Source of the Segura River
|Origin||Fuente Segura, Sierra de Segura, Jaén|
|Mouth||Guardamar del Segura, Alicante|
|Source elevation||1,413 m|
|Mouth elevation||0 m|
|Avg. discharge||Cieza: 26.3 m³/s|
|Basin area||19,525 km²|
Segura (Spanish: [seˈɣuɾa], Valencian: [seˈɣuɾa]; Latin: Thader, Arabic: شقورة, War-Alabiat) is a medium-sized river in southeastern Spain. It is named after Sierra de Segura, the range where it has its source.
The river begins at Santiago Pontones (province of Jaén), passes Calasparra, Cieza, Murcia, Beniaján, Orihuela, Rojales and ends in the Mediterranean Sea near Guardamar del Segura in the province of Alicante. Some of its tributaries are the Mundo (which starts near Riópar), the Alhárabe (which starts in Moratalla), the Mula and the Guadalentín.
The alluvial plain is called the Vega del Segura and is a very productive agricultural region growing a wide variety of fruit, vegetables and flowers. The Vegas are divided into three areas: Alta, Media and Baja (upper, medium, and lower).
During the 1990s, the Segura had become one of the most polluted rivers in Europe, due to the urban and agricultural residues originating in the densely populated area in the medium and lower areas of the basin. This combined with a low discharge in the same areas, where the agricultural use of water reduces the mean discharge to around 2 to 3 m³/s in Murcia city, which makes more difficult to dilute pollutants. However, in recent years extensive water management techniques and the implementation of waste water treatment plants have greatly improved the situation. By 2013, otters –an species particularly sensitive to water pollutants– had repopulated large tracts of the river where they had been absent for decades.
|Guardamar del Segura||1 m³/s|
The Segura is usually in a state of semi-permanent drought, however, now and then, it does occasionally flood as the consequence of the torrential rains (cold drop), which typically take place once every 6–9 years approximately, always in Autumn and Spring.
In the twentieth century significant flooding occurred in 1946, 1948, 1973, 1982, 1987 and 1989. Since 1990 the lower reaches of the river have been canalized, removing meanders and hence improving the evacuation of flood waters. The new canal was put to the test in September 1997 and October 2000 when heavy rainfall resulted in significant runoff.
Segura floods in Murcia and Orihuela
|October, 1651||1.700 m³/s|
|October, 1834||1.000 m³/s|
|15 October, 1879 (Santa Teresa flood)||1.890 m³/s||2.000 m³/s|
|April, 1946||1.187 m³/s||1.138 m³/s|
|October, 1948||934 m³/s||1.172 m³/s|
|November, 1987||1.000 m³/s|
- List of rivers of Spain
- Flash flood
- Flood protection
- Irrigation district
- Saltwater intrusion
- La Vicaria Arch Bridge
- Water pollution
- Water stress
|Wikisource has the text of the 1911 Encyclopædia Britannica article Segura.|