This document discusses the layout and design of drip irrigation systems. It describes the key steps in the design process, which include collecting data on water resources, land, climate and crops. It also covers computing peak crop water requirements, selecting appropriate emitters, and hydraulically designing the pipe network and determining the required pump horsepower. The document provides examples of different drip irrigation system layouts and considerations for selection of emitters and arrangement along laterals. It aims to explain how to plan and design drip irrigation systems for uniform crop irrigation while minimizing costs.

1. A Title of Your
Presentation
Delivered by
Integrated Rural and Agricultural Development Association (IRADA),
Satara
Online Training on
“Advanced Irrigation and Precision Agriculture
Layout of Drip Irrigation Technique
Er. A. N. Gaupale
M. Tech. (Irrigation and Drainage Engineering)

2. Integrated Rural and Agricultural Development Association (IRADA), Satara
Advanced Irrigation and Precision Agriculture 2
WHY PLANNING AND DESIGN OF DIS
Uniformly Irrigated Crop
Minimize Cost Of System
 Design Of DIS Consists:
*Selection Of Emitters
*Size Of Laterals
*Manifolds
*Sub Main
*Main Pipeline
*Filter
*Pump

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Advanced Irrigation and Precision Agriculture 3
STEPS FOLLOWED FOR DESIGNING THE DIS :
1. Inventory of the resources and data collection
2. Computation of peak crop water requirement
3. Deciding the appropriate layout of the drip
irrigation system
4. Selection of emitters
5. Hydraulic design of the system in terms of lateral, sub main and main
6. Horse power requirement of pump

4. Integrated Rural and Agricultural Development Association (IRADA), Satara
Advanced Irrigation and Precision Agriculture 4
INVENTORY OF THE RESOURCES AND DATA COLLECTION
Water Resources
Land Resources
Climate
Crop

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COMPUTATION OF PEAK CROP WATER REQUIREMENT
It is a function of plants, surface area covered
by plant, evapotranspiration rate.
 CWR is calculate for each plant then estimate for whole area.
CWR is maximum during any seasons is adopted for system design.
Kc varies with crop growth stage and season.

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Name of the
Crop Spacing (m)
Water
requirement
(l/plant/day)
Minimum Maximum
Banana 2.0 × 2.0 4 18
Papaya 2.0 × 2.0 2 10
Guava 5.0 × 5.0 14 39
Mango 5.0 × 5.0 20 50
Pineapple 0.45 × 0.25 0.1 0.6
Cashew 7.5 × 7.5 25 60
Tomato 0.6 × 0.6 0.45 1.15

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Daily Water Requirement
Net Volume Of Water To Be Applied
Nob. Of daily operating hr
Q = A x B x C x D

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LAYOUT OF THE DRIP IRRIGATION SYSTEM
 Nob. Of subunits = Total time Available for irrigation/ Time of operation
for drip system.
Total time available for irrigation depends on the hours of electricity
available in the region
If discharge for the individual sub unit is more than the available discharge
then the area is proportionally reduced to match the required discharge
Sub main run along the slope and lateral across the slope or along the
contour line

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DIFFERENT LAYOUTS DESIGN OF MICRO IRRIGATION SYSTEM

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DIFFERENT LAYOUTS DESIGN OF DRIP IRRIGATION SYSTEM
1.Center-Feed Layout

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2. End-Feed Layout

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3. Edge Conditions

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4. Light Layout

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5. Elevation Changes

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6. Small Planters

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7. Trees

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SELECTION OF EMITTERS
Soil
Crop
Topography
Emission Uniformity
Discharge Available
Water use Efficiency
Water Quality

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Different Arrangement Of Emitters Along The Laterals

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HYDRAULIC DESIGN OF PIPE NETWORK
1. Know the operating pressure of emitters
2. Find out the allowable head loss in lateral and sub main
3. Find out the lateral and sub main discharge
4. Find out the diameter and length of the lateral such that the head loss in the lateral is within allowable
limits for the given layout.
5. Repeat the procedure for the sub main
6. Find out the diameter of main so that the velocity is within the allowable
limit or find out the head loss in main for the specified diameter of the main.

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HORSEPOWER REQUIREMENT OF PUMP
where,
H = Total pumping head (Hf + He + HS), m
Hf = Total head loss due to friction (Friction head loss in mains + Friction head loss in
sub mains + Friction loss in laterals + Head loss in accessories, filters and fertigation
unit), m
He = Operating pressure head required at the emitter, m
HS = Total static head, m
Qm = Discharge of main
hp = Efficiency of pump
hm = Efficiency of motor

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