To prevent this, the dam was designed and built to include a second emergency spillway.

They were also excavating an emergency spillway which was never completed.

South of the dam is the emergency spillway.

The first use of the emergency spillway due to flooding started on June 1, 2011 at 8:00am.

Since it became operational, the dam's emergency spillway has only been overtopped three times by unprecedented high water in 1973, 1983 and 1991.

The fuse-plug that allows the emergency spillway to work did not erode because heavy sediment had built up behind it.

There is also an emergency spillway at the west and which empties into a ditch.

The rainfall also caused extensive surface runoff in higher terrains which led to flow over emergency spillways.

An emergency spillway is designed for extreme conditions, such as a serious malfunction of the service spillway.

At this point any further flow into the lake is channelled over an emergency spillway to the west of the main dam structure.