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The lower levels will allow crews to complete repair work for a concrete spillway for the Old Mill Pond, which has undergone years of repair work after a 2015 dam failure emptied the once notable ...
If inflow to the reservoir exceeds the gate's capacity, an artificial channel called an auxiliary or emergency spillway will convey water. Often, that is intentionally blocked by a fuse plug . If present, the fuse plug is designed to wash out in case of a large flood greater than the discharge capacity of the spillway gates.
Stepped spillways are useful for flood control, increasing dissolved oxygen (DO) levels downstream of a dam, aid wastewater treatment plants for air-water transfer of gases and for volatile organic compound (VOC) removal and reduces the spillway length or eliminates need for stilling basin.
The south end of the Red Mill Pond dam in Tecumseh is pictured Thursday. The Lenawee County Drain Commissioner's Office is preparing a repair and realignment project for the dam's auxiliary spillway.
An emergency spillway with fuse plug (bottom) and an auxiliary ogee spillway (top) at New Waddell Dam. A fuse plug is a collapsible dam installed on spillways in dams to increase the dam's capacity. The principle behind the fuse plug is that the majority of water that overflows a dam's spillway can be safely dammed except in high flood conditions.
2. The emergency spillway, which has a 30 ft (9 m) high concrete wall at the top of a hill, is unused. Despite concerns that the emergency spillway is vulnerable to erosion, a $100 million request by environmentalists to upgrade it to a concrete-lined auxiliary spillway is rejected by the federal regulators. Craters appear in the main spillway.