Design aspects of sprinkler irrigation system

Integrated Rural and Agricultural Development Association (IRADA), Satara
Online Training on
“Advanced Irrigation and Precision Agriculture”
DESIGNASPECTS OF SPRINKLER IRRIGATIONSYSTEMS
By
Er. R. M. Beldar
M. Tech. (Soil & Water Conservation Engineering)

2
Layout of Sprinkler System

What is Design of Sprinkler System ?
Selection of components of the Sprinkler irrigation
system to suit the water requirement of the crops and the
local field conditions.
Design of Sprinkler Irrigation System
Design Approach
 From Tail End to Head End
 From Sprinkler Selection to Pump Selection
3

Inputs required for Design
4
Topographical data Measurement of field, ground slope, contours
Water source
availability
Type of water source and Assessment of water
Agronomical details Crop, spacing, type, variety, age, water
requirement, crop physiology
Climatological data Temperature, humidity, rainfall, evaporation, etc.
Soil and water Collection of soil and water analysis samples and
analysis

Because, any or all of the following are different in different fields:
• Field Size and Shape
• Field Undulations
• Crops and Planting Patterns
• Water Quality issues
• Yield from Water Sources
• Location of water sources
• Soil Types
Why Sprinkler Irrigation Systems Need to be
tailor made to individual fields
5
• Crop rotations
• No of hours of electricity availability
• No of hours of labour availability
• Climatological variations
• Multiple cropping situations
• Quality of Farm Management

Guiding Principles for Selection of Sprinkler Irrigation
System Components
System Component/
Parameter
Guiding Principles in addition to cost-effectiveness
Sprinkler Discharge Available Water, Crop Water Requirements, Available
Operating Electricity hours.
Lateral pipe sizes and
lengths
Extent of field and desired Uniformity in water distribution
Filter Types Depending upon the water quality and type of sprinkler
selection.
Main and Submain Pipe
Sizes
Velocity of flow not to exceed 1.5 m/sec
Fertigation Equipment Fertilizer Tanks of capacity depending upon the crops and
area on each well
Irrigation Sectioning Depending upon the available water and electricity hours.
6

Design Consideration
1. Selection of sprinkler nozzle
2. Should have low discharge rate
3. Should have larger area coverage
4. Should required low pressure
5. Should be easy to install, clean and durable
6. Should have proper distribution pattern
7. Should be economical
8. Wind velocity
9. Overlapping 60 to 70 %
7

Design Procedure
1. Calculation of Crop Water Requirements
2. Selection of Sprinklers
3. Design of lateral pipes
4. Design and Selection of Sub-mains pipes
5. Design and Selection of Main lines
6. Selection of Filters & Fertilizer Equipments
7. Selection of Pump
8. Selection of other Fittings and Accessories
8

The depth of water needed to meet the water loss through evapotranspiration (ETcrop) of a
disease-free crop, growing in large fields under non-restricting soil conditions including soil
water and fertility and achieving full production potential under the given growing environment
Water requirement can be calculated as:
PWR For Widely Spaced Row Crop
PWR in mm/day = ET * Kc * Kp / IE
Where,
ET is evapo-transpiration (mm per day)
Kc is crop factor,
Kp is canopy factor,
IE Sprinkler irrigation efficiency 80%
OR
Volume of water for Row crops :
Volume of water for required per unit area per day: Net depth of water x Kc x % wetted Area water
covered by foliage
Calculation of Peak Water Requirement of Crop
9

Crop Water Requirement Calculations
S.No. Particulars Unit Code June July August Sept Oct Nov Dec
Total for
year
1
Average Rainfall in mm of
Rain guage station
mm Re 102 138 129 171 105 37 8 764
2 Dependable Rainfall mm Rd 55 69 66 80 56 0 0 326
3
ETO from Nalgonda in
the month
mm Eto 176.00 151.00 157.00 160.00 171.00 148.00 140.00 2119
1 Ground Nut(SIS) Eff 80% June July August Sept Oct Nov Dec 0.00
Length of crop season days 31 31 30 31 123.00
Crop Factor factor 0.5 0.8 0.9 1
Canopy Factor factor 0.4 0.7 0.8 0.9
Crop Evapotranspiration- mm Etc 30.20 87.92 115.20 153.90 387.22
Net Water Requirement mm NWR 0.00 21.92 35.20 97.90 155.02
Gross Water Requirement mm GWR-D 0.00 27.40 44.00 122.38 193.78
Gross Water Requirement mm/day GWR-D 0.00 0.88 1.47 3.95
Calculations of Water Requirements(Crop Evapotranspiration)
Data Used for Calculation of Crop Evapotranspiration
Crop Evapotranspiration of Recommended Crops
10

2. Selection of Sprinkler
1.Types of sprinkler
2.Discharge of sprinkler
3.Radius of coverage
4.Pressure requirement
5.Sprinkler to sprinkler spacing(SSP)
11

2. Selection of Sprinkler
--------------------------------------------------------------------------------------------------------
Selection Factor Type of Sprinkler
--------------------------------------------------------------------------------------------------------
1. Type of Crop : Vegetable
2. Water Requirement : 3.95 mm/day
3 Selected Model : 5022-U Model of Sprinkler
4. Sprinkler Spacing : 10m x 10m spacing at 2.5 kg/cm2
5. Operating Pressure : 2.5kg/cm2
6. Discharge Of Sprinkler : 520LPH at 10m x 10m spacing at 2.5kg/cm2
12

Sprinkler Precipitation rate
Volume Precipitation Rate (mm/hr)
Low Upto 13
Medium Between 13-25
High Above 25
13
• Selection of sprinkler depends on infiltration rate of a soil.
• Sprinkler precipitation rate should be always less than the infiltration
rate of soil to avoid runoff.

Deciding the sprinkler spacing
Wind condition Sprinkler spacing
No wind 0.65 x Dia. of throw
Low 0.60 x Dia. of throw
High 0.50 x Dia. of throw
14
• Sprinkler to Sprinkler depends upon diameter of coverage of
sprinkler and wind velocity.
• Condition SSP = 50 % to 70 % of diameter of throw (D)
= (0.5D to 0.7D)

Performance of overhead and micro Sprinkler
15

16

17
WATER APPLICATION RATE
WAR (mm/hr) = discharge of sprinkler/ (Sprinkler to Sprinkler spacing)2
Where,
Q = discharge of sprinkler in lph
SSP= Sprinkler to Sprinkler spacing meter
Irrigation Time
No. of Irrigation Section
( )hr=
WAR
PWR
=TimeIrrigation
TimeIrrigation
AvailableyElectricit
tionIrrigationofNo sec.

18
No of Shift possible = Hrs. of Pumping/ Irrigation Time
No. of Sprinkler in one shift = Total Sprinkler/ No. Shift
No. of Shift = Total no sprinkler / No. of sprinkler in one shift
Application rate mm/hr = Total discharge of all sprinkler (m3/hr) x 1000
Total Area (m2)
OR
Application rate mm/hr = Total discharge of all sprinkler (m3/hr) x 1000 x 360
Degree of arc x head spacing(m) x row spacing (m)

3. Selection & Design of Laterals (Polytube)
- Material LLDPE (Linear Low Density Polyethylene)
- Diameter of Lateral
Size 12 mm, 16 mm, 20 mm, 25 mm, 32 mm.
- Length of Lateral to be run : depends on
SDR – Specific Discharge Rate (lph/m).
Topography.
Limiting frictional head loss and design tolerance of
sprinkler. (up to 2m)
19

3. Selection & Design of Laterals (Polytube)
Calculate SDR – Specific Discharge Rate (lph/m).
spacingSprinkler
edischSprinkler
lateralofSDR
arg

From the SDR Curves for ____ mm and ____ mm laterals it can be seen
that- For the SDR = ____ lph/m the lateral of ____ mm can serve to run a
length of ____ m.
We select ____ mm diameter lateral. (hf= ____ m)
20

Advanced Irrigation and Precision Agriculture
21

Selection Chart of 32mm Lateral of ID 28mm
22

4. Selection & Design of Submain
-Material: PVC or HDPE.
-Size 40 mm, 50 mm, 63 mm, 75 mm, 90 mm.
-SDR – Specific Discharge Rate (lph/m).
-Topography.
- Deciding length by limiting frictional head
loss and design tolerance. (up to 2m)
23

4. Selection & Design of submain
For submains, the frictional loss is given by Hazen-Williams Formula
Lx
D
Q
35.5h 871.4
852.1
f 






hf = total energy drop by friction at the end of sub-main
Q = total discharge at the end of sub-main in lit/sec
D = internal diameter of pipe in centi metre
L = length of pipe in metre,
C = Hazen-Williams constant (friction factor)
= 150 assumed for PVC/HDPE
s/mofLength
dischargesprinklerxs/mbycoveredsprinklersofNo.
m/ofSDR s
24

4. Selection & Design of submain
s/mofLength
dischargeSprinklerxs/mbycoveredSprinklersofNo.
m/ofSDR s
From the SDR Curves for ____mm diameter s/m pipes (hf= 0.8 m)
25

Selection Chart of 50mm Submain Pipe of ID 46.7mm
26

Selection Chart of 63mm Submain Pipe of ID 59mm
27

Selection Chart of 75mm Submain Pipe of ID 71mm
28

5. Selection & Design of Main :
- PVC or HDPE.
- Size 50 mm, 63 mm, 75 mm & above
- Deciding operation schedule.
- Ground elevation.
- Calculating frictional head loss by Hazen-
Williams Formula.
Lx
D
Q
hf 





 871.4
852.1
35.5
29

5. Selection & Design of Main
From the Graph of Friction loss in PVC main line it can be seen
that –
Selection is based on
1. Velocity should be within 1.5m/sec.
2. Frictional loss try to limit up to 20m/1000m length
For the flow of ____lps, the ____ mm diameter main line will have
a head loss of ____m per 1000m. So for a length of ____ m main
line the head loss will be = ____x____/1000 = _____m.
Hence suggested _____mm Mainline.
30
sec/44.1
3600
52010
3600
dischargesprinklerxs/mbycoveredsprinklersofNo.
m/F
lit
x
sinlow



31

32

Design Drawing
33

5. Design and Selection of Pump
• Suction Head : Vertical distance between water
level to centre of pump
• Delivery Head : Vertical distance between centre
of pump to ground level
• Filtration Losses : Frictional head losses in different types of
filters. It is assumed 2 m for each type of filter
• Lateral and submain : Frictional Losses between lateral & submain.
• Main Line Losses : Frictional head losses occur in main line
• Operating Pressure : Operating pressure of sprinkler selected as 25m
• Fittings Losses : Loss in fittings like Bends, Elbows, Tees,
Reducers and Valves etc. and is assumed to be
2 m overall.
• Ventury Head : Pressure required to operate the ventury or
fertilizer applicator and is assumed to be 3 m.
• Elevation : Vertical distance between ground level near to
water source to the highest level of ground
34

Horse Power Calculation
H.P. = -------------------
Q X H
75 X Ep X Em
Where, Q = Required discharge (lps)
H = Required total head (m)
a = Efficiency of motor (assumed 85%)
b = Efficiency of pump (assumed 80%)
35

Hfsd Head Loss in suction & delivery (assumed) m
Hfl Head Loss in Lateral Pipe m
Hfs Head Loss in Submain Pipe m
Hfm Head Loss in Main Pipe m
Hfil Head Loss in Filter m
Hfer Head Loss in Fertigation m
Ho Operating Head m
Hele Head Loss Due To Elevation (assumed) m
Hfit Head Loss In Fittings m
H Total Head m
Q Total Flow lps
Ep
Efficiency of Pump
Em
Efficiency of Motor
Required Pump H.P HP
Say HP
5. Design and Selection Of Pump
36

• One limitation is effect of wind. But it can minimized by carefully
planned distribution pattern.
• Sprinkler system requires little but high investment than
conventional system but benefits are also higher side than
conventional system.
• Power requirement is higher side so that operating pressure starts
from 2.5kg/cm2. But overall consumption is less than conventional
system.
Limitations Of Sprinkler Irrigation System
37

Preparation Of BOQ For Sprinkler Irrigation System
S.No. DESCRIPTION Qty Unit
1 PVC PIPE 63 MM x 4Kg/cm2 m
2 PVC PIPE 50 MM x 6Kg/cm2 m
3 LATERAL 32 MM m
4 Mini Sprinkler Model for 10 x 10 no.
5 Zinc Plated M S Rod 8mmx 1.2 M Length no.
6 Extension Tube 12mm PVC Mtr
7 Male Connector 8 mm no.
8 Female Connector 8 mm no.
9 M & F Adoptor 1/2" no.
10 CONTROL VALVE 32MM no.
11 CONTROL VALVE 50 MM no.
12 FLUSH VALVE 50MM no.
13 Air release Valve 1" no.
14 Non Return Valve 2" no.
15 Throttle Valve 2" no.
16 SCREEN FILTER 20/25 M3/HR no.
17 BY PASS ASSEMBLY - 2" no.
18 VENTURY & MANIFOLD (2") no.
19 Service Saddle 50 x 32 no.
20 PP/compression Threaded Tee 32 mm no.
21 Compression Adoptor 32 mm no.
22 Compression End Plug 32 mm no.
23 Coupler/ Joiner 32 mm no.
24 Fittings & Accessories
38

Design of Mini Sprinkler Irrigation System
Design Example For Mini
Sprinkler System
Design a Mini Sprinkler irrigation system for
1 ha nursery of Mulberry Plot (Mini Sprinkler
Spaced at 2.5m x 2.5m).
39

Crop coefficients and Canopy factors of some important crops.
40

Step1- Crop Water Requirement Calculations
E
CxBxA
PWR 
PWR = Peak Water Requirement, mm/day
A = Reference Evapotranspiration, 7 mm/day
B = Crop factor (1)
C = Canopy factor (0.95 = 1)
E = Irrigation Efficiency (0.8 for Mini Sprinkler)
daymm/75.8
.8
1x1x7
PWR 
41
0

42
Layout of micro sprinkler for mulberry crop

43
Selection of micro sprinkler
Condition- sprinkler spacing should be in between 0.5D to 0.7D
1. For nozzle size 0.65 mm and color code-Black
Q= 16 lph and diameter of throw D = 2.4 m
= 0.5 x 2.4 to 0.7 x 2.4
= 1.2 m to 1.68 m
condition is not satisfy
2. For nozzle size 1.12 mm and color code-Green
Q= 44 lph and diameter of throw D = 4.2 m
= 0.5 x 4.2 to 0.7 x 4.2
= 2.1 m to 2.94 m
Condition is satisfy
Hence we select 2.5 m sprinkler to sprinkler spacing.

--------------------------------------------------------------------------------------------------------
Selection Factor Particulars
--------------------------------------------------------------------------------------------------------
1. Type of Crop : Nursery Mulberry
2. Water Requirement : 8.75 mm/day
3 Selected Model : Use JISL Mini sprinkler Performance Chart
4. Sprinkler Spacing : 2.5 m x 2.5 m
5. Operating Pressure : 1.0 kg/cm2
6. Discharge Of Sprinkler : 44 LPH and 4.2m dia. Of throw at 1.0 kg/cm2
Step2- Design & Selection of Mini Sprinkler
44

Performance of Mini Sprinkler
45

Design of Mini Sprinkler Irrigation System
spacingSprinklerxSpacingSprinkler
fieldentireofArea
SprinklersofNo  Sprinklers1600
2.5x2.5
100x100

spacingSprinklerxspacingSprinkler
DischargeSprinkler
WAR 
2.5x2.5
44
 mm/hr7.04
Step3 - Water Application Rate
Step4 – Irrigation Time
hours1.24
7.04
8.75
WAR
PWR
TimeIrrigation  = (1hr and 14 min.)
46
sections6
1.24
hours8
possiblesectionsirrigationofNo. 
Irrigation Scheduling:
Irrigate in 4 sections.
Operate each section for 1.24 hours.

Step 5 – Design and Selection of Lateral
SpacingSprinkler
DischargeSprinkler
LateralofSDR 
5.2
44
 mperlph17.6
From SDR curves, we have the maximum running length of lateral,
12mm Ф = 18m
16mm Ф = 25m
We select 16mm Ф lateral to run 25 m length.(hf = 1.1 m)
47

48

Step 6 – Design and Selection of Submain
SubmainofLength
DischargeSprinklerxSprinklerofNo.
SubmainofSDR 
50
44x400
 mperlph352
From SDR curves, we have the maximum running length of submain,
50mm Ф = 57 m
63mm Ф = 103 m
We select 63 mm Ф, class II (4 kg/cm2) submain line run up to 50
m(hf = 1.4 m)
49
SDR for one submain

50

51
Secti
on
S/M
nos.
Lengt
h of
S/M
(m)
Ares
covered
by s/m
(m2)
No. of
Sprinkler
covered by
s/m
SDR of S/m
(SD x NS ) /
Length of
s/m
Dia.
(mm
)
Cla
ss
Hf
(m)
Flow =(
SDx NS)
/ 3600
(l/s)
Sectio
nal
Flow
I 1 50 2500 400 352 63 II 1.4 4.88 4.88
II 2 50 2500 400 352 63 II 1.4 4.88 4.88
III 3 50 2500 400 352 63 II 1.4 4.88 4.88
IV 4 50 2500 400 352 63 II 1.4 4.88 4.88
10000 1600 19.52
Max. Sectional flow (lps) 4.88
Submain Table

Step 7 – Design and Selection of Mainline
From Graph, for flow of 4.88 lps,
Flow of submain line = flow of main line
We select, 90 mm dia, class II (4kg/cm2 ) main line.
Frictional head loss = 10m/1000m
3600
dischargeSprinklerxSprinklersofNumber
SubmaininFlow 
3600
44x400
 lps4.88
52

Selection Chart of Main Line
53

54
1 2 3 4 5 6 7 8 9 10 11 12
Secti
on
S/
m
no
s.
From To
Length
of main
line (m)
Flow =(
SDx NS) /
3600 (l/s)
Sectional
Flow
Dia.
(mm)
Clas
s
Hf
m/1000
Actual Hf
s/m x 1000
(5 x 10)
Sectional
Hf
I 1 s/m 1
W
S
125 4.88 4.88 90 II
10/
1000
125 x (10/ 1000)
1.25
II 2 s/m 2
W
S
75 4.88 4.88 90 II
10/
1000
75x (10/ 1000)
0.75
III 3 s/m 3
W
S
75 4.88 4.88 90 II
10/
1000
75 x (10/ 1000)
0.75
IV 4 s/m 4
W
S
25 4.88 4.88 90 II
10/
1000
25 x (10/ 1000)
0.25
Max. head loss in mainline 1.25
Main line Table

Step 8 – Selection of Filter Capacity
• Filter Capacity (m3/hrs.) = 3.6 x Flow of main line (Q)
Filter Capacity = 3.6 x 4.88 = 17.56 m3/hrs.
Source – Open Well
Select Sand Filter (J-Filtro Master) 1.5’’ x 2’’, 20 m3/hrs.
single with plastic manifold and Manual back washing.
Select Screen filter (J- super flow filter) 20 m3/hrs. of 1.5’’
inlet.
Ventury Selection
MF = 4.88 / 3= 1.62 l/s
Select ventury complete assembly 1’’
55

Hfsd Head Loss in suction & delivery (assumed) 10 m
Hfl Head Loss in Lateral Pipe 1.1 m
Hfs Head Loss in Submain Pipe 1.4 m
Hfm Head Loss in Main Pipe 1.25 m
Hfil Head Loss in Filter 5 m
Hfer Head Loss in Fertigation 5 m
Ho Operating Head 10 m
Hele Head Loss Due To Elevation (assumed) 0 m
Hfit Head Loss In Fittings 2 m
H Total Head 35.75 m
Q Total Flow 4.88 lps
Ep Efficiency of Pump 80 %
Em Efficiency of Motor 85 %
Required Pump H.P 3.42 HP
Say 5 HP
5. Design and Selection Of Pump
56

Total Head, H = Suction + Delivery head + Filter loss + Head
loss in Main-Submain-Lateral pipe + Operating Pressure of Sprinkler +
Fittings (Valves, Elbow, Tee, Bend, Reducer etc.) + Ventury loss+
Elevation (ground slope)
H = 10+ 5 + (1.25 + 1.4 + 1.1) + 10 + 2 + 5 + 0
H = 35.75 m
4.88 x 35.75
HP = -------------------------------- = 3.42 HP = 3.5 HP
75 x 0.80 x 0.85
57
Step 9 – Pump Selection
H.P. = -------------------
Q X H
75 X Ep X Em

58
Technical Diagram
100 m
PVC90mmODClassII
PVC63mmODClassII
Sand Filter
Screen FilterPumpWS
100m
I
II
IIIIV
16 mm dia.

S. No Item Code Description of Item Quantity Unit Rate Amount
(Rs.)
1 PVC Pipe 90 mm φ , II (4 Kg/ cm2) as per IS:4985 126 m
2 PVC Pipe 63 mm φ , II (4 Kg/ cm2) as per IS:4985 204 m
3 Jain Tough hose poly tube lateral 16 mm φ 5700 m
4 Grommet Take Off 16 mm φ 170 Nos
5 End Stop ‘O’ Shape 16 mm φ 170 Nos
6 Tee barbed 16 mm φ 1600 Nos
7 Mini Sprinkler of 44 lph @ R=2.5 m 1600 Nos
8 Stake for mini sprinkler, 16 mm 1600 Nos
9 Ball Valves 63 mm φ 4 Nos
10 Flush Valves 63 mm φ 4 Nos
11 Sand Filter 20 m3/hr (2”) with metal manifold 1 No
12 Screen Filter 20 m3/hr (11/2”) 1 No
13 Air Release Valve (1”) 1 No
14 By Pass Assembly (3” x 2.5”) 1 No
15 Air Release Valve Assembly 1 No
16 PVC Bend 63 mm φ 12 Nos
17 PVC Tee 90 mm φ 5 Nos
18 GI Nipples (2”) 6 Nos
19 GI Pipes (2.06) 6 Nos
20 GI Socket (2”) 4 Nos
21 GI Elbow (2”) 3 Nos
22 GI Pipe (2.012) 4 Nos
23 PVC Elbow 75 mm φ 1 No
24 PVC Reducer 90 x 63 1 No
25 PVC Reducer 90 x 75 1 No
26 Poly Poly Joiner, 16mm 20 No
Bill of Quantity
59

Online Training on
“Advanced Irrigation and Precision Agriculture”
Design of Overhead sprinkler system
By
Er. R. M. Beldar

Design Example For
Overhead Impact Rotary
Sprinkler System
Design a Overhead Sprinkler irrigation
system for 1 ha
61

DESIGN OF OVERHEAD SPRINKLER
The system should be portable.
• Given Data:
• Source : Well
• Crop: Maize
• Area = 100 x 100 m = 1 hectare
• BGL = 6 m
• EA= 10 hr.
62

Step1- Crop Water Requirement Calculations
E
CxBxA
PWR 
PWR = Peak Water Requirement, mm/day
A = Reference Evapotranspiration, 7 mm/day
B = Crop factor (1)
C = Canopy factor (0.95 = 1)
E = Irrigation Efficiency (0.8 for Mini Sprinkler)
daymm/75.8
.8
1x1x7
PWR 
63
0

Step 2 Selection of Sprinkler
`
64
Note: x = end distance (ED)

65
100m
100 m
8m
8m
8m
8m
8m

• Select JIS-2 Model of Overhead Sprinkler,
• Discharge, Q=34 lpm and Radius R = 12 m at 2.5 Kg/cm2
• Dia. of Throw = 24 m
66

Step- 3) Selection of Sprinkler Spacing
• Condition - 0.5 D to 0.7 D
= 0.5 x 24 to 0.7 X 24
= 12 m to 16. 8 m
Sprinkler Spacing must be multiple of 6 m. (one QC Pipe
length)
Select 12 m as Sprinkler Spacing.
67

Step 4- Calculation of WAR
68

Step 5- Calculation of Irrigation Time
69
Step 6- Consideration of Shifting Time
Assume shifting time = 23 min

Step 8 – Calculation of no. of irrigation shift
• Total time for one shift = irrigation time + shifting time
= 37 + 23
= 60 min (1 hr.)
70
Step 7 – Calculation of Total Time For One Shift
• No. of Irrigation Shift = Electricity available
Time for one Shift
= 10/1
= 10 Shifts

Step 9- No of Division
• No. of Division = Total length – 2 x (end distance)
Sprinkler spacing
= 100 - 2 x 8
12
= 7 Nos.
• Number of sprinkler = 1 + No. of Divisions
= 1 + 7 = 8 Nos.
• Length of Side = 2 x end distance + No of divisions x Sp.spacing
= 2 x 8 + 7 x 12 = 100 m
71

Step 10- Design of Submain
72
SDR of Submain = 8 x 34 x 60
92
= 177.39 lph/m
For SDR curve select 63 mm Dia. QC pipe (hf=1.2 m) as Submain

Step 11- Design of Main Line
73

Step 12- Selection of Filter
74
1000
3600
xFlowcityFilterCapa 
1000
3600
x4.53
/hrm16.308 3

Use filter of capacity 20 m3/hr

Step 13 Selection of PUMP
75
Total Head Calculation:
Suction + Delivery = 6 m
Filter Losses = 2.5 m
Fitting Losses = 2 m
Operating Pressure = 25 m
Main Line Losses = 1.7 m
Submain Line Loss = 0.9m
Ventury head = 5 m
Riser pipe head = 1m
Total Head Loss, H = 44.5 m
Pump Selection
.effx75
HxQ
H P
0.6x75
46.1x4.53

HP54.48 

76
100m
100 m
QC pipe 75 mm dia. II
QCpipe63mmdia.II
8m 8m
Overhead sprinkler
Radius 12 m

Thank You
77

Design aspects of sprinkler irrigation system

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