Lecture 24
Hydraulic Design of Mainline & Supply Line
I. Introduction
Chapter 24 of the textbook contains a good summary and discussion of the
design process for trickle irrigation systems
Keller & Bliesner divide the trickle irrigation design process int

Lecture 7
Set Sprinkler Lateral Design
I. Basic Design Criterion
The basic design criterion is to size lateral pipes so that pressure variation
along the length of the lateral does not exceed 20% of the nominal design
pressure for the sprinklers
This crit

Lecture 8
Set Sprinkler Lateral Design
I. Dual Pipe Size Laterals
Sometimes it is useful to design a lateral pipe with two different diameters to
accomplish either of the following:
1. a reduction in hf
2. an increase in hf
In either case, the basic objec

Lecture 9
Mainline Pipe Design
I. Split-Line Laterals
Laterals are usually distributed evenly along a mainline because:
More equal pump load at different lateral positions
Reduced mainline cost
Dont need to dead-head back when finished (cross over to othe

Lecture 10
Minor Losses & Pressure Requirements
I. Minor Losses
Minor (or fitting, or local) hydraulic losses along pipes can often be
estimated as a function of the velocity head of the water within the particular
pipe section:
hml
V2
= Kr
2g
(208)
where

Lecture 11
Pumps & System Curves
I. Pump Efficiency and Power
Pump efficiency, Epump
Epump =
water horsepower W HP
=
brake horsepower BHP
(221)
where brake horsepower refers to the input power needed at the pump shaft
(not necessarily in horsepower; could

Lecture 12
Center Pivot Design & Operation
I. Introduction and General Comments
Center pivots are used on about half of the sprinkler-irrigated land in the USA
Center pivots are also found in many other countries
Typical lateral length is 1,320 ft (400 m)

Lecture 15
Maximizing Linear Move Field Length
I. The Procedure
The following procedure for maximizing field length is from Allen, 1983, Univ.
Idaho and Allen, 1990 (Irrig. Symp. Paper), and is used in the USUPIVOT
computer program
The basic strategy is t

Lecture 14
Center Pivot Uniformity Evaluation
I. Introduction
The calculation of an application uniformity term must take into account the
irrigated area represented by each catch container
It is more important to have better application uniformity furthe

Lecture 16
Trickle Irrigation System Components & Layout
I. Introduction and Descriptions
Trickle and drip are terms used to describe what can be generally called
micro-irrigation systems, in which water is applied in relatively precise
quantities and pre

Lecture 13
Center Pivot Nozzling
I. Center Pivot Nozzling
The wetted width of the application package can be reduced closer to the
pivot point because the towers are moving at a slower speed at inner points;
therefore, the application intensity (AR) is le

Lecture 17
Filtration for Trickle Irrigation Systems
I. Introduction
Water for trickle irrigation systems can
come from open reservoirs, canals, rivers,
groundwater, municipal systems, and other
sources
Solid contaminants can include both organic
and inor

Lecture 18
Trickle Irrigation Planning Factors
I. Soil Wetted Area
Trickle irrigation systems typically apply small amounts of water on a
frequent basis, maintaining soil water near field capacity
But, usually not all of the soil surface is wetted, and mu

Lecture 19
Water Requirements in Trickle Irrigation
I. Trickle Irrigation Requirements
1. Daily Use Rate
The daily transpiration rate under a trickle system is based on Ud and the
percent area shaded (covered) by the plant leaves. Eq. 19.9:
Td = 0.1 Ud Pd

Lecture 20
Emitter Selection & Design
I. Introduction
There are hundreds of models, sizes and types of emitters, sprayers,
bubblers, and others, available from dozens of manufacturers
Prices of emitters can change frequently
Some emitters have longer life

Lecture 21
Pipe Specifications & Trickle Lateral Design
I. Plastic Pipe Specifications
Trickle and sprinkle irrigation systems are
commonly built with plastic pipe, of which there
are various types and specifications
It is important to understand how the

Lecture 22
Numerical Solution for Manifold Location
I. Introduction
In the previous lecture it was seen how the optimal manifold location can be
determined semi-graphically using a set of non-dimensional curves for the
uphill and downhill laterals
This lo

Lecture 6
Economic Pipe Selection Method
I. Introduction
The economic pipe selection method (Chapter 8 of the textbook) is used to
balance fixed (initial) costs for pipe with annual energy costs for pumping
With larger pipe sizes the average flow velocity

Lecture 5
Layout of Laterals for Set Sprinklers
I. Selecting Sprinkler Discharge, Spacing, and Pressure
In Chapter 6 of the textbook there are several tables that provide guidelines
for nozzle sizes for different:
Wind conditions
Application rates
Sprinkl

BIE 5110/6110
Sprinkle & Trickle Irrigation
Fall Semester, 2004
Assignment #1 (100 pts)
Due: 15 Sep 04
Given:
Data for a field in Cache Valley, Utah:
Crop=
Topsoil=
Topsoil depth (m)=
Subsoil=
Subsoil depth (m)=
Field area (ha)=
MAD (%)=
Irrigation water

BIE 5110/6110
Sprinkle & Trickle Irrigation
Fall Semester, 2004
Assignment #2 (100 pts)
Due: 29 Sep 04
Given:
A solution for the economic selection of pipe sizes is needed. The solution is to be
based on the following data:
interest rate, i = 2.4%
inflati

BIE 5110/6110
Sprinkle & Trickle Irrigation
Fall Semester, 2004
Assignment #4 (100 pts)
Mainline Design
Due: 13 Oct 04
Given:
A large rectangular field, 1,200 m long and 1,000 m wide
Periodic-move sprinkler laterals with buried mainline pipe
Four sprinkle

BIE 5110/6110
Sprinkle & Trickle Irrigation
Fall Semester, 2004
Assignment #5 (100 pts)
Minor Losses & Pumps
Due: 13 Oct 04
Given:
A rectangular field to be sprinkler irrigated
There will be four laterals, two on each side of the mainline
All of the perio

BIE 5110/6110
Sprinkle & Trickle Irrigation
Fall Semester, 2004
Assignment #6 (100 pts)
Pump Characteristic Curves
Due: 20 Oct 04
Given:
A graph of pump characteristic curves for Cornell Model 4HS
Notice the abscissa scale and the note saying that the pum

BIE 5110/6110
Sprinkle & Trickle Irrigation
Fall Semester, 2004
Assignment #7 (200 pts)
Operating Point for Fixed Sprinkler System
Due: 29 Oct 04
Given:
A fixed sprinkler system (all sprinklers operate simultaneously) in an orchard.
Buried IPS-PVC 1- late

BIE 5110/6110
Sprinkle & Trickle Irrigation
Fall Semester, 2004
Assignment #8 (100 pts)
Trickle System Design Calculations
Due: 01 Dec 04
Do you work in an organized, neat way. Write down any assumptions you make.
Given:
A mature walnut orchard will be dr

BIE 5110/6110
Sprinkle & Trickle Irrigation
Fall Semester, 2004
Assignment #9 (100 pts)
Trickle Manifold Location
Due: 3 Dec 04
Given:
A rectangular field of orchard trees, 550-m long in the direction of the PE laterals. The
preliminary design data are as

BIE 5110/6110
Sprinkle & Trickle Irrigation
Fall Semester, 2004
Assignment #10 (100 pts)
Trickle Manifold Pipe Sizing
Due: 13 Dec 04
Given:
A trickle irrigation system with a manifold inflow rate of 5.00 lps.
An allowable subunit pressure head variation o

BIE 5110/6110
Sprinkle & Trickle Irrigation
Fall Semester 2004 Exam #1
Include units in all results. Indicate any assumptions that you might make.
Name_
1. Preliminary Design Calculations (25 pts)
Almonds (deciduous trees, with no cover crop) have been pl

BIE 5110/6110
Sprinkle & Trickle Irrigation
Fall Semester 2004 Exam #2
Include units in all results. Indicate any assumptions that you might make.
Dont show more than three significant digits in the results.
Name_
1. (60 pts) Two gun sprinklers are suppli