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MECAR - Metodologia para a estimativa de água de rega em Portugal
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Resumo(s)
Under the European system of agri-environmental indicators, the Council of
the European Union recognized the need for comparable data on agricultural
activities, especially with regard to farm management practices and use of
agricultural inputs, including the use of irrigation water, having been enshrined
this principle in the Regulation (EC) 1166/2008. To meet this legal requirement,
established a partnership between the INE and ISA / CENTROP to develop the
MECAR - Methodology for Estimating Irrigation Water in Portugal. After the
comparative approach of different methodologies, it was considered that the
use of estimation models based on water balance would be the best approach
to achieve these objectives.
The methodology was based on soil water balance, which is done by the
mathematical model ISAREG (Teixeira and Pereira, 1992 and Teixeira, 1994),
which is based on the procedure of the FAO (Doorenbos and Pruit, 1977 and
Doorenbos and Kassam, 1979) determining the water requirements of crops,
which apply correction factors for loss of efficiency that stem from the
characteristics of irrigation systems used and the conditions of irrigation,
particularly in their management of their respective owners.
The validation of results produced by MECAR, to prove that the volumes obtained
by simulation were located close to the actual values, it was considered
satisfactory. However, it is recommended that a second validation be performed,
comparing the annual simulated data recorded by the irrigation farmers
associations and individual farmers for the same period.
The application of MECAR to actual data from IE 2007 is an operational test of
this solution is adequate as it allowed to obtain reliable information and consistent
with the requirements of the regulation.
Descrição
Palavras-chave
soil water balance crop water requirement ISAREG irrigation water irrigation systems irrigation water volume efficiency correction factors