13-14 October 2011, Venice
WFD, Common Implementation Strategy - Water Scarcity and Droughts Expert Group
SEGURA PRB
Storage Capacity Indicator (SCI)
Adolfo Mérida Abril
Jorge Ureta
Javier Gras Treviño
13-14 October 2011, Venice
WFD, Common Implementation Strategy - Water Scarcity and Droughts Expert Group
Storage Capacity Indicator (SCI)Relevance of this indicator:
• In the European Mediterranean basins, reservoirs are necessary in order to supply the water demands required for
drinking water, environment and economic activities.
• This is due to the extreme irregularity of precipitation, both spatially and temporally, which is increasing because of the climate change.
• In Spain there are 1.226 reservoirs with a total storage capacity of 54.364 hm3 whereas total water demands are
51.300 hm3. This storage capacity contributes to mitigate drought impacts.
• The Storage Capacity Indicator (SCI) is one of the most important in the media (TV, radio, newspapers, etc), since it
offers quite understandable information to the public, politicians and general users.
TVE: “show the current storage and the average storage in this month for each basin”
Distribution of main reservoirs in the peninsular Spain
13-14 October 2011, Venice
WFD, Common Implementation Strategy - Water Scarcity and Droughts Expert Group
A few examples on how storage capacity is seen in Spanish media:
ABC: “Water reserves in the region
have decreased to 44%” 5/29/2002
El Mundo.es: “Water reserves decreases for a second consecutive week” 5/17/2006
El País.com: “Water reservoir continues to fall and almost reaches half of its capacity” 7/11/2006
National water reservesTotal capacity: 54,364 hm3
13-14 October 2011, Venice
WFD, Common Implementation Strategy - Water Scarcity and Droughts Expert Group
Calculating the indicator:
• The Storage Capacity Indicator is computed as the relation between:
Current Basin Stocks /Total Basin Surface Storage Capacity
• Spatial scale: River basin (RB) or WFD River Basin District (RBD)
• Temporal scale: Monthly.
• In Facsheet is included a detailed methodology of calculation
Water Storage in Segura Basin's Reservoirs
0
50
100
150
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250
300
350
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450
500
Alfonso X
III
Alg
eciras
* A
nchuricas
Arg
os
Cam
arilla
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Cenajo
Cie
rva,
La
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ente
Fuensanta
La P
edre
ra
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Santo
mera
Taib
illa
Tala
ve
Vald
ein
fiern
o
hm 3Total Capacity
Current Capacity
Source: MARM, oct 2001
13-14 October 2011, Venice
WFD, Common Implementation Strategy - Water Scarcity and Droughts Expert Group
Conclusions:
• SCI identifies the same drought periods as the Segura Basin State Index (Ie basin).
Storage Capacity Indicator (SCI)
Reservoir Storage Indicator
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classes
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Indexes
Percentiles
Storage Capacity Indicator (SCI)
Ie basin
13-14 October 2011, Venice
WFD, Common Implementation Strategy - Water Scarcity and Droughts Expert Group
• The current monthly or annual values can be
compared with the average data indicating possible water scarcity conditions.
• As an example, on the graph it can be seen that 2009/10 started as a normal year, from the storage point of view, and changed to wet and
very wet the rest of the year. While 2005/06 was dry the whole year.
Storage Capacity Indicator (SCI)
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Oct Nov Dic Ene Feb Mar Abr May Jun Jul Ago Sep
2009/2010 2005/2006Very w et year Wet yearNormal year Dry yearVery dry year
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