Results 221 to 230 of about 10,742 (254)

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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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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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 ...
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ANALYSIS AND DESIGN OF BORDER IRRIGATION SYSTEM

2002 Chicago, IL July 28-31, 2002, 2002
In border irrigation, both time-based and distance-based cutoff criterion are used to time inflow cutoff. Each criterion has its own advantage and limitation. In this study, the advantages and limitations of each cutoff criterion are discussed. Using application efficiency as the primary design and management criterion, alternative optimality ...
null D. Zerihun, null C.A. Sanchez, null and K.L. Farrell-Poe   +2 more
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Hydrograph Shape and Border Irrigation Efficiency

Journal of Irrigation and Drainage Engineering, 1995
Sloping borders with free outflow were studied to determine the effect of inflow hydrograph shape on maximum application efficiency. A zero-inertia model describing the movement of water along the border run with infiltration was used to predict the maximum application efficiency for five inflow hydrograph shapes.
A. A. Alazba, D. D. Fangmeier
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Determining infiltration rates in an irrigation border

Journal of Geophysical Research, 1960
The relationship between the flow of water in an irrigation border and the infiltration rate of the soil as a function of time has been treated by previous authors, primarily by an analytical approach. A simple graphical construction is proposed whereby the time-infiltration curve can be constructed from data gathered in an irrigation border test under
Herman J. Finkel, Dov Nir
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Evaluation of infiltration measurements for border irrigation

Agricultural Water Management, 1981
Abstract A number of methods are discussed for obtaining a reasonable estimate of the infiltration function for irrigation borders. Data from ring infiltrometers are fit to power functions for infiltration rate and cumulative infiltration rate versus time and to a branch function where the infiltration rate is not allowed to go below some value ...
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A mathematical model for border strip irrigation

Water Resources Research, 1983
A kinematic model is developed to discuss surface irrigation when the infiltration function consists of a long‐time gravity term plus a short‐time capilliary or sorbtivity term. The corresponding model equations are solved either exactly or numerically, and several graphical solutions are presented.
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Algebraic Computation of Flow in Border Irrigation

Journal of the Irrigation and Drainage Division, 1977
Approximate advance and recession curves are obtained for a surface irrigation defined by the border characteristics — length, width, slope, Manning roughness, and infiltration parameters — and by the operation characteristics, inflowing discharge, and cut-off time. Thus, all the data necessary to compute the distribution of infiltrated water and water-
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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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