Evaluation and Impact of the Content of heavy Metals, Present in the Residual waters used for Watering of the Favara Canal

In the waste water irrigation transposed through the Favara Channel in the Huena of Valencia was evaluated their quality by means of the Spain Laws (BOE, 1986), the rule 76/464 European Union (CEE, 1976) and the guidelines FAO (1985) to determinate the potential impact in soils and crops The waters survey were done since December 2000 until June 2002 During this time period 300 waters survey were collected to determinate the Cr Cd Ni and Pb concentration by means of AAS. The waters quality showed than the maximum and averages concentrations are out the limits used for their evaluation. The statistical analysis showed significant differences in the waters survey, then it declares than the concentrations have an unquestionable variability in each survey during this time period. The continuous use of this water could generate potential risks of contamination and toxicity in soils and crops