Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2018 Winter 7th Sem New 2174001 Irrigation And Water Resources Engineering Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VII (NEW) EXAMINATION ? WINTER 2018
Subject Code: 2174001 Date: 15/11/2018
Subject Name: Irrigation and Water Resources Engineering
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
MARKS
Q.1 (a)
A river reach has a flood wave passing thorugh it. At a given instant the storage of water in
the reach was estimated as 15.5 ha.m. What would be the storage in the reach after an
interval of 3 hours if the average inflow and outflow duirng the time period are 14.2 m
3
/s
and 10.6 m
3
/s respectively ?
03
(b) Prepare the flowchart for the steps followed in determining areal mean rainfall for a
particular catchment using a GIS tool (QGIS), correlate with the term project carried
out and present the flowchart accordingly?
04
(c) The average monthly streamflow values in a river are 150, 200, 420, 400, 350, 290,
320, 230, 250, 210, 180 and 100 (m
3
/s). Prepare a flow duration curve for this river
using this data and answer the following.
a). What is the value of firm power corresponding to 90% dependable flow?
b). What is the value of 75% dependable flow?
c). What is the dependability of 300 m
3
/s?
Assume 80% efficiency and 100m head available for hydropower generation.
07
Q.2 (a) Distinguish between i) Field Capacity, permanent wilting point and Available water
for the crop ,
ii) ?-index and W-index.
04
(b) There are 6 raingauge stations available to calculate the rainfall characteristics of a
catchment whose shape can be approximately described by straight lines joining the
following coordinates (distances in kilometers): (30,0), (80,10), (110,30), (140,90),
(130,115), (40,110),(15,60). Coordinates of the raingauge stations and annual rainfall
recorded in them in the year 2011 are given below:
Station 1 2 3 4 5 6
Co-
ordinates
(40,50) (50,0) (90,30) (90,90) (90, 140) (40,80)
Annual
Rainfall
(cm)
156 136 128 102 85 128
Determine the average annual rainfall (areal mean precipitation) over the catchment
using i) Thiessen mean method (Thiessen polygon method), and ii) arithmetic
mean method. Compare the methods based on the results obtained.
10
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1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VII (NEW) EXAMINATION ? WINTER 2018
Subject Code: 2174001 Date: 15/11/2018
Subject Name: Irrigation and Water Resources Engineering
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
MARKS
Q.1 (a)
A river reach has a flood wave passing thorugh it. At a given instant the storage of water in
the reach was estimated as 15.5 ha.m. What would be the storage in the reach after an
interval of 3 hours if the average inflow and outflow duirng the time period are 14.2 m
3
/s
and 10.6 m
3
/s respectively ?
03
(b) Prepare the flowchart for the steps followed in determining areal mean rainfall for a
particular catchment using a GIS tool (QGIS), correlate with the term project carried
out and present the flowchart accordingly?
04
(c) The average monthly streamflow values in a river are 150, 200, 420, 400, 350, 290,
320, 230, 250, 210, 180 and 100 (m
3
/s). Prepare a flow duration curve for this river
using this data and answer the following.
a). What is the value of firm power corresponding to 90% dependable flow?
b). What is the value of 75% dependable flow?
c). What is the dependability of 300 m
3
/s?
Assume 80% efficiency and 100m head available for hydropower generation.
07
Q.2 (a) Distinguish between i) Field Capacity, permanent wilting point and Available water
for the crop ,
ii) ?-index and W-index.
04
(b) There are 6 raingauge stations available to calculate the rainfall characteristics of a
catchment whose shape can be approximately described by straight lines joining the
following coordinates (distances in kilometers): (30,0), (80,10), (110,30), (140,90),
(130,115), (40,110),(15,60). Coordinates of the raingauge stations and annual rainfall
recorded in them in the year 2011 are given below:
Station 1 2 3 4 5 6
Co-
ordinates
(40,50) (50,0) (90,30) (90,90) (90, 140) (40,80)
Annual
Rainfall
(cm)
156 136 128 102 85 128
Determine the average annual rainfall (areal mean precipitation) over the catchment
using i) Thiessen mean method (Thiessen polygon method), and ii) arithmetic
mean method. Compare the methods based on the results obtained.
10
2
OR
(c) The mass curve of rainfall in a storm of total duration 270 minutes is given below:
Time since
start in
Minutes
0 30 60 90 120 150 180 210 240 270
Cumulative
Rainfall
(mm)
0 6 18 21 36 43 49 52 53 54
i) Draw the hyetograph of the storm at 30 minutes time step.
ii) Plot the maximum intensity-duration curve for this storm.
10
Q.3 (a) List out the important assumptions made in the Unit Hydrograph (UH) Theory of
modeling the effective rainfall-runoff process?
03
(b) Enlist the various Recording types of Rain-gauges and Explain any one of them with
a neat sketch?
04
(c) The record of annual rainfall at station A covering a period of 22 years is given
below:
Year Annual rainfall
(mm)
Year Annual rainfall
(mm)
1960 1300 1971 900
1961 840 1972 1020
1962 760 1973 1080
1963 890 1974 600
1964 1120 1975 750
1965 960 1976 1200
1966 800 1977 1600
1967 1250 1978 850
1968 1430 1979 1060
1969 890 1980 830
1970 780 1981 950
i) Estimate the annual rainfall with return periods of 10 years and 50 years.
ii) What would be the probability of an annual rainfall of magnitude equal
to or exceeding 1000 mm occurring at Station A?
iii) What is the 75% dependable annual rainfall at station A?
07
OR
Q.3 (a) Discuss the factors that affect the evaporation from a water body? Explain the methods
to reduce Evaporation Losses?
03
(b) Discuss the current practice and status of rainfall recording in India? 04
(c) The Infiltration capacity data obtained in a flooding type double ring infiltrometer
test is given below:
Time since
start
(minutes)
5 10 15 25 45 60 75 90 110 130
Cumulative
infiltration
depth (cm)
1.75 3.00 3.95 5.50 7.25 8.30 9.30 10.20 11.28 12.36
07
FirstRanker.com - FirstRanker's Choice
1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VII (NEW) EXAMINATION ? WINTER 2018
Subject Code: 2174001 Date: 15/11/2018
Subject Name: Irrigation and Water Resources Engineering
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
MARKS
Q.1 (a)
A river reach has a flood wave passing thorugh it. At a given instant the storage of water in
the reach was estimated as 15.5 ha.m. What would be the storage in the reach after an
interval of 3 hours if the average inflow and outflow duirng the time period are 14.2 m
3
/s
and 10.6 m
3
/s respectively ?
03
(b) Prepare the flowchart for the steps followed in determining areal mean rainfall for a
particular catchment using a GIS tool (QGIS), correlate with the term project carried
out and present the flowchart accordingly?
04
(c) The average monthly streamflow values in a river are 150, 200, 420, 400, 350, 290,
320, 230, 250, 210, 180 and 100 (m
3
/s). Prepare a flow duration curve for this river
using this data and answer the following.
a). What is the value of firm power corresponding to 90% dependable flow?
b). What is the value of 75% dependable flow?
c). What is the dependability of 300 m
3
/s?
Assume 80% efficiency and 100m head available for hydropower generation.
07
Q.2 (a) Distinguish between i) Field Capacity, permanent wilting point and Available water
for the crop ,
ii) ?-index and W-index.
04
(b) There are 6 raingauge stations available to calculate the rainfall characteristics of a
catchment whose shape can be approximately described by straight lines joining the
following coordinates (distances in kilometers): (30,0), (80,10), (110,30), (140,90),
(130,115), (40,110),(15,60). Coordinates of the raingauge stations and annual rainfall
recorded in them in the year 2011 are given below:
Station 1 2 3 4 5 6
Co-
ordinates
(40,50) (50,0) (90,30) (90,90) (90, 140) (40,80)
Annual
Rainfall
(cm)
156 136 128 102 85 128
Determine the average annual rainfall (areal mean precipitation) over the catchment
using i) Thiessen mean method (Thiessen polygon method), and ii) arithmetic
mean method. Compare the methods based on the results obtained.
10
2
OR
(c) The mass curve of rainfall in a storm of total duration 270 minutes is given below:
Time since
start in
Minutes
0 30 60 90 120 150 180 210 240 270
Cumulative
Rainfall
(mm)
0 6 18 21 36 43 49 52 53 54
i) Draw the hyetograph of the storm at 30 minutes time step.
ii) Plot the maximum intensity-duration curve for this storm.
10
Q.3 (a) List out the important assumptions made in the Unit Hydrograph (UH) Theory of
modeling the effective rainfall-runoff process?
03
(b) Enlist the various Recording types of Rain-gauges and Explain any one of them with
a neat sketch?
04
(c) The record of annual rainfall at station A covering a period of 22 years is given
below:
Year Annual rainfall
(mm)
Year Annual rainfall
(mm)
1960 1300 1971 900
1961 840 1972 1020
1962 760 1973 1080
1963 890 1974 600
1964 1120 1975 750
1965 960 1976 1200
1966 800 1977 1600
1967 1250 1978 850
1968 1430 1979 1060
1969 890 1980 830
1970 780 1981 950
i) Estimate the annual rainfall with return periods of 10 years and 50 years.
ii) What would be the probability of an annual rainfall of magnitude equal
to or exceeding 1000 mm occurring at Station A?
iii) What is the 75% dependable annual rainfall at station A?
07
OR
Q.3 (a) Discuss the factors that affect the evaporation from a water body? Explain the methods
to reduce Evaporation Losses?
03
(b) Discuss the current practice and status of rainfall recording in India? 04
(c) The Infiltration capacity data obtained in a flooding type double ring infiltrometer
test is given below:
Time since
start
(minutes)
5 10 15 25 45 60 75 90 110 130
Cumulative
infiltration
depth (cm)
1.75 3.00 3.95 5.50 7.25 8.30 9.30 10.20 11.28 12.36
07
3
i) For this data plot the curves of infiltration capacity vs time and
cumulative infiltration vs time.
ii) Obtain the best values of the parameters in Green-Ampt?s equation to
represent this data set.
Q.4 (a) What is a Storm Hydrograph, mention its components with a neat sketch? 03
(b) The infiltration capacity in a catchment is represented by Horton?s equation as
?? ?? = 3 . 0 + ?? ? 2 ??
Where ?? ?? is in cm/h and t is in hours. Assuming the infiltration to take place at
capacity rates in a storm of 60 minutes duration. Estimate the depth of infiltration
in i) the first 30 minutes and ii) the second 30 minute of the storm.
04
(c) Given a 2-hour Unit Hydrograph ordinates, find the 3- hour Unit Hydrograph for
the catchment? Mention by which approach a 3-hour Unit Hydrograph would be
constructed and what is the justification for the same?
Time(Hours) 0 2 4 6 8 10 12 14 16 18 20 22
2-Hour
UH(m
3
/s)
0 20 60 150 120 90 70 50 32 20 10 0
07
OR
Q.4 (a) Define Perennial river, Intermittent river and Ephemeral river? 03
(b) The infiltration capacity of soil in a small watershed was found to be 6 cm/h before
a rainfall event. It was found to be 1.2 cm/h at the end of 8 hours of storm. If the total
infiltration during the 8 hours period of storm was 15 cm, estimate the value of the
decay coefficient Kh in Horton?s infiltration capacity equation?
04
(c) A storm with 10 cm of precipitation produced a direct runoff of 5.8 cm. The
duration of the rainfall was 16 hours and its time distribution is given below.
Estimate the ? ? index of the storm.
Time from
start (h)
0 2 4 6 8 10 12 14 16
Cumulative
Rainfall
(cm)
0 0.4 1.3 2.8 5.1 6.9 8.5 9.5 10
07
Q.5 (a) Define Crop Period, Duty and Delta in terms of Irrigation water demand? 03
(b) What is Duty? Derive a relationship between Duty and Delta? 04
(c) Wheat is sown in an area in the Indo-Gangetic plain in the beginning of December
and is harvested after four months, in the beginning of April. The reference
evapotranspiration for these months are estimated as: December: 2.3 mm/d, January:
2.5 mm/d, February: 3.0 mm/d, and March: 5.9 mm/d. Estimate the total water
requirement (delta), using the crop factor method, and compare with the delta from
Table 2 (Given in Appendix). Also compute the duty of canal water? Refer to Table
1 given in Appendix for crop factor for different stages of Wheat growth?
07
OR
Q.5 (a) Define: Base Period, Kor Period and Culturable Command Area in terms of
Irrigation water demand?
03
(b) Describe the use of flow mass curve to estimate the storage requirement of a reservoir
to meet a specific demand pattern. What are the limitations of flow mass curve?
04
(c) A small catchment has an area of 68 ha and consists of Type-C soil. The land cover
is 50% good condition parks, 10% commercial and business area, 30% residential,
and 10% roads/paved areas. Assuming normal moisture conditions, determine the
volume of direct runoff from a design storm of total rainfall of 200 mm from this
catchment. What would be the values of runoff volumes if the past 5- day total
rainfalls were 20mm and 60 mm, respectively, assuming growing season in the
catchment?
07
FirstRanker.com - FirstRanker's Choice
1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VII (NEW) EXAMINATION ? WINTER 2018
Subject Code: 2174001 Date: 15/11/2018
Subject Name: Irrigation and Water Resources Engineering
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
MARKS
Q.1 (a)
A river reach has a flood wave passing thorugh it. At a given instant the storage of water in
the reach was estimated as 15.5 ha.m. What would be the storage in the reach after an
interval of 3 hours if the average inflow and outflow duirng the time period are 14.2 m
3
/s
and 10.6 m
3
/s respectively ?
03
(b) Prepare the flowchart for the steps followed in determining areal mean rainfall for a
particular catchment using a GIS tool (QGIS), correlate with the term project carried
out and present the flowchart accordingly?
04
(c) The average monthly streamflow values in a river are 150, 200, 420, 400, 350, 290,
320, 230, 250, 210, 180 and 100 (m
3
/s). Prepare a flow duration curve for this river
using this data and answer the following.
a). What is the value of firm power corresponding to 90% dependable flow?
b). What is the value of 75% dependable flow?
c). What is the dependability of 300 m
3
/s?
Assume 80% efficiency and 100m head available for hydropower generation.
07
Q.2 (a) Distinguish between i) Field Capacity, permanent wilting point and Available water
for the crop ,
ii) ?-index and W-index.
04
(b) There are 6 raingauge stations available to calculate the rainfall characteristics of a
catchment whose shape can be approximately described by straight lines joining the
following coordinates (distances in kilometers): (30,0), (80,10), (110,30), (140,90),
(130,115), (40,110),(15,60). Coordinates of the raingauge stations and annual rainfall
recorded in them in the year 2011 are given below:
Station 1 2 3 4 5 6
Co-
ordinates
(40,50) (50,0) (90,30) (90,90) (90, 140) (40,80)
Annual
Rainfall
(cm)
156 136 128 102 85 128
Determine the average annual rainfall (areal mean precipitation) over the catchment
using i) Thiessen mean method (Thiessen polygon method), and ii) arithmetic
mean method. Compare the methods based on the results obtained.
10
2
OR
(c) The mass curve of rainfall in a storm of total duration 270 minutes is given below:
Time since
start in
Minutes
0 30 60 90 120 150 180 210 240 270
Cumulative
Rainfall
(mm)
0 6 18 21 36 43 49 52 53 54
i) Draw the hyetograph of the storm at 30 minutes time step.
ii) Plot the maximum intensity-duration curve for this storm.
10
Q.3 (a) List out the important assumptions made in the Unit Hydrograph (UH) Theory of
modeling the effective rainfall-runoff process?
03
(b) Enlist the various Recording types of Rain-gauges and Explain any one of them with
a neat sketch?
04
(c) The record of annual rainfall at station A covering a period of 22 years is given
below:
Year Annual rainfall
(mm)
Year Annual rainfall
(mm)
1960 1300 1971 900
1961 840 1972 1020
1962 760 1973 1080
1963 890 1974 600
1964 1120 1975 750
1965 960 1976 1200
1966 800 1977 1600
1967 1250 1978 850
1968 1430 1979 1060
1969 890 1980 830
1970 780 1981 950
i) Estimate the annual rainfall with return periods of 10 years and 50 years.
ii) What would be the probability of an annual rainfall of magnitude equal
to or exceeding 1000 mm occurring at Station A?
iii) What is the 75% dependable annual rainfall at station A?
07
OR
Q.3 (a) Discuss the factors that affect the evaporation from a water body? Explain the methods
to reduce Evaporation Losses?
03
(b) Discuss the current practice and status of rainfall recording in India? 04
(c) The Infiltration capacity data obtained in a flooding type double ring infiltrometer
test is given below:
Time since
start
(minutes)
5 10 15 25 45 60 75 90 110 130
Cumulative
infiltration
depth (cm)
1.75 3.00 3.95 5.50 7.25 8.30 9.30 10.20 11.28 12.36
07
3
i) For this data plot the curves of infiltration capacity vs time and
cumulative infiltration vs time.
ii) Obtain the best values of the parameters in Green-Ampt?s equation to
represent this data set.
Q.4 (a) What is a Storm Hydrograph, mention its components with a neat sketch? 03
(b) The infiltration capacity in a catchment is represented by Horton?s equation as
?? ?? = 3 . 0 + ?? ? 2 ??
Where ?? ?? is in cm/h and t is in hours. Assuming the infiltration to take place at
capacity rates in a storm of 60 minutes duration. Estimate the depth of infiltration
in i) the first 30 minutes and ii) the second 30 minute of the storm.
04
(c) Given a 2-hour Unit Hydrograph ordinates, find the 3- hour Unit Hydrograph for
the catchment? Mention by which approach a 3-hour Unit Hydrograph would be
constructed and what is the justification for the same?
Time(Hours) 0 2 4 6 8 10 12 14 16 18 20 22
2-Hour
UH(m
3
/s)
0 20 60 150 120 90 70 50 32 20 10 0
07
OR
Q.4 (a) Define Perennial river, Intermittent river and Ephemeral river? 03
(b) The infiltration capacity of soil in a small watershed was found to be 6 cm/h before
a rainfall event. It was found to be 1.2 cm/h at the end of 8 hours of storm. If the total
infiltration during the 8 hours period of storm was 15 cm, estimate the value of the
decay coefficient Kh in Horton?s infiltration capacity equation?
04
(c) A storm with 10 cm of precipitation produced a direct runoff of 5.8 cm. The
duration of the rainfall was 16 hours and its time distribution is given below.
Estimate the ? ? index of the storm.
Time from
start (h)
0 2 4 6 8 10 12 14 16
Cumulative
Rainfall
(cm)
0 0.4 1.3 2.8 5.1 6.9 8.5 9.5 10
07
Q.5 (a) Define Crop Period, Duty and Delta in terms of Irrigation water demand? 03
(b) What is Duty? Derive a relationship between Duty and Delta? 04
(c) Wheat is sown in an area in the Indo-Gangetic plain in the beginning of December
and is harvested after four months, in the beginning of April. The reference
evapotranspiration for these months are estimated as: December: 2.3 mm/d, January:
2.5 mm/d, February: 3.0 mm/d, and March: 5.9 mm/d. Estimate the total water
requirement (delta), using the crop factor method, and compare with the delta from
Table 2 (Given in Appendix). Also compute the duty of canal water? Refer to Table
1 given in Appendix for crop factor for different stages of Wheat growth?
07
OR
Q.5 (a) Define: Base Period, Kor Period and Culturable Command Area in terms of
Irrigation water demand?
03
(b) Describe the use of flow mass curve to estimate the storage requirement of a reservoir
to meet a specific demand pattern. What are the limitations of flow mass curve?
04
(c) A small catchment has an area of 68 ha and consists of Type-C soil. The land cover
is 50% good condition parks, 10% commercial and business area, 30% residential,
and 10% roads/paved areas. Assuming normal moisture conditions, determine the
volume of direct runoff from a design storm of total rainfall of 200 mm from this
catchment. What would be the values of runoff volumes if the past 5- day total
rainfalls were 20mm and 60 mm, respectively, assuming growing season in the
catchment?
07
4
[Note: The curve numbers for Type-C soil for different land use conditions are given
in brackets as follows: Good condition parks (74), Commercial and business (94),
Residential (90), Paved/Roads (98). Assuming 20% of storage as abstraction]
Appendix
Table 1: Crop factor for different stages of growth
Crop? Wheat Potato Tomato
Stage ? Period
(Days)
Crop Factor Period
(Days)
Crop Factor Period
(Days)
Crop Factor
Initial 15 0.35 25-30 0.45 30-45 0.45
Development 25-30 0.75 30-35 0.75 40-45 0.75
Mid-Season 50-65 1.15 30-50 1.15 40-70 1.15
Late-season 30-40 0.45 20-30 0.85 25-30 0.80
Total 120-150 - 105-145 - 135-180 -
Table 2:Water requirement of some crops
Crop Base Period
(days)
Delta (cm) Kor Period (days) Kor depth (cm)
Wheat 120 40 28 12
Rice 120 125 20 30
Potato 105 75 25 25
Sugarcane 320 200 40 35
Table 3: AMC Classification in SCS-CN Method
AMC Type Cumulative rainfall over past five days (mm)
Dormant Season Growing Season
I <13 <36
II 13 to 28 36 to 53
III >28 >53
Some Important relationships:
i). ?? = 25 . 4 {
1 0 0 0
????
? 10 }
ii). ???? =
( ?? ? ?? ?? )
2
( ?? ? ?? ?? + ?? )
iii). ???? ( ?? ) =
4 . 2 ???? ( ???? )
10 ? 0 . 0 5 8 ???? ( ???? )
iv). ???? ( ?????? ) =
23 ???? ( ???? )
( 10 + 0 . 13 ???? ( ???? )
*************
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This post was last modified on 20 February 2020