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Rapid Field Evaluation Of Drip And Microspray Distribution Uniformity, Charles M. Burt
Rapid Field Evaluation Of Drip And Microspray Distribution Uniformity, Charles M. Burt
BioResource and Agricultural Engineering
The Cal Poly ITRC irrigation evaluation programs have been widely used to assess the global distribution uniformity (DU) of drip and microsprayer irrigation systems. The field procedures and formulas used in the program are presented in this paper. The system DU is estimated by mathematically combining the component DU values. DU components include pressure differences, "other causes" (such as manufacturing variation, plugging, and wear), unequal drainage, and unequal application rates. Results are presented from evaluations by several entities, including Cal Poly ITRC. Cal Poly evaluations of 329 fields provided an average DUlq of 0.85 for drip and 0.80 for …
Irrigation District Observations On Large Diameter, Low Pressure Pipeline Materials, Charles M. Burt
Irrigation District Observations On Large Diameter, Low Pressure Pipeline Materials, Charles M. Burt
BioResource and Agricultural Engineering
There are approximately 1,400 miles of low pressure non-reinforced cast-in-place ("monolithic" or "CIP") concrete pipe in California irrigation districts. Cast-in-place pipe was irrigation districts’ material of choice for large diameter pipelines from 1930 to at least 1980. Many of these pipelines were installed in the early 1900’s. They are predominately found on the east side of the San Joaquin Valley, from Manteca in the north to Visalia in the south. Most of these pipes are deteriorating and will need to be replaced within the next 10-20 years.
Irrigation districts have attempted to find new ways to repair these pipes. However, …
Water Level Sensor Testing Summary, Stuart Styles, Sarah Herman, Marcus Yasutake, Chuck Keezer
Water Level Sensor Testing Summary, Stuart Styles, Sarah Herman, Marcus Yasutake, Chuck Keezer
BioResource and Agricultural Engineering
The findings presented here are the continuation of a series of studies begun in 1998 by the Irrigation Training and Research Center (ITRC) at California Polytechnic State University (Cal Poly), San Luis Obispo, California, on behalf of the Mid-Pacific Region of the United States Bureau of Reclamation (USBR) to test water level sensors under a variety of hydraulic conditions.
The goals for the original project were to determine the best way to monitor water level, and to develop a fast method for appraising sensors considered for irrigation district applications. This research addresses the need for water level sensors that are …
Benchmarking Of Flexibility And Needs - 2004, Charles Burt, Dan Howes, Franklin Gaudi, Monica Holman
Benchmarking Of Flexibility And Needs - 2004, Charles Burt, Dan Howes, Franklin Gaudi, Monica Holman
BioResource and Agricultural Engineering
ITRC interviewed irrigation district personnel from 25 agricultural districts in eastern Washington, northern Idaho and western Montana.
Data were analyzed to determine the degree of water delivery flexibility provided to farmers and the extent of existing and planned district modernization. This is the fourth such report the Irrigation Training and Research Center (ITRC) has published for irrigation districts in the western US. The first two evaluations were conducted on behalf of the Mid-Pacific Region of the US Bureau of Reclamation (USBR) and included California irrigation districts that had long-term federal contracts. The third report was prepared on behalf of the …