End report on Bow River flooding

Bram Wennekers describes the results of his 6-month-study in Calgary, AB.

"With the help of a scholarship from ACSN I went to Calgary (AB, Canada) and did my internship at the University of Calgary on sediment transport in the Bow River. I will provide a short abstract of my internship to tell about the study, but next to that I also had a great time after working hours in Calgary and surroundings. ACSN, thanks for offering me this scholarship and the opportunity to go to Canada!

During the flood of June 2013 the City of Calgary got intensely flooded by both surface water from the Bow and Elbow River, and groundwater seepage. Estimated damage is in the order of billions of Canadian dollars, since a major part of downtown got flooded, and (rail-)roads and other infrastructure got disrupted or flushed away by the water. Also a lot of homes and home basements got flooded and during the last decades people started to use their basements as a second living room. Electrical appliances are stored in the basements, which contributed to the high damage costs of the flood. This research mainly consists out of two parts: (1) a literature review of catchments around the world that have or had to deal with flooding as well and (2) a modeling study with Delft 3D to investigate the sediment transport in the Bow River during several discharges and possible mitigation techniques. The literature review produced seven main mitigation techniques: flow diversion, storage, buy outs, rate paying, levees, public involvement, and gravel control. Applications in the researched catchments and possible implementation in the Bow River are investigated. The modeling study revealed, depending on the chosen scenario, doubled erosion and sedimentation rates. Most of the scenarios do show these differences at more or less the same locations in the river, such as the first inner bend, the bridge at 10th Street NW and the scour hole just after the Peace Bridge."