Your search found 2 records
1 Peri, G.; Skogerboe, G. V.; Norum, D. I.. 1979. Evaluation and improvement of basin irrigation. Fort Collins, CO, USA: Colorado State University. xix, 179p. (Water management technical report no.49B)
(Location: IWMI-HQ Call no: 631.7.8 G000 PER Record No: H0327)
A comprehensive definition and description of basin irrigation is given. A procedure is outlined for the design and evaluation of basin irrigation systems, showing the interactions between the various basin characteristics, the operational parameters, the management parameters, and the performance parameters. A general model is discussed by considering the various functions upon which it must be based (infiltration, advance, recession). A simple model for the determination of the infiltrated water distribution under basin irrigation is also presented. It is shown that the actual distribution can be determined from limited field data. The model can be applied to both level and sloped basins. Comparison with other more complicated models shows satisfactory agreement in the distribution. A complete infiltrated water distribution under basin irrigation can be approximated from limited field observations. Field procedures are described that will provide the parameters required to determine the distributions. As only two of a possible four parameters are sufficient to define each distribution, the selection of these parameters should be made on the basis of circumstances under which the field observations were made. General guidelines are given for the selection of the most reliable parameters. The main advantage of the method is its simplicity in both the field measurements required and in the data analysis. The procedure suggested is suitable for most practical cases, especially as a preliminary evaluation when detailed studies are not warranted.
2 Peri, G.; Norum, D. I.; Skogerboe, G. V. 1979. Evaluation and improvement of border irrigation. Fort Collins, CO, USA: Colorado State University. xv, 105p. (Water management technical report no.49C)
(Location: IWMI-HQ Call no: 631.7.8 G730 PER Record No: H0326)
The evaluation of border irrigation requires the use of a model that relates the operating conditions to the irrigation results, such as: (a) total water quantity delivered to the border; (b) water losses outside the border by runoff; (c) average depth of application; and (d) water distribution within the border. Evaluation for improving border irrigation can be carried out in two major ways: (a) field tests; and (b) theoretical models. The improvement of border irrigation based on field tests requires the estimation of the infiltration equation and the advance and recession for a specific inlet stream and border parameters (slope, length, surface). The performance parameters can then be calculated to determine the irrigation performance and the need for improvements. Then, the operating conditions that are to be changed can be determined. This analysis comprises two stages: (a) utilization of the field test data already available; and (b) implementation of the recommended changes for further field tests. Theoretical models for the evaluation and improvement of border irrigation performance enable one to predict the water distribution and losses for a given set of conditions, without direct field measurements. Only limited amounts of preliminary field work are required to predict the irrigation performance for a wide range of parameters and variables. Available models are described, as well as the process for applying these models.
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