PROJECT PROFILE Planned hydropower development at the Flannagan Dam in Haysi, Virginia involved permanent flooding of the ex- isting open-channel spillway tunnel under a hydraulic head of more than 200 feet. To evaluate the effects of pressurizing the 16-foot-diameter tun- nel, D’Appolonia was retained to deter- mine the condition of the surrounding rock and concrete tunnel liner. D’Appolonia planned and conducted an extensive in-sit

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