Study area: Segura River Basin

General Characteristics:

Segura River Basin location
Mean annual rainfall on Segura River basin
Mean annual ETp
Segura River Basin

SURFACE (Km2)

18 815

POPULATION THAT DEMANDS RESOURCES FROM SEGURA RIVER BASIN (inhabitants). Year 2009

 1 969 370

SUMMER POPULATION (inhabitants). Year 2009

> 2 500 000

TOTAL LENGHT OF CHANNEL NETWORK (Km)

1 470

IRRIGATION SURFACE (ha)

269 029

SOURCES OF WATER RESOURCES (Hm3)

 Surfacewater  ;   Groundwater

Reutilization ; Desalinisation; Tajo-Segura Water Transfer

  • The South East of Spain receives less Rainfall than the rest of Iberian Peninsula. SRB: Mean annual Rainfall = 300 mm.
  • SRB: Mean annual Potential Evapotranspiration     ETp = 1500 mm.
  • Most of the area is classified as semi-arid, while the coastal areas are considered ´arid´.
  • Available water resources per inhabitant in the SRB: only 442 m³/inhabitant/year >The SRB  presents the least renewable water resources of all the Spanish river basins.

 

Surface (km2)

Ratio per 

inhabitant

SRB

18 870 (3.7%)

442 m³/inhab/year

Spain

506474

2460m³/inhab/year

  • Agriculture area:  more than 43 % of the basin surface, of which one-third is brought under irrigation (269 000 ha).
  • Irrigated agricultural water demand : 85 % of the total water demand in 2007 in the entire basin.
  • Water scarcity is a major issue in the Segura River Basin.


Simplified water balance for Segura River BasinSegura RiverBasin (SRB): Measures

Several measures were adopted,

  • Water transfers from other basins, two water transfers (from Tagus river, and from Negratín river).
  • Desalinization plants (14 desalinization plants with 146 hm3 capacity for agricultural use and 188 hm3 for urban/industrial use).
  • Reuse of treated waters for agriculture (155 wastewater treatment plants ;  142 hm3for 2010).
  • Improvements in flow regulation (33 dams with more than 10m height).
  • 11 water purification plants (total production 190 hm3  for 2010).
  • Modernization of irrigation systems to improve its efficiency and to reduce its water consumption.
  • Transference of irrigation rights between users.

Main problem: A high number of aquifers are classified as under high pressure and over-exploited.

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La CHS toma muestras en el río Segura en Murcia para investigar la aparición de espuma y peces muertos

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