Rainfall

The objective of the present section is to perform information about the rainfalls recorded at the Guadalquivir River Basin (GRB) and to report about the hydrological conditions of the current year to the citizens. For this purpose several periodic reports are presented where all the process of data treatment, validation, kriging interpolation for the surface distribution and map algebra operations to characterize rainfalls are explained.

Rainfall characterisation of Guadalquivir River Basin

According to the historical records of total annual rainfalls in GRB all the area can be divided in three big domains:

• a) The domain where the rainfall is more than 700 mm /year situated in highlands area of GRB, particularly in the Western part of Sierra Morena, Sierras Subbéticas, Sierra of Aracena and Cazorla-Segura. The last one represents a vast area where the annual rainfall is more than 1000 mm.
   
• b) The second domain includes the mayor part of GRB (Guadalquivir Valle and rest of Sierra Morena) where the rainfall is between 700 and 500 mm per year.
   
• c) The third domain (annual rainfall less than 500 mm) includes the depressions and interior high plateau of Beticas mountains chains due to obstacle effect of this lasts hindering pass of the wet and disturbed flows from west. This is domain of dry and semidry areas.

At the following map the average annual rainfall in GRB is presented:

In spite of heterogeneity of total rainfalls there are some common characteristics for the all GRB. First of them is summer water shortage that affects all the territory. Second one is a predominance of lasts of autumn and beginning of winter rainfalls under rainfalls in other seasons. Other one consists in the fact that accumulated rainfall is generated by the reduced number of rainy days (represents just a 25% of all days in the year). A last common characteristic consists in high irregularity of rainfalls in different years: from highly wet to extremely dry. Moreover, the persistence of water deficit situation is very common where the isolated dry years are not usual but normally joining this lasts in extended sequences which in some cases was longer than nine continues years.

Rainfall Reports

In this section the month rainfall reports can be downloaded.

1. 2012
2. 2011
3. 2010
4. 2009

Name	Type	Link
April 2012 Report
March 2012 Report
February 2012 Report
January 2012 Report