Ground water drawdown and land subsidence in Garmsar - Eyvanekey regions

Garmsar and Eyvanekey plans are located south of central Alborz, between north central Iran, and to connect mountains with basins. the existence of alluvials of arise from Alborz mountion erosion created aquifers, geological investigation firm that evaporates and salt dooms of upper and lower red formation cause of increase salinity and thus sulfat solution in alluviu, this subject effect in increased porosity of sediments. Measurement of piezometric wells show ground water drawdown in the last 18 years, and this subject on the basic of procedure exploitation in the 30 years is similar. Calculations based drawdown at least 27 meters of ground water table caused about 50 60 cm subsidence, and 20-30 cm. subsidence due 20 years at next. Calculation ground water depletion produce surface cracks, deep fractures anddamage buil ings. It necessary attention to water management and geological engineering specifications in contracture project at future