Journal of Irrigation and Drainage Engineering: Recent submissions
Now showing items 2881-2900 of 3826
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Irrigation Methods Used in California: Grower Survey
(American Society of Civil Engineers, 1996)A statewide survey was conducted during 1992 to determine which methods growers used to irrigate their crops in 1991. A questionnaire was distributed to 10,000 of the estimated 80,000 growers in California. Respondents ... -
Soil-Limiting Flow from Subsurface Emitters. I: Pressure Measurements
(American Society of Civil Engineers, 1996)Subsurface drip irrigation has become a common method for the irrigation of field crops, trees, and landscaping. When the predetermined discharge of the emitter is larger than the soil infiltration capacity, water pressure ... -
Hydrologic Impact of Great Flood of 1993 in South-Central Kansas
(American Society of Civil Engineers, 1996)The writers analyze the hydrologic budget and quantify the ground-water recharge impact of the Great Flood of 1993 on the Great Bend Prairie aquifer of south-central Kansas. During the summer of 1993, rainfall totals ... -
Effect of Recharge Duration on Water-Table Response
(American Society of Civil Engineers, 1996)The problem of the effect of recharge duration on water-table response in areas with tile drains is studied using Green's function approach to the linearized Boussinesq's equation for one-dimensional, saturated flow with ... -
Optimal Design of Sloping Weir
(American Society of Civil Engineers, 1996)Weirs are important hydraulic structures constructed across rivers for diverting water for irrigation and power generation. Optimal design of these structures has not been attempted earlier as it involved diverse fields ... -
Time of Concentration and Peak Discharge Formulas for Planes in Series
(American Society of Civil Engineers, 1996)Based on the kinematic-wave equations, a time of concentration formula for overland flow over a series of planes is derived. The formula is applicable to a cascade of planes, to planes of different roughnesses, to planes ... -
Estimation of Annual Storm Runoff Coefficients by Continuous Simulation
(American Society of Civil Engineers, 1996)A continuous simulation technique, based on the Soil Conservation Service (SCS) method, is used to determine annual storm runoff coefficients (ASRCs) for Orlando, Florida using 13 years of daily rainfall data. The ASRC, ... -
Field Evaluation of Water and Solute Distribution from a Point Source
(American Society of Civil Engineers, 1996)Field measurements of water and solute distribution from a point source were made using the gravimetric method. The variables affecting water and solute distribution, including application rate (1.5, 2.0, and 2.5 L/h), ... -
<b>M</b>odeling Seasonal Furrow Irrigation
(American Society of Civil Engineers, 1996)A seasonal furrow irrigation model consisting of submodels to predict irrigation schedule (water balance), irrigation design (surface irrigation hydraulics), and crop yield (yield function) under spatially and temporally ... -
Sprinkler Performance as Function of Nozzle Geometrical Parameters
(American Society of Civil Engineers, 1996)The main design parameter for a square nozzle is its inside contraction angle, and key design parameters for a triangular nozzle include the inside contraction angle and the length-to-width ratio of the triangular orifice. ... -
Nonlinear Root-Water Uptake Model
(American Society of Civil Engineers, 1996)Sound irrigation management requires information about root-water uptake patterns of different crops. In the existing literature, the extraction rate of soil moisture by the roots is assumed to be either constant or varying ... -
Steady-State Effect of Freshwater Injection on Seawater Intrusion
(American Society of Civil Engineers, 1996)Steady-state solutions for the motion of the freshwater-seawater interface due to series of injection wells were obtained using a sharp interface finite element model. The performance of the numerical model was tested with ... -
Complete Hydrodynamic Border-Strip Irrigation Model
(American Society of Civil Engineers, 1996)In this study, a hydrodynamic model is presented for simulating all the phases of border-strip irrigation. The explicit, second-order accurate MacCormack scheme is used for solving the governing equations of surface ... -
CO <sub>2</sub> and Temperature Effects on Evapotranspiration and Irrigated Agriculture
(American Society of Civil Engineers, 1996)A sensitivity analysis of potential evapotranspiration (PET) rates under both CO -
Precipitation and Water-Table Effects on Agricultural Production and Economics
(American Society of Civil Engineers, 1996)The sensitivity of irrigated agriculture to water-table fluctuations and agroeconomic parameters was analyzed in the context of long-term climatic variability. Capillary rise was modeled as a function of soil moisture ... -
Research Agenda on Sustainability of Irrigated Agriculture
(American Society of Civil Engineers, 1996)The materials presented in this paper are the result of a North Atlantic Treaty Organization (NATO) Advanced Research Workshop on “Sustainability of Irrigated Agriculture (Sustainability of Water Resources Utilization in ... -
Performance of Electric Irrigation Pumping Plants Using Variable Frequency Drives
(American Society of Civil Engineers, 1996)The constant revolutions per minute (RPM) of electric motors prevents adjusting the pump performance to match variable operating conditions, and thus the pump output is usually reduced or throttled with a valve in the ... -
Optimal Land Grading Based on Genetic Algorithms
(American Society of Civil Engineers, 1996)Design of a successful and efficient surface irrigation system involves land grading as its first step. Land grading is also an effective method for efficient surface drainage. In this research, a nonlinear optimization ... -
Ordinary Operating Conditions of Large Channels of Moscow's Sewerage Network
(American Society of Civil Engineers, 1996)The subject of investigation in this paper is large channels of an urban sewerage network. The analysis of dynamical properties of a sewer, as a component of the controlled system is performed in terms of automatic control ... -
Assessing Integrity of Weather Data for Reference Evapotranspiration Estimation
(American Society of Civil Engineers, 1996)Procedures and guidelines are recommended for assessing integrity, quality, and reasonableness of measured weather data and equipment calibration for automated and electronic agricultural weather stations. The procedures ...