Water in Celtic Countries: Quantity, Quality and Climate Variability (Proceedings of the Fourth InterCeltic Colloquium on Hydrology and Management of Water Resources, Guimarães, Portugal, July 2005).  IAHS Publ. 310, 2007, 224-231.

 

Water balance and observed flows in the Anllóns River basin (NW Spain)

 

M. ERMITAS RIAL RIVAS, MANUEL ALÍ ÁLVAREZ ENJO & FRANCISCO DÍAZ-FIERROS VIQUEIRA

Departamento de Edafoloxía e Química Agrícola, Universidade de Santiago, CP15782 Santiago de Compostela, Spain

edmitas@usc.es

 

Abstract During 2001, 2002 and 2003, several streamflow measurement surveys were carried out in the Anllóns River basin, as well as an integral study of its hydrological characteristics that has provided an important under­standing of its hydrological behaviour. The annual hydrographs for each hydrological year were obtained and their separation into the basic compo­nents: surface water and baseflow, were carried out. The baseflow component of streamflow was obtained by means of the HYSEP computer program (developed by USGS). The mean value of the groundwater recharge for the study period was 72% of the total streamflow of the river. At the same time, using the recorded precipitation and evapotranspiration values calculated with the data from the nearest meteorological stations, the soil water balance was calculated using the Thornthwaite and Mather methodology for each observed year. The results obtained have been compared with the observed data.

 

Key words  actual evapotranspiration; groundwater component; hydrograph separation; observed flows; streamflow measurement; water balance