Allocation Of Flow To Plots In Pressurized Irrigation Distribution Networks
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The method of allocating flow to plots proposed by Clément and Galand (1979) has been revised. Mention is made of its drawbacks owing to the lack of consideration of the specific technical-economic factors of current pressurised irrigation systems (drip or sprinkler) in the plot. A method for fixed irrigation systems is proposed which, based on economic considerations, determines an optimum block area. Bearing in mind the method of irrigation in the plot, an allocation of constant flow is proposed up to a value of maximum surface area, and, from there on, a linear increase related to the plot area. A formula is also presented for calculating the maximum number of blocks from variables easily obtainable in the project phase. Keywords: irrigation network, pressurized irrigation, allocation of flow. 1 Introduction In the current context of high competition for water, there is a need for systems to allow an adequate control of this resource combined with easy management. A good solution is the use of pressurised irrigation distribution systems. When engineers face the design of a distribution network, they start with different size plots that have to be supplied. The design problem consists of responding to the question of which flow to supply depending on the area of the plot. Once this question is solved, in the case of networks organised by demand, the probability of opening is calculated, and hence, the maximum flows in the network sections, for a specific frequency can be obtained through Clément’s first formula [1,3]. The following step is the calculation of the diameters of the sections.
irrigation network, pressurized irrigation, allocation of flow.