Perpustakaan Digital ITB

Drawdown of groundwater table on mining over-burden disposal field had known will increase the disposal slope stability due to reduction on its inside effective stress. In fact, the drawdown has been happened because of the disposal drainage system and natural draining in dry condition. This paper would like to emphasize influence of natural sun-shining on the drawdown refers to disposal hydraulic parameter through negative-infiltration approach. A role model was running on the disposal layer with sandy clay loam as a study case. Final calculation resulted that it was needed 20 days left for declining the groundwater down to 2.25 meters. This conceptual model was expected to be an option of decision reference for mining operational to minimize some unnecessary vertical and horizontal drains.