Segura

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This article is about the Spanish river. For other uses, see Segura (disambiguation).

Segura
Source of the Segura River
Origin	Fuente Segura, Jaén
Mouth	Guardamar del Segura, Alicante
Basin countries	Spain
Length	325 km
Source elevation	1,413 m
Mouth elevation	0 m
Avg. discharge	Cieza: 26.3 m³/s
Basin area	19,525 km²

Traject of the Segura River through Spain

The Vega Alta del Segura near Calasparra, Murcia

The Segura River, at its passage by Murcia city

The Vega Baja del Segura in Orihuela, Alicante

Segura (Latin Thader, Arabic War-Alabiat, Spanish and Catalan Segura) is a medium-sized river in southeastern Spain.

It starts at Santiago Pontones (province of Jaén), passes Calasparra, Cieza, Murcia, 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 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 which typically take place once every 6-9 years approximately, always in Autumn.

**Avg. discharge**
Place	Discharge
Cenajo	17,1 m³/s
Cieza	26,3 m³/s
Orihuela	5 m³/s
Guardamar del Segura	1 m³/s

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 of 1997 and October of 2000 when heavy rainfall resulted in significant runoff.

**Segura floods in Murcia and Orihuela**
Date	Murcia	Orihuela
october, 1651	1.700 m³/s
october, 1834	1.000 m³/s
october, 1879	1.890 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

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).

The Segura was one of the most polluted rivers in Europe. However, in recent years extensive water management techniques and the implementation of waste water treatment plants have greatly improved the situation. What must be considered is that the mean discharge is around 2 to 3 m³/s in Murcia city making it very difficult to dilute illegal pollutants.