Abstract

The decline or drying up of groundwater sources near the tunnel route is damaging to groundwater users. Thus, forecasting the impact of a tunnel on its nearby groundwater sources is a challenging task in tunnel design. In this study, numerical and analytical approaches were applied to Qomroud water conveyance tunnel (located in Lorestan province, Iran) to assess the impact of tunneling on its nearby extraction water wells. Using simulation of groundwater level fluctuation due to tunneling, the drawdown at the well locations was determined. From the drawdowns and using the Dupuit's equation, the depletion of well flow rates after tunneling was estimated. To evaluate the results, observed well flow rates, before and after tunneling, were compared with the predicted flow rates. The observed and estimated water well flows (before and after tunneling) showed a regression factor of 0.64, pointing to satisfactory results

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