
Cotton
Optimal water Allocation in Million cubic meter
Optimal water allocation for Dry Scenario
Shakuntala G. Vadde, Shreedhar R and Chandrashekarayya G. Hiremath
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Rabi season is around 2.17% of actual irrigated land. Two seasonal crops namely Sugarcane
and cotton have been allocated an area of 15.62% and 62.5% respectively.
Figure 7 Optimal Area allocation for Wet Scenario
Out of total water availability of 2154.47 Mm3during wet scenario, nearly 9.89%, 19.09% of
water is allocated to sugarcane and cotton respectively as shown in Fig. 8. Kharif and Rabi
crops have got a share of 28.84% and 45.18% respectively. The maximum net benefit for the
average scenario is 5912 Million Rupees as shown in Table 6.
Figure 8 Optimal water allocation for Wet Scenario
*Normal Scenario: The global optimal solution under normal scenario for maximum benefit
is as shown in Fig. 9. The LP model has allocated 25%, 46.87%, 13.13%, 5.62% and 9.37%
of actual irrigated land to Groundnut, Hybrid Maize, Hybrid Jowar, local jowar and Millet
respectively during Kharif season. Similarly during Rabi season optimization model has
allocated 18.75%, 15.63%, 15.63%, 9.38% and 28.12% of the actual irrigated land to local
Jowar, Hybrid Maize, Pulses, Sunflower and wheat respectively. The unirrigated land during
Rabi season is around 12.5% of actual irrigated land. Two seasonal crops namely Sugarcane
and cotton have been allocated an area of 7.81% and 44.78% respectively.
347.2
651.0
182.3
78.1
130.2
372.3
200.1
200.1
120.1
360.2
100.0
400.2
0 200 400 600 800
Groundnut
Hy jowar
Millet
Hy maize
Sunflower
Sugarcane
Optimal Area of crop in Million sq.mts.…
Cro
ps
Optimal Area allocation for Wet Scenario
513.61
1016.37
213.12
411.36
0.00 200.00 400.00 600.00 800.00 1000.00 1200.00
Kharif
Rabi
Sugarcane
Cotton
Optimal water Allocation in Million cubic meter
Optimal water allocation for Wet Scenario
Linear Programming Approach for Optimal Land and Water Resource Allocation under different
Hydrological Scenarios
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Figure 9 Optimal Area allocation for Normal Scenario
Out of total water availability of 1937.07 Mm3during normal scenario nearly 5.9%,
15.56% of water is allocated to sugarcane and cotton respectively as shown in Fig. 10. Kharif
and Rabi crops have got a share of 31.46% and 47.08% respectively. The maximum net
benefit for the average scenario is 5386 Million Rupees as shown in Table 6.
Figure 10 Optimal water allocation for Normal Scenario
The net benefit evaluated for different scenarios in the study area is given in Table 6
below. This indicates that the Net benefit incurred from the command area is higher for
average and wet scenario compared to normal and dry scenario.
Table 6 Net benefit for different scenarios in the command area
Net benefit for different Scenarios in Million Rs
Crop Average Wet Normal Dry
Groundnut 821 821 821 574
Hybrid maize 1652 1652 1652 1319
Hybrid jowar 140 140 140 130
Local jowar 129 129 129 120
Millet 113 113 113 106
Local jowar 493 615 397 370
Hybrid maize 508 508 508 284
Pulses 436 436 436 244
347.2
651.0
182.3
78.1
130.2
240.1
200.1
200.1
120.1
360.2
50.0
286.8
0 200 400 600 800
Groundnut
Hy jowar
Millet
Hy maize
Sunflower
Sugarcane
Optimal Area of crop in Million sq.mts
Cro
ps
Optimal Area allocation for Normal Scenario
609.4
912.1
114.3
301.4
0.0 200.0 400.0 600.0 800.0 1000.0
Kharif
Rabi
Sugarcane
Cotton
Optimal water Allocation in Million cubic meter
Optimal water allocation for Normal Scenario
Shakuntala G. Vadde, Shreedhar R and Chandrashekarayya G. Hiremath
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Sunflower 110 110 110 103
Wheat 399 399 399 373
Sugarcane 75 125 63 38
Cotton 863 863 619 539
Net benefit 5740 5912 5386 4201
5. CONCLUSIONS
In this study two scenarios have been formulated to optimize the reservoir release and the
Cropping pattern using Linear Programming technique for the Ghataprabha command area
located in Karnataka, India. The releases in average years are well approached by those in
normal scenario.The unirrigated land during Rabi season found to be around 7.93% of actual
irrigated land for average scenario and the net benefit incurred was about 5740 million
Rupees. The results of scenario II involving Dry, wet and normal years demonstrated that the
releases are higher for dry scenario than wet scenario and the net benefit was found to be
4201, 5912 and 5386 million Rupees for dry, wet and normal scenarios respectively. The
unirrigated areas during Rabi season for wet, normal scenario are 2.17%and 12.5% of actual
irrigated land. The unirrigated land during Kharif and Rabi seasons for dry scenario found to
be 18.83% and 30% of actual irrigated land respectively.The consideration of different
hydrological years as two different scenarios expected to be very useful for programming of
irrigation water supply and management.
ACKNOWLEDGMENT
The authors convey their sincere thanks to Shri. Alok Shetty, Assistant Executive Engineer
Karnataka Neeravari Nigam Limited, CBC, Sub Div., No.2 Hidkal Dam, Belagavi for his
kind assistance in providing all the required data and information for the successful
completion of proposed work.
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