Hydraulic Design of the Strontia Springs Diversion Damby H. W. Coleman, (M.ASCE), Harza Engineering Co, Hydraulic, Analysis & Design Section, Chicago, IL, USA,
C. Y. Wei, (M.ASCE), Harza Engineering Co, Hydraulic, Analysis & Design Section, Chicago, IL, USA,
The hydraulic features which were of primary significance for the project were the diversion tunnel and spillway. The low-level outlet valves and water-supply intake were relatively straight-forward designs and were more concerned with gate and valve details. Diversion was via a 15 ft (4. 6 m) diameter unlined tunnel through the left abutment around the dam. The tunnel was designed to flow open-channel for normal flows and under pressure for design discharge. The spillway consists of an ungated ogee near the crest of the arch, with a small flip-bucket just past the ogee. A shallow plunge-pool was pre-excavated at the base of the dam for energy dissipation. The spillway was not model tested, but was based on the design for the much larger Mossyrock spillway. Both diversion tunnel and spillway designs have been verified in operation with no problems.
Subject Headings: Spillways | Tunnels | Hydraulic design | Valves | Water intakes | Gates (hydraulic) | Open channel flow
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