HYDROLOGICAL AND CHEMICAL MANAGEMENT IN THE REHABILITATION OF AN AQUIFER

The management of coastal aquifer groundwater must take into account n atural hydrological, biological and chemical parameters, as well as th e development of anthropogenic stresses. Such stresses may result from : 1. degradation of groundwater quality due to introduction into the a quifer of pollutants from diffuse sources (e.g. seawater intrusion, ag ricultural activity, etc.) and/or point sources (landfills, sanitary d evices, industry, etc.); 2. hydrological deficits which may cause an u ndesirable groundwater flow regime and groundwater recirculation probl ems; 3. interrelated chemical-hydrogeological processes. Water, contam inated to various degrees, migrates through rocks having heterogeneous properties. Thus, distinct bodies of water appear in the aquifer spac e.A characteristic situation is demonstrated in the Hadera region of t he Israeli Coastal aquifer. Efficient quality control requires the app lication of surface and underground management programmes. The objecti ve is an improvement in the aquifer water budget and a reduction in th e input of harmful chemical and biological pollutants.