Center Pivot Design Presented by the Irrigation Association

Center Pivot Design Presented by the Irrigation Association

Class Objectives • You will be able to design a center pivot system by the end of class • You will understand the proper steps and techniques for designing pivots for high efficiency

Agenda - day one • • Introductions and class overview Basic pivot concepts Site inventory and analysis Pivot hydraulics

Agenda - day two • • • More pivot hydraulics Nozzling the pivot Pumps and pivots Pivots and chemigation Refining and adjusting your design

Other class info • Ask lots of questions • Breaks will be frequent but short please! • There will be coffee in the a. m. and soft drinks in the p. m. • Lunch on your own • We will be doing lots of practice sessions and group work

Important! • Please turn off your pagers and cell phones • You will need a calculator • You will need a pencil or pen

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Understanding Basic Pivot Concepts

Understand Identify Center Pivot Components • • Drive system Guidance system The pivot Nozzle types and configurations

Understand Identify Center Pivot Components • Corner systems • Controls • Injection equipment

Back to the Beginning l l Patented by Frank Zybach in eastern Colorado in July, 1952 Business arrangement between Zybach and A. W. Towbridge began in 1953 to manufacture pivots in Columbus, NE Manufacturing rights sold to Valley Mfg. In 1954 Over 100, 000 now in operation

Valley - Model 1972

Hygromatic Raincat Olson Dowd

Center Pivot Manufacturers • Reinke • T&L • Valley • Zimmatic May also deal with Olson, Gifford-Hill, Lockwood, Pierce, Hygromatic, Raincat, and others.

You want to irrigate it center pivots can be designed to do the job

Multi-Purpose Machines Wetland enhancement Wildlife habituate Watering facility

Land Mark for NASA

Making Center Pivots Work Properly • • Minimize run-off Maximize uniformity Minimize energy costs Where pivots don’t fit

We will discuss how to use soil texture and topography information

Instantaneous Application Rates Above Soil Infiltration Rates

Irrigating Irregular Field Shapes

Pivots Operate on Undulating Terrain

How do we plan for wind?

Pressure Regulation

Spacing and Overlap

Distribution and application

Time of Application Peak Application Rate Initiation Time Raingage End Time

Lets look at some system components Look for definition of terms starting on Page 297

Pivot base

Center Pivot Lateral

End Tower and Super Structure

Pivot Height • Four Profiles – Low profile 5. 1 - 7. 2’ depends on pipe size – Standard Profile 8. 6 - 10. 7’ – High profile 11. 9 - 14. 0’ – Ultra high profile 15’ +

Low profile

Super Ultra High