OTIMIZAÇÃO DO DIMENSIONAMENTO HIDRÁULICO DE UMA SUBUNIDADE DE IRRIGAÇÃO LOCALIZADA

Abstract

The design of the irrigation system is limited by the uniformity and, consequently, by the head loss and topography of the area. One of the main tasks of the hydraulic design of a microirrigation system is to determine the geometric characteristics of pipe diameter, the pressure in the system and the uniformity in the design phase. In this work, the backstep method was used to determine the flow rate, head loss and pressure in the system. The model was developed to meet conditions without slope, uphill and downhill. The bisection method was applied to optimize hydraulic design for a single lateral line or to a microirrigation subunit. The inner diameter of the lateral line and the manifold was determined to meet a water distribution uniformity above 90%. The pressure was defined at the end of the lateral line and manifold to meet the mean flow rate condition required in the emitters. With the advancement of technology, it is possible to implement computational language complex equations and reach a great hydraulic design. The equations were implemented in R language, in function format, and proved to be a fast and simple tool for the system hydraulic dimensioning of irrigation.