8.1-Aquifer characteristics in karst topography.

Abstract

The study describes briefly the variations in determining aquifer potential parameters in mountainous areas adjoining sea. The hydrogeology of the area is generally characterised by the maximum 100 m horizon pleistocene recent deposits over a maximum 300 m horizon of miocene-pliocene formation with the underlying base of the miocene formation unknown. The time series of water levels in the tube wells show generally decreasing trends. The estimates of storage coefficient and transmissivity by Jacob's straight line approximation method, Theis single well recovery method and Logan's approximation method with or without taking into account well losses show much variations for these limestone aquifers. The application of Ghyben-Herzberg relationship shows that the tube wells are not at risk of sea water intrusion and the static water levels in the wells are generally 6m above mean sea level.