Results 161 to 170 of about 110,951 (186)

Dimensionless Runoff Curves for Irrigation Borders

Journal of Irrigation and Drainage Engineering, 1984
Non-dimensional runoff curves useful in the design of reuse systems are presented for free outflow irrigation borders. Pertinent open channel variables affecting runoff in border irrigation, including inflow rate, surface resistance, border slope, soil infiltration characteristics, application time, and length of border, were studied and their effects ...
Muluneh Yitayew, Delmar D. Fangmeier
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Mathematical Models and Border Irrigation Design

Transactions of the ASAE, 1979
ABSTRACT A mathematical model of flow in irrigation borders assuming zero inertia is used to evaluate U.S. Soil Conservation Service design criteria for sloping borders with runoff and to demonstrate model capabilities. Model results indicate the SCS design criteria are rea-sonable.
null D. D. Fangmeier, null T. Strelkoff
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Hydrodynamics of Border Irrigation — Complete Model

Journal of the Irrigation and Drainage Division, 1977
The equations of border irrigation are solved by the method of characteristics using a prescribed time increment. At each time step the flow conditions are computed at irregularly spaced nodes on a grid moving with time. Characteristic curves are drawn backwards from each node until they intersect the previous time line.
Nikolaos D. Katopodes, Theodor Strelkoff
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Simulating Overland Flow in Border Irrigation

Transactions of the ASAE, 1976
ABSTRACT AMATHEMATICAL model of the border irrigation process is introduced. It is based on the com-plete equations of continuity and momentum for unsteady, spatially varied flow in open channels. The equations are solved approximately by the method of characteristics. Simulated irrigations are compared to test data.
null D. L. Bassett, null D. W. Fitzsimmons   +1 more
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Hydraulic resistance relationships in irrigation borders

Journal of Agricultural Engineering Research, 1971
Resistance to flow in borders may be due to the roughness of the ground surface or the retardance offered by vegetation. The flow conditions in irrigation borders differ from those in open channels in several ways. A review of the past work has revealed that the Manning n , calculated for uniform flow at a given depth and velocity, applies for all ...
A.M. Michael, A.C. Pandya
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Optimal Design of Border Irrigation Systems

Journal of the Irrigation and Drainage Division, 1981
Using a surface irrigation hydraulics simulation model, relationships were developed between water requirement efficiency and the system design variables. A crop production function was utilized to relate crop yield to the water requirement efficiency.
J. Mohan Reddy, Wayne Clyma
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Inflow rate and border irrigation performance

Agricultural Water Management, 2015
Abstract Modernisation of regional water delivery infrastructure can provide irrigators using border irrigation systems with the option to apply water to border irrigation bays at much higher inflow rates. Substantial improvements in irrigation performance have been claimed by proponents of higher bay inflow rates, leading to large investments in ...
Michael R. Morris, Amjed Hussain, Malcolm H. Gillies, Nicholas J. O’Halloran   +3 more
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Border Irrigation Field Experiment. I: Water Balance

Journal of Irrigation and Drainage Engineering, 2000
This paper presents the results from a detailed field experiment of water movement on a border-irrigated bay in northern Victoria, Australia, an area characterized by shallow ground-water tables and salinization problems. The objective of the study was to quantify the impact of changes in irrigation management on salt and water movement within and from
Mathew Gilfedder, Luke D. Connell, Russell G. Mein   +2 more
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Time-area relationship in border irrigation

Journal of Agricultural Engineering Research, 1965
Abstract By considering infiltration as a time dependent function, an equation is developed and its validity tested by comparison of estimated with observed values.
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Evaluating infiltration for border irrigation models

Agricultural Water Management, 1982
Abstract The infiltration characteristics of a soil are important to the design, evaluation and management of border irrigation systems. The use and verification of border irrigation models also rely heavily on infiltration. This paper presents a technique for determining infiltration when detailed information is available on the total infiltrated ...
openaire   +1 more source