Abstract: Furrow shape information is required for modeling and evaluating furrow irrigation. Currently used shape models assume the furrow perimeter is rigid so that only the flow depth increases with capacity. Actual furrow ...

Abstract: The hydraulic roughness of irrigation furrows is generally assumed to be uniform throughout a field. However, water flow, which varies along furrows, reduces roughness by breaking down soil aggregates and depositing sediments ...

Abstract: Flow measurement devices can cause significant errors in inflowoutflow channel water loss measurements. The device effects, caused by the increased water surface elevation upstream of a device, must be subtracted from ...

Abstract: Soil erosion is sometimes excessive during furrow irrigation and under center pivot sprinkler systems. An understanding of erosion processes is required to predict and develop management practices to reduce irrigation ...

Abstract: The primary source of error in properly calibrated, constructed, and installed flow measurement devices is due to reading error or uncertainty. Head reading uncertainty in small V‐notch flumes and submerged orifices is ...

Abstract: Furrow infiltration and channel seepage are often measured with inflow‐outflow measurements. Inaccuracy in the flow measurement will cause a larger uncertainty in the calculated infiltration. The infiltration rate determination ...

Abstract: Crop evapotranspiration under deficit soil water conditions must be quantified to accurately manage deficit irrigation and crop water stress and achieve targeted water savings. A stress coefficient is commonly used to ...

Abstract: Low-cost electronic digital ``stick-on'' clocks were modified and used with a water sensor to determine irrigation rate-of-advance. The clock-sensors, spaced intermittently in a test furrow or in a border or basin, were ...

Abstract: Of the 15,000,000 ha (37,000,000 acres) of irrigated land in the U.S., 21% is affected by soil erosion to some extent. Irrigation‐induced soil erosion has been studied, primarily in the Northwestern United States, since ...

Abstract: The common belief is that there are opportunities in the agricultural sector to use less irrigation water and thus make saved water available for municipal and industrial uses. The key is for farmers to maximize farm profit ...