Bar dam has been constructed in northwest Neyshabur city, off-stream Bar river to provide the urban drinking water and Neyshabur steel factory water demand, respectively. The water balance of the Bar dam has indicated 35-70% water seepage from the dam reservoir during
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Bar dam has been constructed in northwest Neyshabur city, off-stream Bar river to provide the urban drinking water and Neyshabur steel factory water demand, respectively. The water balance of the Bar dam has indicated 35-70% water seepage from the dam reservoir during six trial water intakes. The significant seepage, high concentration of solutes in the leaked water, impact on water resources planning and projected allocations threaten the stability of the Bar dam. Analysis of the observation wells hydrograph indicated major water seepage from the central part of the foundation of the main dam site and minor seepage from other areas. water seepage modeling using MODFLOW software showed that 75% of the volume of the leaked water passed through the foundation of the main dam site. Furthermore, the chemical analysis of the leaked water samples indicated an increase in total dissolve solids to more than 5 to 10 times, especially in the central and left areas of the dam reservoir. The amount of the dissolved material due to water seepage from the main dam site was calculated based on the data collected from the modeling of water seepage from the dam reservoir, results of hydrochemical sampling, time series analysis of the seepage rate, and mass balance of the dam reservoir water. Finally, the effect of dissolution on the increase of porosity was investigated and based on the results,the maximum annual development of porosity in the middle part of the main dam axis was about 0.06%.
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