Results 211 to 220 of about 10,742 (254)

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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Closed border irrigation evaluations

Agricultural Water Management, 1984
Abstract One hundred and thirty-four irrigations were evaluated, on 16 on-farm closed borders in southern New Mexico, over a 3-year period. Storage efficiencies, deep percolation efficiencies and loss ratios were the major performance parameters evaluated in the study.
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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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Land Forming for Border Irrigation

Transactions of the ASAE, 1978
ABSTRACT AN earthwork-optimization technique, applicable to land grading for border irrigation, is presented. The method is developed for use with the digital computer using iterative application of least-squares principles to obtain an optimum field surface, based on minimizing the required volume of cut.
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Effectiveness of Border Irrigation: A Case Study

Journal of Agricultural Engineering Research, 1997
A method for the evaluation of adequacy, distribution and application efficiencies of border irrigation is proposed. A mathematical model for the simulation of surface runoff and infiltration is applied in order to analyse the waterings carried out according to traditional practice in the lower Po valley and according to systematic, full and deficit ...
G.L. Galbiati, F. Savi
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Design procedure for border irrigation

Irrigation Science, 1997
An open-end graded border design procedure is presented. The proposed method based on the principle of mass conservation requires Kostiakov and Manning formulations for infiltration and roughness, respectively. The key assumption of the present design procedure is that the minimum infiltrated depth occurs at the lower border end and is equal to the ...
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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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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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Dimensionless Solutions of Border-Irrigation Advance

Journal of the Irrigation and Drainage Division, 1977
The equations of border-irrigation flow are written in dimensionless form and solved numerically at three different levels of mathematical approximation. For the advance phase three independent parameters exist: the Froude number based on normal depth, the dimensionless exponent of the Kostiakov infiltration equation, and a dimensionless parameter ...
Nikolaos D. Katopodes, Theodor Strelkoff
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ANALYSIS AND DESIGN OF BORDER IRRIGATION SYSTEMS

Transactions of the ASAE, 2005
Application efficiency (Ea) is the primary criterion for border irrigation design and management. The objective of this study is to analyze the behavior of the application efficiency function of border irrigation with respect to border length (L) and unit inlet flow rate (qo), given a target minimum application depth.
null D. Zerihun, null C. A. Sanchez, null K. L. Farrell-Poe, null M. Yitayew   +3 more
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