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Design and management guidelines for contour basin irrigation layouts in southeast Australia

Published on Aug 1, 2003in Agricultural Water Management3.542
· DOI :10.1016/S0378-3774(03)00076-3
Manoj Khanna8
Estimated H-index: 8
(IARI: Indian Agricultural Research Institute),
Hector Malano21
Estimated H-index: 21
(University of Melbourne)
+ 1 AuthorsHugh Turral28
Estimated H-index: 28
(IWMI: International Water Management Institute)
Abstract
Contour basin irrigation layouts are used in Australia for sequential cultivation of rice and other crops on soils with low infiltration rates. Multiple interconnected basins through gates installed in the check banks and backflow at the inlet end are unique features of contour basin layouts used in southeast Australia. Design and management guidelines were developed using a two-dimensional computer simulation model (COBASIM) for contour basin layouts. The computer model was used to simulate and analyse the performance of single- and multiple-basin layouts in response to key design variables including aspect ratio, inflow rates, microtopography, vertical interval between basins and number of interconnecting drainage outlets. The main aim of this study was to provide designers and practitioners with an overall view of the likely impact trends arising from variations in key design factors and to improve design practices. Irrigation performance was measured by the time of advance needed to cover the entire basin area, application efficiency, water requirement efficiency and distribution uniformity. The study revealed that the aspect ratio and local microtopography have a significant impact on the performance in these layouts. A mild slope in the advance direction can improve performance when a small depth of irrigation is required, while there are no significant benefits from increasing the elevation difference between adjacent basins.
  • References (12)
  • Citations (8)
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References12
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#1Manoj Khanna (IARI: Indian Agricultural Research Institute)H-Index: 8
#2Hector Malano (University of Melbourne)H-Index: 21
Last. Hugh Turral (IWMI: International Water Management Institute)H-Index: 28
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The development of a two-dimensional simulation model for single regular shape (rectangular) contour basin irrigation layout in southeast Australia is reported in a companion paper. Contour basin layouts as used in Southeast Australia are often irregular in shape and laid out as multiple basin systems. Irrigation of these basins is carried out sequentially involving back flow to the supply channel and inter-basin flow. This paper presents the extension of the earlier model to incorporate irregul...
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#1Manoj Khanna (IARI: Indian Agricultural Research Institute)H-Index: 8
#2Hector Malano (University of Melbourne)H-Index: 21
Last. Hugh Turral (IWMI: International Water Management Institute)H-Index: 28
view all 4 authors...
Contour basin irrigation layouts are used to irrigate rice and other cereal crops on heavy cracking soils in Southeast Australia. In this study, a physically based two-dimensional simulation model that incorporates all the features of contour basin irrigation systems is developed. The model’s governing equations are based on a zero-inertia approximation to the two-dimensional shallow water equations of motion. The equations of motion are transformed into a single nonlinear advection–diffusion eq...
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In this study, a hydrodynamic model is presented for simulating basin irrigation. An explicit, second-order-accurate finite-volume technique is used for solving the two-dimensional governing equations of basin irrigation. The empirical Kostiakov-Lewis infiltration equation is used for the calculation of infiltration. The model is validated using field data and numerical results available in the literature. The proposed model was used for simulating a basin irrigation event in an irregular field ...
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