Sobre a implantacao de rampas polares Alguns aspectos em analise e sintese

Among irrigation systems, the center-pivot has had and continues to have an important role on irrigation in Portugal as well as in all the World, due to its automatization possibilities. The purpose of this work is to analyse some of the most important subjects concerning center-pivot systems design on a different way from other studies on center-pivot irrigation systems. The hydraulics of lateral is studied and friction losses on lateral having one pipe size and also on tapered laterals (Multiple-pipe-size). Several factors are analyzed and the conclusions are somewhat different from those of specialized authors. Special attention is made on application and intake rate to predict runoff, based on Kostiakov's, Kincaid's and green-ampt's models. The selection of span lengths is made to compose a lateral on a least expensive way. At the end, a synthesis of all algorithms presented along the text is madeAvailable from Fundacao para a Ciencia e a Tecnologia, Servico de Informacao e Documentacao, Av. D. Carlos I, 126, 1200 Lisboa / FCT - Fundação para o Ciência e a TecnologiaSIGLEPTPortuga