What are the bases for the principal and emergency spillway capacities?
a. Principal Spillway Once the principal spillway crest elevation has been established from the sediment calculations, the combined capacity of the spillway riser and pipe through the dam should be designed for one of the following applicable conditions: i. For discharges into non-I/HQ waters the 2-year, 24-hour storm is routed through the pond and spillway ii. For discharges into I/HQ waters, the 5-year, 24-hour storm is routed through the pond and spillway. b. Emergency Spillway Starting with an initial pond elevation at the principal spillway riser, the 25-year, 24-hour flow is routed through the pond, giving outflow credit to both the principal and emergency spillway discharges, to determine the maximum flood level (25YR-FL). The emergency spillway crest elevation should be set a minimum of 1 foot above the routed 2- year flood level (2YR-FL) or 5-year flood level, as appropriate. c. Top of Dam (crest) The dam crest elevation is established by adding a minimum freeboard of 1 foot t
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