The water reclamation and reuse project of El Prat de Llobregat, Barcelona, Spain.

Water reclamation and reuse have become essential components of water resources management in the Metropolitan Area of Barcelona, by helping to develop additional water resources in the lower Llobregat River, one of its main sources of water supply. By generating a reliable flow of 300,000 m3/day of high quality reclaimed water, the options available for integrated water resources management have widely expanded to allow in-stream river water substitution, restoration of natural wetland areas, agricultural irrigation, and supply to a seawater intrusion barrier. Those management options have been possible thanks to the implementation of an extensive water distribution system that allows distribution of reclaimed water to a point 15 km upstream of the reclamation facility, and to a seawater intrusion barrier within a few kilometres of the plant.

Soft contact lens visual performance: a multicenter study.

The present investigation concerns the evaluation of the visual performance of two groups of subjects, each by a different investigator, while wearing two contact lens corrections (Acuvue and SeeQuence) and spectacles. The investigation involved the measurements of visual acuity with Logmar progression charts (Regan contrast sensitivity letter charts) of two different contrasts (92% and 6%) at two luminance levels (250 and 2.5 cd/m2) and the evaluation by questionnaire of the subjects' visual acceptance.