問題一覧
1
Refers to the number of days between irrigation periods without rainfall.
irrigation frequency
2
It is type of erosion where small channels are formed on the surface of the soil
rill
3
One in which a definite law of certainty exists
Deterministic process
4
The other term for gravity well.
Deep well
5
A storm type occuring at the boundaries of warm moist air and dry cold air.
Frontal storm
6
The no. of days allowed for operating irrigation to a given design area during the peak consumptive period of the crop being irrigated.
irrigation period
7
A concrete-lined trapezoidal canal is to carry a maximum discharge of 2.0 m3/s. The required head loss over a horizontal distance of 1 km is 2.0 m. The side slope is to be set at 1:1 and the permissible b/d ratio is 3. If the Manning’s roughness coefficient is 0.015, the design depth required is
0.56 m
8
A property associated with surface tension of liquid and manifested in the rise and fall of liquids in small diameter tubes.
capillary
9
Amount of rainfall in the rootzone.
effective rainfall
10
The most hydraulically efficient trapezoidal channel section to carry a discharge of 5 m3/s on a bed material with a roughness n of 0.02 and a bottom slope of 1 in 800 should have a bottom width of
1.65 m
11
The soil has a field capacity of 22% and a permanent wilting point of 12 %, both on a dry mass basis. The apparent specific gravity is 1.4. If the rootzone depth is 1.0 m and the management allowable deficit is 50%, the net application depth is
70 mm
12
A 3-ha of cornfield is to be irrigated at a discharge of 250 lps. The average available water holding capacity is 140 mm/m soil, the management allowable deficit is 40%, and the rootzone depth is 0.5 m. The reference crop potential evapotranspiration is 5 mm/day and the crop coefficient is 0.8. Assuming 70% application efficiency, the irrigation period should be
1 1/3 hrs
13
The soil has the following characteristics: porosity = 50 %, bulk density = 1.25g/cc, residual moisture content is 15% dry mass. The rooting depth is 300 mm and the duration of land soaking is 5 days. If the evaporation and percolation losses amount to 5 mm/day the gross land soaking requirement is
27.75 mm/day
14
A notch of regular form through which the irrigation stream is made to flow and flow built as either portable or stationary structures is called:
weir
15
For the most efficient circular cross-section, semi-circle the hydraulic radius is equal to:
its radius
16
A hydraulic structure that serves as an outlet of water in irrigation canals whereby water passes through and discharges into the main farm ditch of service area is called
turnout
17
The amount of water used in producing crop is:
water holding capacity
18
Water that moves freely and drains out of the soil is:
gravitational
19
How much water should be applied to a 6 ha farm where the rooting depth is 80 cm if it is in its permanent wilting point? Volumetric moisture contents are 0.15 and 0.32 for permanent wilting point and field capacity, respectively.
8,160m3
20
Sugarcane is to be irrigated using sprinkler irrigation. The sprinkler spacing is 12.2 m while the lateral spacing is 18.3 m. The soil water holding capacity is 120 mm/m, crop rooting depth is 1.0 m and management allowable deficit is 45%. If the irrigation period is 12 hrs and the application efficiency is 70%, the required sprinkler discharge is
0.4 lps
21
In drainage, open channel is often referred to as:
canals
22
The direct attraction of similar molecules between similar molecules.
cohesion
23
Groundwater is to be pumped from a shallow aquifer for irrigation purposes. The required discharge is 300 gpm. The suction head is 8 ft and the maximum drawdown is 10 ft. The friction and minor losses are 0.45 ft and 0.3 ft, respectively. If the pump efficiency is 60%, the theoretical input power required is
2.4 hp
24
A temporary method of drainage artificially produced in the subsoil with digging a trench from the surface.
mole drain
25
The depth of water in mm or inches to be removed in 24 hr period from the drainage area.
drainage coefficient
26
Other terms for drip irrigation are __________ irrigation and __________ irrigation. This type of overhead irrigation operates at low pressure.
trickle – micro
27
Evapotranspiration in an 8 ha farm is 7 mm/day and percolation losses is 2 mm/day. What is the design discharge of a canal to be able to deliver a 5day requirement of the farm in 24 hours if irrigation efficiency is 75%?
200m3/hr
28
It is the average interval of time within the magnitude of given event will be equaled or exceeded at least once on the average.
return period
29
Ratio of the bulk density to the density of water
apparent specific gravity
30
One thousand two hundred and fifty cubic meters of water was delivered to a 10 ha farm for the month of June in which the consumptive use is estimated at 8 mm/day. The effective rainfall for the period was 150 mm. What is the irrigation efficiency?
72%
31
In open channel, the term A/P is:
hydraulic radius
32
These are usually rural traders or barrio buyers who do accumulation of the produce of individual farmers and bulk these for storage or for distribution to wholesalers
assemblers
33
It is used to divide and distribute the flow of water at desired direction usually placed or built in main farm ditch to divert water to supplementary farm ditches.
division box
34
In designing an open channel, it is necessary to know what the material firming the channel bed is to know the value of:
roughness coefficient
35
This refers to wants for specific satisfiers backed up by an ability and willingness to buy them.
demand
36
An irrigation method formed by building longitudinal levees approximately parallel to the contour and connecting them at a desirable places with levees at right angle.
check contour
37
A device used to control the flow of water to or from a pipeline.
gate
38
Determine the head loss in a 4” aluminum lateral 500 ft long if sprinkler spacing is 50 ft. Sprinkler discharge is 0.25 lps.
2.72ft
39
A closed conduit usually circular, square or rectangular in cross section, used for conveying water across and under an elevated roadway, embankment and dikes.
culvert
40
This is a marketing function which facilitates transfer of ownership
negotiation
41
It also refers to consumptive use by crops.
evapotranspiration
42
It is natural or artificial channel that shortens a meandering stream.
cut off
43
A concept used to evaluate the losses of water during irrigation from the time it leaves that source to the point of use.
irrigation efficiency
44
This is oftentimes not considered a marketing activity, but it is a marketing function. This is because agricultural products must pass through some levels of transformation before being made available to the users. This marketing function increases marketability of products by changing product forms.
processing
45
The most simple form of open channel flow computation is:
steady uniform
46
These are intermediaries who deal directly with the end-users or the consumers. They are the wholesalers’ partners in distribution activities.
retailers
47
The soil has the following characteristics: porosity = 50 %, bulk density = 1.25g/cc, residual moisture content is 15% dry mass. The rooting depth is 300 mm and the duration of land soaking is 5 days. If the evaporation and percolation losses amount to 5 mm/day the gross land soaking requirement is.
27.75mm/day
48
The speed at which water flows in channel is:
velocity
49
It is equal to the cross-sectional area times the velocity of flow
discharge
50
Water that moves freely and drains out of the soil is:
gravitational water
51
It is the state of felt deprivation of some basic satisfaction
need
52
It is the most elaborate method of computing potential evapotranspiration:
Penman
53
Methods of supplying water in the basin
direct supply and cascade supply
54
It is anything offered for sale, attention, and acquisition
product
55
Which is not part of the macro-environment?
suppliers of raw materials
56
Groundwater is to be pumped from a shallow aquifer for irrigation purposes. The required discharge is 300 gpm. The suction head is 8 ft and the maximum drawdown is 10 ft. The friction and minor losses are 0.45 ft and 0.3 ft, respectively. If the pump efficiency is 60%, the theoretical input power required is.
2.4Hp
57
Same as interflow
Subsurface runoff
58
It is the ratio of the dry weight of the soil to the weight of the water with volume equal to the soil bulk volume.
bulk density
59
It accounts for the losses in an irrigation system from the water source and prior to delivery of water into the field ditches.
conveyance efficiency
60
A geologic formation that contains water but do not have the capacity to transmit it.
aquiclude
61
Compute the land soaking requirement for a soil (depth of rootzone = 60cm) with residual moisture content of 18 % by weight, bulk density of 1,320 kg/m3 and porosity of 50%. Standing water for planting is 20 mm.
157.44 mm
62
Farm water requirement minus the application losses is the_______.
farm irrigation requirement
63
What is the rootzone depth of a farm with land soaking requirement of 90mm if the soil porosity is 45%, residual moisture content is 18% (by weight) and bulk density is 1,250kg/m3?
40cm
64
This results from overlapping radii of influence of neighbouring wells.
well interference
65
In furrow irrigation, the rate of water application should be __________ the intake rate of the soil.
less than
66
For an 10 m x10m sprinkler spacing, what is the design sprinkler throw for a 50% overlap?
7.5 m
67
Four liters per second is equal to
both choices
68
Irrigation method used for row crops wherein only a part of the surface is wetted.
furrow irrigation
69
What is the design discharge of a canal to be able to deliver a 6-day requirement of a 6-ha farm in 9 hours if the irrigation requirement is 8mm/day?
0.0889 m3/s
70
The amount of drainage water to be removed per unit time per unit area is the____.
drainage coefficient
71
In Hooghoudt’s drain spacing formula it is assumed that _____.
All of the above.
72
______ is a mathematical expression for the macroscopic flow of water through a porous system.
Darcy’s Law
73
It is the soil moisture constant describing the amount of moisture retained by the soil against a suction pressure of 1/3 atmosphere.
field capacity
74
The infiltration equation based on the exhaustion process is the _____.
Horton’s
75
Run-off is the difference between the gross depth of irrigation water and the____.
net depth requirement
76
It is the type of sprinkler irrigation system where the number of laterals installed is equal to the total number of lateral positions.
set system
77
In a drip system, the allowable pressure variation in a lateral with minimum and average head of 1.51 and 1.38 mters respectively is _____.
0.462 psi
78
The head in an emitter discharging 4 liters of water per hour and with discharge coefficient of 0.798 and exponent of 0.5 is___.
25 m
79
Computer aided method wherein it averages estimated precipitation at all points of a superimposed grid.
Grid-Point Method
80
A soil with root zone depth of 1.2 meters has 24% initial volumetric moisture content, volumetric field capacity of 30%, permanent wilting point of 15% and 50% allowable moisture depletion.
Determine the initial depth of water in the soil.
288 mm
81
A soil with root zone depth of 1.2 meters has 24% initial volumetric moisture content, volumetric field capacity of 30%, permanent wilting point of 15% and 50% allowable moisture depletion.
When soil water reaches or falls below ____, irrigation should be done.
270 mm
82
The field is installed with hand-moved system and 2 sets of laterals can be installed per day. Calculate the minimum numbers of laterals that can be installed per set if there are 5 operating days per irrigation interval.
3
83
Natural drainage occurs when the soil water reaches or exceeds a depth of _____.
360 mm
84
It is a surface irrigation system where the area is subdivided by dikes and water flows over these dikes from one subdivision to another.
basin irrigation
85
Distribution control structures placed across an irrigation ditch to block the flow temporarily and to raise the upstream water level.
checks
86
Using Scobey’s equation for friction loss, a lateral with 10 sprinklers has a reduction coefficient of ____.
0.3964
87
Which is not a component of the impact arm of an impact sprinkler?
nozzle
88
A 20-ft thick confined aquifer with hydraulic conductivity of 400ft/day was tapped by a 4” shallow tubewell. With a radius of influence of 2500 ft, determine the maximum discharge of the STW in liters per second. Assume an allowable drawdown of 12 ft.
20.57
89
Used when there is skewness in the data distribution
Normal Distribution
90
Governed by chance; time series INDEPENDENT
Deterministic process
91
Station locations and amounts of rainfall are plotted on a suitable map, and contours of equal precipitation (isohyets) are then drawn.
Isohyetal
92
This method can be used if there is a piped water-distribution system where a hose pipe can be connected to a tap or outlet and there is enough pressure in the water as it emerges from the hose pipe
Hose pipe
93
In surface irrigation, the ratio between the gross amount of irrigation water and the net requirement of the crop is the _____
application efficiency
94
It is an orderly sequence of planting crop in an area for a 365-day period.
cropping pattern
95
A 21.6mm/day water requirement is equivalent to
2.5 lps/ha
96
In a 5 ha area, it was determined that the soil volumetric field capacity and permanent wilting points are 25% and 15% respectively. Crop consumptive use is 5mm/day, application efficiency is 80% and irrigation application rate is 32m3/hr. The allowable soil moisture depletion is 60%, apparent specific gravity is 1.2 and the depth of rootzone is 0.8m.
Determine the net depth of irrigation water to be applied
48 mm
97
In a 5 ha area, it was determined that the soil volumetric field capacity and permanent wilting points are 25% and 15% respectively. Crop consumptive use is 5mm/day, application efficiency is 80% and irrigation application rate is 32m3/hr. The allowable soil moisture depletion is 60%, apparent specific gravity is 1.2 and the depth of rootzone is 0.8m.
Determine the gross depth of irrigation water to be applied
60 mm
98
In a 5 ha area, it was determined that the soil volumetric field capacity and permanent wilting points are 25% and 15% respectively. Crop consumptive use is 5mm/day, application efficiency is 80% and irrigation application rate is 32m3/hr. The allowable soil moisture depletion is 60%, apparent specific gravity is 1.2 and the depth of rootzone is 0.8m.
the irrigation interval in days is __________.
10
99
In a 5 ha area, it was determined that the soil volumetric field capacity and permanent wilting points are 25% and 15% respectively. Crop consumptive use is 5mm/day, application efficiency is 80% and irrigation application rate is 32m3/hr. The allowable soil moisture depletion is 60%, apparent specific gravity is 1.2 and the depth of rootzone is 0.8m.
Compute for the irrigation period in hours.
93
100
In the furrow irrigation, it is the difference between the depth of water that infiltrated and the net depth requirement is the
deep percolation
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99問 • 10ヶ月前問題一覧
1
Refers to the number of days between irrigation periods without rainfall.
irrigation frequency
2
It is type of erosion where small channels are formed on the surface of the soil
rill
3
One in which a definite law of certainty exists
Deterministic process
4
The other term for gravity well.
Deep well
5
A storm type occuring at the boundaries of warm moist air and dry cold air.
Frontal storm
6
The no. of days allowed for operating irrigation to a given design area during the peak consumptive period of the crop being irrigated.
irrigation period
7
A concrete-lined trapezoidal canal is to carry a maximum discharge of 2.0 m3/s. The required head loss over a horizontal distance of 1 km is 2.0 m. The side slope is to be set at 1:1 and the permissible b/d ratio is 3. If the Manning’s roughness coefficient is 0.015, the design depth required is
0.56 m
8
A property associated with surface tension of liquid and manifested in the rise and fall of liquids in small diameter tubes.
capillary
9
Amount of rainfall in the rootzone.
effective rainfall
10
The most hydraulically efficient trapezoidal channel section to carry a discharge of 5 m3/s on a bed material with a roughness n of 0.02 and a bottom slope of 1 in 800 should have a bottom width of
1.65 m
11
The soil has a field capacity of 22% and a permanent wilting point of 12 %, both on a dry mass basis. The apparent specific gravity is 1.4. If the rootzone depth is 1.0 m and the management allowable deficit is 50%, the net application depth is
70 mm
12
A 3-ha of cornfield is to be irrigated at a discharge of 250 lps. The average available water holding capacity is 140 mm/m soil, the management allowable deficit is 40%, and the rootzone depth is 0.5 m. The reference crop potential evapotranspiration is 5 mm/day and the crop coefficient is 0.8. Assuming 70% application efficiency, the irrigation period should be
1 1/3 hrs
13
The soil has the following characteristics: porosity = 50 %, bulk density = 1.25g/cc, residual moisture content is 15% dry mass. The rooting depth is 300 mm and the duration of land soaking is 5 days. If the evaporation and percolation losses amount to 5 mm/day the gross land soaking requirement is
27.75 mm/day
14
A notch of regular form through which the irrigation stream is made to flow and flow built as either portable or stationary structures is called:
weir
15
For the most efficient circular cross-section, semi-circle the hydraulic radius is equal to:
its radius
16
A hydraulic structure that serves as an outlet of water in irrigation canals whereby water passes through and discharges into the main farm ditch of service area is called
turnout
17
The amount of water used in producing crop is:
water holding capacity
18
Water that moves freely and drains out of the soil is:
gravitational
19
How much water should be applied to a 6 ha farm where the rooting depth is 80 cm if it is in its permanent wilting point? Volumetric moisture contents are 0.15 and 0.32 for permanent wilting point and field capacity, respectively.
8,160m3
20
Sugarcane is to be irrigated using sprinkler irrigation. The sprinkler spacing is 12.2 m while the lateral spacing is 18.3 m. The soil water holding capacity is 120 mm/m, crop rooting depth is 1.0 m and management allowable deficit is 45%. If the irrigation period is 12 hrs and the application efficiency is 70%, the required sprinkler discharge is
0.4 lps
21
In drainage, open channel is often referred to as:
canals
22
The direct attraction of similar molecules between similar molecules.
cohesion
23
Groundwater is to be pumped from a shallow aquifer for irrigation purposes. The required discharge is 300 gpm. The suction head is 8 ft and the maximum drawdown is 10 ft. The friction and minor losses are 0.45 ft and 0.3 ft, respectively. If the pump efficiency is 60%, the theoretical input power required is
2.4 hp
24
A temporary method of drainage artificially produced in the subsoil with digging a trench from the surface.
mole drain
25
The depth of water in mm or inches to be removed in 24 hr period from the drainage area.
drainage coefficient
26
Other terms for drip irrigation are __________ irrigation and __________ irrigation. This type of overhead irrigation operates at low pressure.
trickle – micro
27
Evapotranspiration in an 8 ha farm is 7 mm/day and percolation losses is 2 mm/day. What is the design discharge of a canal to be able to deliver a 5day requirement of the farm in 24 hours if irrigation efficiency is 75%?
200m3/hr
28
It is the average interval of time within the magnitude of given event will be equaled or exceeded at least once on the average.
return period
29
Ratio of the bulk density to the density of water
apparent specific gravity
30
One thousand two hundred and fifty cubic meters of water was delivered to a 10 ha farm for the month of June in which the consumptive use is estimated at 8 mm/day. The effective rainfall for the period was 150 mm. What is the irrigation efficiency?
72%
31
In open channel, the term A/P is:
hydraulic radius
32
These are usually rural traders or barrio buyers who do accumulation of the produce of individual farmers and bulk these for storage or for distribution to wholesalers
assemblers
33
It is used to divide and distribute the flow of water at desired direction usually placed or built in main farm ditch to divert water to supplementary farm ditches.
division box
34
In designing an open channel, it is necessary to know what the material firming the channel bed is to know the value of:
roughness coefficient
35
This refers to wants for specific satisfiers backed up by an ability and willingness to buy them.
demand
36
An irrigation method formed by building longitudinal levees approximately parallel to the contour and connecting them at a desirable places with levees at right angle.
check contour
37
A device used to control the flow of water to or from a pipeline.
gate
38
Determine the head loss in a 4” aluminum lateral 500 ft long if sprinkler spacing is 50 ft. Sprinkler discharge is 0.25 lps.
2.72ft
39
A closed conduit usually circular, square or rectangular in cross section, used for conveying water across and under an elevated roadway, embankment and dikes.
culvert
40
This is a marketing function which facilitates transfer of ownership
negotiation
41
It also refers to consumptive use by crops.
evapotranspiration
42
It is natural or artificial channel that shortens a meandering stream.
cut off
43
A concept used to evaluate the losses of water during irrigation from the time it leaves that source to the point of use.
irrigation efficiency
44
This is oftentimes not considered a marketing activity, but it is a marketing function. This is because agricultural products must pass through some levels of transformation before being made available to the users. This marketing function increases marketability of products by changing product forms.
processing
45
The most simple form of open channel flow computation is:
steady uniform
46
These are intermediaries who deal directly with the end-users or the consumers. They are the wholesalers’ partners in distribution activities.
retailers
47
The soil has the following characteristics: porosity = 50 %, bulk density = 1.25g/cc, residual moisture content is 15% dry mass. The rooting depth is 300 mm and the duration of land soaking is 5 days. If the evaporation and percolation losses amount to 5 mm/day the gross land soaking requirement is.
27.75mm/day
48
The speed at which water flows in channel is:
velocity
49
It is equal to the cross-sectional area times the velocity of flow
discharge
50
Water that moves freely and drains out of the soil is:
gravitational water
51
It is the state of felt deprivation of some basic satisfaction
need
52
It is the most elaborate method of computing potential evapotranspiration:
Penman
53
Methods of supplying water in the basin
direct supply and cascade supply
54
It is anything offered for sale, attention, and acquisition
product
55
Which is not part of the macro-environment?
suppliers of raw materials
56
Groundwater is to be pumped from a shallow aquifer for irrigation purposes. The required discharge is 300 gpm. The suction head is 8 ft and the maximum drawdown is 10 ft. The friction and minor losses are 0.45 ft and 0.3 ft, respectively. If the pump efficiency is 60%, the theoretical input power required is.
2.4Hp
57
Same as interflow
Subsurface runoff
58
It is the ratio of the dry weight of the soil to the weight of the water with volume equal to the soil bulk volume.
bulk density
59
It accounts for the losses in an irrigation system from the water source and prior to delivery of water into the field ditches.
conveyance efficiency
60
A geologic formation that contains water but do not have the capacity to transmit it.
aquiclude
61
Compute the land soaking requirement for a soil (depth of rootzone = 60cm) with residual moisture content of 18 % by weight, bulk density of 1,320 kg/m3 and porosity of 50%. Standing water for planting is 20 mm.
157.44 mm
62
Farm water requirement minus the application losses is the_______.
farm irrigation requirement
63
What is the rootzone depth of a farm with land soaking requirement of 90mm if the soil porosity is 45%, residual moisture content is 18% (by weight) and bulk density is 1,250kg/m3?
40cm
64
This results from overlapping radii of influence of neighbouring wells.
well interference
65
In furrow irrigation, the rate of water application should be __________ the intake rate of the soil.
less than
66
For an 10 m x10m sprinkler spacing, what is the design sprinkler throw for a 50% overlap?
7.5 m
67
Four liters per second is equal to
both choices
68
Irrigation method used for row crops wherein only a part of the surface is wetted.
furrow irrigation
69
What is the design discharge of a canal to be able to deliver a 6-day requirement of a 6-ha farm in 9 hours if the irrigation requirement is 8mm/day?
0.0889 m3/s
70
The amount of drainage water to be removed per unit time per unit area is the____.
drainage coefficient
71
In Hooghoudt’s drain spacing formula it is assumed that _____.
All of the above.
72
______ is a mathematical expression for the macroscopic flow of water through a porous system.
Darcy’s Law
73
It is the soil moisture constant describing the amount of moisture retained by the soil against a suction pressure of 1/3 atmosphere.
field capacity
74
The infiltration equation based on the exhaustion process is the _____.
Horton’s
75
Run-off is the difference between the gross depth of irrigation water and the____.
net depth requirement
76
It is the type of sprinkler irrigation system where the number of laterals installed is equal to the total number of lateral positions.
set system
77
In a drip system, the allowable pressure variation in a lateral with minimum and average head of 1.51 and 1.38 mters respectively is _____.
0.462 psi
78
The head in an emitter discharging 4 liters of water per hour and with discharge coefficient of 0.798 and exponent of 0.5 is___.
25 m
79
Computer aided method wherein it averages estimated precipitation at all points of a superimposed grid.
Grid-Point Method
80
A soil with root zone depth of 1.2 meters has 24% initial volumetric moisture content, volumetric field capacity of 30%, permanent wilting point of 15% and 50% allowable moisture depletion.
Determine the initial depth of water in the soil.
288 mm
81
A soil with root zone depth of 1.2 meters has 24% initial volumetric moisture content, volumetric field capacity of 30%, permanent wilting point of 15% and 50% allowable moisture depletion.
When soil water reaches or falls below ____, irrigation should be done.
270 mm
82
The field is installed with hand-moved system and 2 sets of laterals can be installed per day. Calculate the minimum numbers of laterals that can be installed per set if there are 5 operating days per irrigation interval.
3
83
Natural drainage occurs when the soil water reaches or exceeds a depth of _____.
360 mm
84
It is a surface irrigation system where the area is subdivided by dikes and water flows over these dikes from one subdivision to another.
basin irrigation
85
Distribution control structures placed across an irrigation ditch to block the flow temporarily and to raise the upstream water level.
checks
86
Using Scobey’s equation for friction loss, a lateral with 10 sprinklers has a reduction coefficient of ____.
0.3964
87
Which is not a component of the impact arm of an impact sprinkler?
nozzle
88
A 20-ft thick confined aquifer with hydraulic conductivity of 400ft/day was tapped by a 4” shallow tubewell. With a radius of influence of 2500 ft, determine the maximum discharge of the STW in liters per second. Assume an allowable drawdown of 12 ft.
20.57
89
Used when there is skewness in the data distribution
Normal Distribution
90
Governed by chance; time series INDEPENDENT
Deterministic process
91
Station locations and amounts of rainfall are plotted on a suitable map, and contours of equal precipitation (isohyets) are then drawn.
Isohyetal
92
This method can be used if there is a piped water-distribution system where a hose pipe can be connected to a tap or outlet and there is enough pressure in the water as it emerges from the hose pipe
Hose pipe
93
In surface irrigation, the ratio between the gross amount of irrigation water and the net requirement of the crop is the _____
application efficiency
94
It is an orderly sequence of planting crop in an area for a 365-day period.
cropping pattern
95
A 21.6mm/day water requirement is equivalent to
2.5 lps/ha
96
In a 5 ha area, it was determined that the soil volumetric field capacity and permanent wilting points are 25% and 15% respectively. Crop consumptive use is 5mm/day, application efficiency is 80% and irrigation application rate is 32m3/hr. The allowable soil moisture depletion is 60%, apparent specific gravity is 1.2 and the depth of rootzone is 0.8m.
Determine the net depth of irrigation water to be applied
48 mm
97
In a 5 ha area, it was determined that the soil volumetric field capacity and permanent wilting points are 25% and 15% respectively. Crop consumptive use is 5mm/day, application efficiency is 80% and irrigation application rate is 32m3/hr. The allowable soil moisture depletion is 60%, apparent specific gravity is 1.2 and the depth of rootzone is 0.8m.
Determine the gross depth of irrigation water to be applied
60 mm
98
In a 5 ha area, it was determined that the soil volumetric field capacity and permanent wilting points are 25% and 15% respectively. Crop consumptive use is 5mm/day, application efficiency is 80% and irrigation application rate is 32m3/hr. The allowable soil moisture depletion is 60%, apparent specific gravity is 1.2 and the depth of rootzone is 0.8m.
the irrigation interval in days is __________.
10
99
In a 5 ha area, it was determined that the soil volumetric field capacity and permanent wilting points are 25% and 15% respectively. Crop consumptive use is 5mm/day, application efficiency is 80% and irrigation application rate is 32m3/hr. The allowable soil moisture depletion is 60%, apparent specific gravity is 1.2 and the depth of rootzone is 0.8m.
Compute for the irrigation period in hours.
93
100
In the furrow irrigation, it is the difference between the depth of water that infiltrated and the net depth requirement is the
deep percolation