Dissertation/Thesis Abstract

Design and testing of a subsurface excess irrigation capture and re-use system
by Harrel, Kathryn, M.S., California State University, Long Beach, 2015, 209; 1595232
Abstract (Summary)

In January 2014, the California Governor declared a drought state of emergency and directed officials to take action to prepare for future water shortages. Many urban communities in California have shown great efforts in reducing water consumption and conserving water. Meanwhile, various residential communities take pride in the natural and green environment provided to their residents and without water for irrigation, fear a decrease in aesthetic appeal. In an effort to conserve water without giving up irrigation, this thesis takes a closer look at a subsurface irrigation and collection system that could reduce the use of potable water for irrigation in the range of fifteen to thirty percent.

Initial concepts were developed and tested through various potential design models. An extensive literature review was performed. The design criteria and methodology for an infiltration trench was used along with the results from the potential design models as the basis for the subsurface irrigation collection system design. The goal was to create a system beneath the lawn vegetation that would contribute to water conservation through reuse.

A laboratory prototype was constructed and tested in a laboratory. The findings were translated into a design for the American Gold Star Manor (Manor) which was constructed and tested. The complete system at the Manor has an average capture efficiency of 9 percent.

An analysis was performed for which the cost and benefit was assessed for the system at the Manor assuming different capture efficiencies were achieved and the system was implemented over a larger area. This analysis was performed assuming different volumes of water are used to irrigate, one based on the Environmental Protection Agency (EPA) water budget tool and the other using historical data from the Manor. The analysis demonstrated that with 20 percent capture efficiency, a system implemented over a one acre area would pay itself off in 1,444 years under the EPA irrigation assumption and 347 years under the historical use assumption.

To evaluate potential modifications to the system constructed at the Manor, Hydrus 2D/3D, a software package for simulating water movement in variably saturated media, was used to assess various alternatives. Varying media ratios, depths, and irrigation frequencies were modeled and relationships were developed.

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Indexing (document details)
Advisor: Sciortino, Antonella
Commitee: Sciortino, Antonella, Sultana, Rebeka, Willardson, Ben
School: California State University, Long Beach
Department: Civil Engineering
School Location: United States -- California
Source: MAI 54/06M(E), Masters Abstracts International
Subjects: Civil engineering
Keywords: Design, Irrigation, Re-use, Subsurfaces, Trenches
Publication Number: 1595232
ISBN: 978-1-321-93612-4
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