Transcript LOW COST MICRO TUBE DRIP SYSTEM - SIMI

LOW COST MICROTUBE
DRIP SYSTEM
Presentation by J. N. Roy
General design strategy
– based on locally available components
– limited skill and low capital requirements to design,
service and maintain
– income generation potential (cover the investment
cost in one irrigation season)
– available in a range of small packages (20 square
meter – 1 hectare)
– easy to understand, operate and maintain by
unsophisticated users
– work at 1-3 meter inlet pressure head
Technical specifications
Lay flat lateral tube
Wall thickness - 125 + 5 microns (5 + 0.2 mils)
- 250 + 5 microns (10 + 0.2 mils)
Width
26 + 0.5 mm
Microtube emitter
Microtube length
• For vegetable and regular row crop – 20
cm (8 inch) with a tight overhand knot
• For lateral with double microtube – 10 cm
longer than half the row width
• Horticulture – 1 to 1.5 meter (3.3 – 5 feet)
• No of microtube per horticulture crop (1
microtube for banana & papaya, 4
microtubes for citrus)
• Inlet end of microtube pointing downwards
Inlet pressure head
1-3 meters
Lateral length
• Maximum 50 meter from one end
• Submain - both flexible semi lay flat and rigid pipe
Uniformity standard
Uniformity of water distribution or emission
uniformity (EU) used as basic measurement to
measure the performance of drip irrigation
system
EU is dependent on the combined effect of
• Water supply head available
• Elevation differences throughout the
irrigated area
• Friction losses
• Discharge characteristics and
• Manufacturers coefficient of uniformity of
microtubes
 Coefficient of variation for uniformity
Measure of uniformity for post installation
evaluation of low cost microtube drip system
Recommended CVU values for low cost
microtube drip systems
• CVU above 88 % is excellent
• CVU between 88 % and 80% is good
• CVU between 88 % and 72% is fair
• CVU between 72 % and 62 % is marginally accepted
Low cost microtube drip lateral design
The system design tables developed on the basis
of following input variables
• Lateral inlet pressure head
• Microemitter spacing
• Lateral length
• Lateral drip tape inside diameter
• Minor loss due to the insertion of microtube
emitters into the drip tape (0.1 meter)
• Microtube emitter pressure head\discharge
relation curve
• Coefficient of variation of the microtube
emitter, based on bench test data
Row and vegetable microtube drip-tape hydraulic
design tables for laterals on zero slope
Inlet
Head,
HL (M)
Microtub
e
Spacing
Se (cm)
QL
(lpm)
qa
(lph)
hf
(m)
EUL
(%)
QL
(lpm)
qa
(lph)
hf
(m)
EUL
(%)
0.50
45
60
75
90
2.17
1.66
1.37
1.12
2.96
3.01
3.04
3.06
0.04
0.02
0.02
0.01
94
95
95
96
3.04
2.38
1.96
1.64
2.72
2.86
2.93
2.98
0.11
0.07
0.05
0.03
91
93
94
95
0.75
45
60
75
90
2.91
2.23
1.84
1.51
3.97
4.06
4.09
4.12
0.07
0.04
0.03
0.02
94
95
95
96
4.05
3.19
2.63
2.20
3.63
3.83
3.94
4.01
0.18
0.11
0.08
0.06
91
93
94
95
1.00
45
60
75
90
3.59
2.76
2.28
1.87
4.90
5.01
5.06
5.10
0.10
0.06
0.04
0.03
94
95
95
96
4.96
3.93
3.23
2.72
4.44
4.71
4.85
4.94
0.25
0.16
0.11
0.08
90
93
94
94
1.50
45
60
75
90
4.82
3.71
3.07
2.52
6.58
6.74
6.81
6.87
0.16
0.10
0.07
0.05
94
95
95
95
6.60
5.25
4.34
3.65
5.91
6.30
6.50
6.64
0.41
0.27
0.19
0.14
90
92
94
94
2.00
45
60
75
90
5.94
4.58
3.79
3.11
8.10
8.32
8.42
8.49
0.23
0.14
0.10
0.07
94
95
95
95
8.07
6.44
5.34
4.50
7.23
7.73
8.01
8.19
0.58
0.38
0.27
0.20
89
92
93
94
2.50
45
60
75
90
6.98
5.39
4.46
3.67
9.52
9.79
9.91
10.01
0.31
0.19
0.14
0.10
94
95
95
95
9.43
7.55
6.27
5.29
8.45
9.06
9.40
9.62
0.76
0.50
0.36
0.26
89
92
93
94
3.00
45
60
75
90
7.96
6.15
5.10
4.20
10.86
11.19
11.33
11.45
0.39
0.24
0.17
0.12
93
95
95
95
10.71
8.60
7.15
6.04
9.59
10.32
10.72
10.99
0.94
0.63
0.45
0.33
89
92
93
94
4.00
45
60
75
90
9.80
7.59
6.30
5.19
13.36
13.80
13.99
14.15
0.56
0.35
0.25
0.18
93
94
95
95
13.08
10.54
8.78
7.44
11.71
12.65
13.18
13.53
1.33
0.90
0.65
0.48
88
91
93
94
5.00
45
11.51
15.69
0.74
93
15.26
13.67
1.74
88
Lateral/Row Length 20 m
Latera/Row Length 30 m
Latera/Row Length 40 m
Latera/Row Length 50 m
Inlet Head,
HL (M)
Microtube
Spacing
Se (cm)
QL
(lpm)
qa
(lph)
hf
(m)
EUL
(%)
QL
(lpm)
qa
(lph)
hf
(m)
EUL
(%)
0.50
45
60
75
90
3.62
2.95
2.45
2.10
2.44
2.65
2.78
2.86
0.18
0.13
0.09
0.07
87
90
92
93
3.98
3.34
2.88
2.51
2.15
2.41
2.58
2.69
0.26
0.19
0.15
0.12
81
87
89
91
0.75
45
60
75
90
4.78
3.93
3.28
2.81
3.22
3.52
3.71
3.83
0.30
0.21
0.15
0.11
86
90
92
93
5.22
4.41
3.81
3.34
2.82
3.19
3.42
3.58
0.41
0.30
0.24
0.19
80
86
89
90
1.00
45
60
75
90
5.82
4.80
4.02
3.45
3.92
4.30
4.55
4.71
0.41
0.30
0.21
0.16
85
89
91
93
6.32
5.37
4.66
4.06
3.42
3.88
4.17
4.38
0.56
0.43
0.34
0.27
79
85
88
90
1.50
45
60
75
90
7.67
6.37
5.36
4.61
5.17
5.70
6.07
6.29
0.67
0.48
0.35
0.27
84
88
91
92
8.28
7.07
6.16
5.43
4.47
5.11
5.52
5.82
0.89
0.68
0.55
0.44
77
84
87
89
2.00
45
60
75
90
9.32
7.77
6.56
5.66
6.28
6.96
7.43
7.72
0.93
0.68
0.50
0.39
83
88
90
92
10.01
8.59
7.51
6.64
5.41
6.21
6.73
7.11
1.22
0.95
0.77
0.62
76
83
86
89
2.50
45
60
75
90
10.83
9.07
7.68
6.64
7.30
8.12
8.69
9.05
1.20
0.89
0.66
0.51
83
87
90
92
11.60
9.98
8.75
7.75
6.27
7.22
7.84
8.30
1.57
1.23
1.00
0.81
75
82
86
88
3.00
45
60
75
90
12.25
10.29
8.73
7.56
8.26
9.21
9.88
10.30
1.48
1.10
0.82
0.64
82
87
90
92
13.08
11.29
9.91
8.79
7.07
8.16
8.88
9.42
1.92
1.52
1.24
1.01
75
82
85
88
4.00
45
60
75
90
14.86
12.53
10.67
9.27
10.02
11.22
12.08
12.64
2.06
1.55
1.16
0.90
81
86
89
91
15.80
13.69
12.06
10.73
8.54
9.90
10.80
11.49
2.64
2.11
1.73
1.43
73
81
85
87
5.00
45
17.26
11.63
2.66
80
18.28
9.88
3.37
72