Скачать или смотреть Kayaking the Enoggera Reservoir, The Gap, Brisbane. Australia

From SEQ Water Webasite:
Built in 1866, Enoggera Reservoir is the oldest reservoir in Brisbane. It was the third largest dam built in Australia in the 1800s and was one of the three dams constructed to store water for Brisbane’s growing population from 1864 to 1916.

In 1976, the concrete spillway was added and the embankment raised for flood mitigation. Enoggera has a two-level spillway. The lower level has two rectangular culverts that tunnel under the concrete crest. When the full supply level is reached, water flows through the culverts and out of the dam. The upper spillway has a concrete ogee crest. During major floods, water will also flow over the upper spillway.

Enoggera is an un-gated dam, meaning that when it reaches 100 per cent capacity, water flows over the spillway and safely out of the dam.