Poço de infiltração para controle de enchentes na fonte: avaliação das condições de operação e manutenção

This study investigated the following aspects regarding a soakaway, i.e. an infiltration well: i) entrance filter device; ii) permeability of the geotextile; and iii) emptying time. The 3.6 m³ infiltration well drains a roof area of 241.8 m². The entrance device is made up of layers of sand, gravel and geotextile set on a metal structure. The concrete rings that form the lateral walls were covered with geotextile, and bricks were laid between the soil and concrete rings. The infiltration well remained in operation during the entire testing period, and specific events were simulated to measure the emptying time. Permeability and fine particle tests were carried out after eight months of operation. Samples of geotextile taken from the bottom, the walls and the entrance device presented average permeability reductions of approximately 50.7%, 7.7% and 21.2%, respectively. The sand in the entrance device retained around 34.8% of fine particles and the gravel retained 0.13% in the same period. The infiltration rate was approximately 34.7 mm/h. The R2 coefficient for measured and calculated times was 0.97.

Avaliação da construção e operação de técnicas compensatórias de drenagem urbana: o transporte de finos, a capacidade de infiltração, a taxa de infiltração real do solo e a permeabilidade da manta geotêxtil

This work aimed to evaluate some aspects of construction and operation of full-scale best management practices and their effects on infiltration loading rate. Two systems were studied: i) filter-swale-trench (FST) and ii) infiltration well (IW). In these units, field essays and full-scale measurements were made in order to assess the soil permeability. Further, the fine particles transportation and the geotextile blanket permeability were determined before and after operation. The results pointed out that there were soil transportation to inside the FST and IW systems, despite of the installed protections, and that these material were responsible for diminishing the geotextile (reduction from 30 to 90% for FST and 40 to 70% for IW) and the full-scale infiltration loading rates (varying from 4,7 x 10-6 to 10-5 m.s-1).

The definition of potential infiltration areas in Guaratingueta watershed, Paraiba do Sul Basin, Southeastern Brazil: an integrated approach using physical and land-use elements

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Short-term evaluation of non-absorbable microgranular hydroxyapatite infiltration in the guinea pig subepidermal abdominal region

Non-absorbable microgranular hydroxyapatite was infiltrated into the subepidermal abdominal region of guinea pigs in order to assess the possibility of using this material to correct deficiencies in orbital volume. Microgranular hydroxyapatite (2.0 ml) was subepidermally infiltrated into the abdominal region of 20 guinea pigs. The animals were divided into four experimental groups of 5 animals each, which were killed 7 (G1), 15 (G2), 30 (G3) and 60 (G4) days after infiltration. The area and the largest and smallest diameters of the nodules formed by infiltration were evaluated at the site of infiltration and histological examination was performed. The mean granuloma area was similar in all groups. Histopathological examination showed that the material remained isolated from surrounding tissues by a pseudocapsule that became denser throughout the experiment. A host reaction started with young fibroblastic tissue that evolved to dense tissue until cartilaginous tissue was formed in G4, progressively advancing towards the center of the granuloma from G1 to G4. Non-absorbable microgranular hydroxyapatite is an inert material that was well tolerated by the animals studied, with maintenance of the infiltrated volume, and may perhaps be useful to fill anophthalmic cavities.