Sedimentation and erosion studies in Wilson Creek Watershed, Manitoba, with particular reference to shale bank retreat
Wilson Creek Watershed is located on the eastern slopes of Riding Mountain National Park in Manitoba and covers an area of 8.18 square miles. It contains two main streams-- Packhorse and Baldhill--which join to form Wilson Creek at the foot of the Manitoba Escarpment. Field data collected from 1964 to 1974 show that the 47 shale banks are the main source of sediment. The shale banks are eroded in horizontally bedded calcareous shale that weathers to produce screes at their bases... Longitudinal profile determinations revealed a general rise in stream bed. Degradation and aggradation studies show that lateral erosion was more extensive than vertical erosion and aggregate deposition was three times greater than aggregate erosion... Within the Watershed, log cribs and rip raps are the most effective bank protection methods. Revegetation by willows is valuable in promoting shale stabilization. The sediment trap at the foot of the escarpment is not only a flood control device, but an efficient system for monitoring bedload.