This paper is intended to review the approach and principle on hydraulic flushing, field implementation and a variety of the case studies of using hydraulic flushing: A Tool for Sediment Management in Reservoirs. It examines different kinds of flush (isolation valve, water hammer, scavenger, back-pulsing and dredging), measuring their sediment removal capability and the technical and ecological issues concerning such a remedy. Moreover, this review not only summarizes the success stories of globally implemented hydraulic flushing projects but also discusses the knowledge gaps in the current literature that may provide potential insights to improve future sediment management practices. Following a brief introductory section that describes sedimentation issues in reservoirs, this paper presents a detailed discussion of the principles of hydraulic flushing. The most relevant factors defining such an approach efficiency (reservoir topography, physical and chemical sediment characteristics, discharges and flushing times) are considered along each reservoir's cascade capabilities. The paper also considers the different nature of flushing options used in various schemes, including continuous flushing, and sequential flushing, but also density current flushing, in which techniques have efferent advantages and are designed for very different conditions within storage facilities. On the other hand, although the advantages of hydraulic flushing are presented with the advantages, it should also be emphasized that it cannot be done randomly, and it is the only solution. The potential environmental impacts to consider such as increased downstream turbidity from future water bodies or impairments to potable systems, should guide planning processes and develop technologies to mitigate potential impacts. The constraints include potential conflicting interests with downstream water users as well as restrictions imposed by the physical morphology of the reservoir and heterogeneities in the composition of the sediments and must be balanced as much as possible when deciding whether to adopt flushing operations. Moreover, flushing operation planning, execution, and sustainable monitoring are monetarily driven, and hence, examining costs and benefits with existing resources adds another aspect to decision-making for flushing operations in pipelines