Overview
URBANIZACION EL ENCINAR is a secondary wastewater treatment plant in Calvarrasa de Arriba, Castilla y León, Spain, serving approximately 6,322 people. It discharges 458.22 cubic meters of treated effluent daily.
URBANIZACION EL ENCINAR is a municipal wastewater treatment plant located in the small town of Calvarrasa de Arriba, in the province of Salamanca, within the autonomous community of Castilla y León, Spain. The plant serves a population of about 6,322 residents, classifying it as a small agglomeration under European Union classification. The plant provides secondary treatment, which is the standard biological treatment required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for inland freshwater discharges from agglomerations of this size. The designed capacity of 6,322 population equivalents matches the population served, indicating the plant is sized appropriately. The daily discharge volume of 458.22 cubic meters reflects the typical flow from this community. The treated effluent is discharged into a local watercourse that ultimately drains into the Tormes River, a tributary of the Duero River, which flows westward through Portugal to the Atlantic Ocean. The plant plays a key role in protecting the Tormes River basin from nutrient pollution and maintaining water quality for downstream ecosystems and human use.
Environmental context
The plant discharges into a small stream that feeds into the Tormes River, a major tributary of the Duero River basin. The Duero River flows through Spain and Portugal, emptying into the Atlantic Ocean near Porto. The watershed supports diverse aquatic life and is used for irrigation and recreation. Secondary treatment helps reduce organic load and suspended solids, protecting the river's ecological health and preventing eutrophication in downstream reservoirs.
Frequently asked questions
The plant is located in Calvarrasa de Arriba, a municipality in the province of Salamanca, in the autonomous community of Castilla y León, Spain.
The plant serves approximately 6,322 people, classifying it as a small agglomeration under EU classification.
The treated effluent is discharged into a local watercourse that flows into the Tormes River, part of the Duero River basin, eventually reaching the Atlantic Ocean.
The plant provides secondary treatment, which is the minimum required by the EU Urban Waste Water Treatment Directive for inland freshwater discharges from agglomerations of this size.
The plant operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), transposed into Spanish law. For small agglomerations like this, secondary treatment is mandatory to protect receiving water bodies.
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