Controle de erosão em estradas rurais não pavimentadas, utilizando sistema de terraceamento com gradiente associado a bacias de captação

The agricultural unpaved roads are important road structures for the economic and social agricultural development of the Nation, and the erosion provoked by rain water in the road bed and sides are closely related to bad draining, one of the main factors for their degradation. In order to make the draining system adequate, it is necessary to know about erodibility, infiltration capacity of water in the ground and adoption of mechanical slope abatement with grid elevation and water interception. This study presents drainage model through the construction of terraces with gradient transversally associated to the capitation basin in abruptic red dystrophic argisol soils, medium sandy texture, based on slops abatement techniques, elevating the road bed and deviating flow. The grain sized fractions of this ground (sand, silt, clay) and the aggregate stability indicated that this ground, under anthropic action, presents erosive processes resulting in superficial draining with ground hauling, sanding sources and courses of water situation below roads, providing great environmental impacts in the hydric bodies. The reduction of erosion problems in these unpaved roads is in the adoption of measures that intercept waters from the draining of their stream bed itself, as well as pluvial waters comings from adjacent areas of contribution, that are collected and conducted to inlaid terraces and capitation basis.

Perfil longitudinal e a aplicação do índice de gradiente (RDE) no rio dos Patos, bacia hidrográfica do rio Ivaí, PR

This paper presents the results of the longitudinal profile analysis and the application of gradient index (RDE) in the Patos River, a tributary of the Ivaí River basin, PR. The goal is identify and quantify the anomalous zones along river course concerning their genesis - activity neotectonic or/and lithological imposition. The Patos River has a length of 127 km and a relief amplitude of 660 m, The occurrence of an important knickpoint in the middle course the Patos River can be divided into two stretches. Of the 22 sections measured, 10 were considered anomalous, distributed in both upper and lower course. In the upper course, over a basaltic bedrock of the Serra Geral Formation the RDE values are lower than those in the lower course, where river flows over sedimentary rocks of the Terezina Formation. The 2 nd order anomalies are related to lithological changes, relief alignments and channel confluences - as in the case of São João River. The 1st order anomalies are linked to differences in rock resistance associated with structural control, which provides the formation of waterfalls.

Informe del Seminario sobre Metodos de Evaluacion de Programas de Planificacion Familiar

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Algunos metodos para el estudio de las distribuciones geograficas de la migracion interna

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Evaluacion estadistica de metodos anticonceptivos: efectividad de uso y efectividad extendida de uso

Apéndice en inglés contiene instrucciones para el registro de estudios de efectividad de uso de anticonceptivos. Documento disponible en inglés (100.01)

A proposito de las preguntas que miden conocimiento de metodos anticonceptivos; un enfoque metodologico

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Educacion, contacto con medios de difusion masiva, comunicacion entre los esposos y uso de metodos anticonceptivos en las zonas rurales de America Latina

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Algunos problemas para determinar metodos apropiados para evaluar el efecto de los programas de planificacion de la familia sobre la fecundidad

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America Latina: metodos de construccion de poblaciones estables y cuasi-estables y algunas aplicaciones para estimar niveles de fecundidad y mortalidad, 1960

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Metodos demograficos para el estudio de la mortalidad

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Seminario sobre metodos para medir variables demograficas: fecundidad y mortalidad

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Naturaleza, metodos y relaciones de la demografia; guia para diez lecciones en el Curso Basico de Demografia, version revisada

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