<p>Reservoir plays a pivotal role in various agricultural and industrial activities through the construction of hydraulic structures like dams, canals, barrage, tanks, etc. Mostly dams constructed in the past did not have adequate design methods, sophisticated techniques for ground investigation etc., hence their safety is a major concern. Efficient dam management practices demands incorporation of adequate seepage control measures in order to ascertain dam safety. This can be achieved by timely investigation of excessive and uncontrolled seepage and their flow paths. Several problems related to hydraulic structures across the globe have been reported and suitably dealt with in the recent past by adopting borehole logging and tracer study. In the recent past, across the globe, several problems related to hydraulic structures have been reported and suitably dealt with by adopting borehole logging and tracer studies. They form an integral part of nondestructive technique(s) (NDT) toward delineation of weak zones through hydraulic structures, identifying source and path of seepage. In order to take up diagnostic studies, and to identify or determine the cause of seepage, site selection is an important criterion. Based on site suitability and feasibility, recommendation for drilling of borehole(s) is provided in order to perform logging and tracer studies to decipher weak zones prone to seepage through dams.</p>