Journal of Irrigation and Drainage Engineering: Recent submissions
Now showing items 2501-2520 of 3826
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Quasi-Theoretical End-Depth-Discharge Relationship for Rectangular Channels
(American Society of Civil Engineers, 2003)End depth of a free overfall is used as a flow-measuring device in open channels. A quasi-theoretical method for predicting end-depth-ratio (EDR), i.e., ratio of the end depth to the critical depth, and end-depth-discharge ... -
Review of <i>Water for Agriculture: Irrigation Economics in International Perspective</i> by Stephen Merrett
(American Society of Civil Engineers, 2003) -
True Form of Instantaneous Unit Hydrograph of Linear Reservoirs
(American Society of Civil Engineers, 2003)This paper shows that the initial value of any instantaneous unit hydrograph (IUH) should be a positive value, however small. This unique characteristic is clearly demonstrated by the IUH of overland flow derived for a ... -
Water Stress Detection Under High Frequency Sprinkler Irrigation with Water Deficit Index
(American Society of Civil Engineers, 2003)A remote sensing package called the agricultural irrigation imaging system (AgIIS) aboard a linear move irrigation system was developed to simultaneously monitor water status, nitrogen status, and canopy density at one-meter ... -
Discussion of “Deflecting Velocity Rod for Flow Measurements in Small Channels” by Ata-ur-Rehman Tariq and Muhammad Masood
(American Society of Civil Engineers, 2003) -
Closure to “EDR in Circular Channels” by Subhasish Dey
(American Society of Civil Engineers, 2002) -
Estimating Soil Moisture Under Low Frequency Surface Irrigation Using Crop Water Stress Index
(American Society of Civil Engineers, 2003)The present study investigated the relationship between the crop water stress index (CWSI) and soil moisture for surface irrigated cotton ( -
Hydraulically Efficient Power-Law Channels
(American Society of Civil Engineers, 2003)A power-law channel is a generalized form of a channel and includes parabolic and triangular cross sections. For an exponent -
Comparative Study of Two Nitrogen Models
(American Society of Civil Engineers, 2003)The fate of nitrogen in the soil is of major concern because of the potential hazard for nitrogen, applied in excess of the natural decomposing capacity of the soil, to contaminate shallow and deep aquifers. For the ... -
History and Evaluation of Hargreaves Evapotranspiration Equation
(American Society of Civil Engineers, 2003)A brief history of development of the 1985 Hargreaves equation and its comparison to evapotranspiration (ET) predicted by the Food and Agricultural Organization of the United Nations (FAO) Penman-Monteith method are described ... -
Closure to “Deflecting Velocity Rod for Flow Measurements in Small Channels” by Ata-ur-Rehman Tariq and Muhammad Massod
(American Society of Civil Engineers, 2003) -
Optimal Water Management for Reservoir Based Irrigation Projects Using Geographic Information System
(American Society of Civil Engineers, 2003)The shortage of reservoir water is the main constraint in establishing stable water management programs in the Muda Irrigation Project, Malaysia. In this study, a water balance equation was derived to evaluate the performance ... -
Discussion of “Design of Minimum Seepage-Loss Nonpolygonal Canal Sections” by Prabhata K. Swamee and Deepak Kashyap
(American Society of Civil Engineers, 2003) -
Inlet Pressure, Energy Cost, and Economic Design of Tapered Irrigation Submains
(American Society of Civil Engineers, 2003)A new particularly simple equation is derived to solve explicitly the economic design problem of submain lines (microirrigation manifold and sprinkle irrigation submains) with pumping. The appropriate lengths of the submain ... -
Closure to “Design of Minimum Seepage-Loss Nonpolygonal Canal Sections” by Prabhata K. Swamee and Deepak Kashyap
(American Society of Civil Engineers, 2003) -
Energy Dissipation and Air Entrainment in Stepped Storm Waterway: Experimental Study
(American Society of Civil Engineers, 2002)For the last three decades, research focused on steep stepped chutes. Few studies considered flat-slope stepped geometries such as stepped storm waterways or culverts. In this study, experiments were conducted in a large, ... -
Performance of Historic Downstream Canal Control Algorithms on ASCE Test Canal 1
(American Society of Civil Engineers, 2002)Researchers have developed several algorithms to automatically control water levels in irrigation canals. Proportional-integral (PI) control logic has been used for downstream water-level control, but its performance has ... -
Discussion of “EDR in Circular Channels” by Subhasish Dey
(American Society of Civil Engineers, 2002) -
Maintaining Equity in Surface Irrigation Network Affected by Silt Deposition
(American Society of Civil Engineers, 2002)Planning maintenance activities in surface irrigation systems is essential for optimal use of the annual credits. In many countries, the equity of the water distribution is largely affected by sediment deposition but budgets ... -
Determining Minor Head Losses in Drip Irrigation Laterals. I: Methodology
(American Society of Civil Engineers, 2002)Minor head losses at emitter insertions along drip laterals were predicted by a derivation of Bélanger’s theorem and analyzed by the classic formula that includes a friction coefficient