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flood

Flood above Elbow Falls

Flooding

Photos of Bragg Creek flooding June 7-8, 2005

Photos of Kananaskis Flooding June 8, 2005

The majority of the Hamlet of Bragg Creek is located on the south side of the Elbow River, within a low terraced area. Since the establishment of first settlements in the Bragg Creek area, the Elbow River has been prone to flooding. These floods have caused widespread property damage, including destruction of buildings and bridges. In one instance, the death of one inhabitant was attributed to flooding on the Elbow River.

HISTORIC FLOODS

Flooding in the Elbow River basin may be caused by snowmelt, rainfall and snowmelt, or rainfall alone. The largest floods have occurred during a combined rainfall and snowmelt event. Flood events due to rainfall alone are not common.

Historic floods have been observed on Elbow River from as early as 1915. This was particularly evident with the washing out of the bridge crossing at Bragg Creek in 1915, 1916, 1929 and 1932.

The 1932 flood is the largest recorded flood, with an estimated peak instantaneous flow of 836 cubic metres per second (m3/s) at Bragg Creek. This flood had the widest impact on property and residents in the study area. In addition to the bridge, the flood also destroyed the post office, a two story store and resulted in the death of one inhabitant. Since 1932, peak instantaneous flows on the river have been reported at 267 m3/s in 1948 and 268 m3/s in 1963.

Following the 1963 flood, an artificial levee was constructed on the south bank of the river to protect the Bragg Creek Trading Post from future flooding and to protect the bank from erosion. This levee was constructed by piling up river gravel and covering it with a 1.5 m blanket of 0.5 m diameter riprap material. This levee acts as a. deflector dike on the main channel and has, to date, protected the. Trading Post from flooding.

There have not been as many reported incidents of flooding on Bragg Creek. Flooding has occurred over the left (north) bank both upstream and downstream of the Elgin drive bridge. Subsequently, a dike was constructed on the left bank, upstream of the bridge, to contain flood waters.

RECENT FLOODS

In recent years, the largest floods on the Elbow River have occurred in 1967 and 1990. Other than these two years, the annual spring runoff flood has not been unusually high in comparison with flows recorded in the first half of the century. The 1967 flood is the largest flood in recent history and was observed to have an estimated instantaneous Peak discharge of 283 m3/s at Bragg Creek corresponding to about a 10 year flood event.

The 1990 flood was observed to have a peak instantaneous discharge of 172 m3/s. This is equivalent to approximately a 5 year flood event, and was not observed to impact on any property in the area. However, this is the most recent flood for which good flow and depth data arc available.

Ice jam floods on either the Elbow River or Bragg Creek have never been reported.