An Assessment of the Greatest Impacts on Distribution Uniformity for Drip and Micro Irrigation

Author

Brooke Ashley Worden, California Polytechnic State University, San Luis ObispoFollow

DOI: https://doi.org/10.15368/theses.2018.119
Available at: https://digitalcommons.calpoly.edu/theses/1942

Date of Award

9-2018

Degree Name

MS in Agriculture - Irrigation

Department/Program

Bioresource and Agricultural Engineering

Advisor

Franklin Gaudi

Abstract

Using the Cal Poly Irrigation Training and Research Centers (ITRC) drip/micro evaluation program, global, or system, DU_lq is computed by combining the component DU_lq values of: pressure variation, uneven spacing between emitters, unequal drainage and “other” causes. “Other” causes include plugging, wear and manufacturing coefficient. The program also computes what percentage of the non-uniformity is due to each component. Burt (2004) showed that over 95% of the non-uniformity is due to “Other” causes and pressure differences. This thesis looks at what specifically in those components is driving the non-uniformity by analyzing various equipment and field practices and their impact on the distribution uniformity. A regression analysis is used to analyze trends in distribution uniformity in an open environment. The results indicate that more information, specifically water quality, is needed to better analyze which components influence the distribution uniformity of a system.