What is "deroche"

Deroche is a farming and railway community on the Canadian Pacific Railway and BC Highway 7 located approximately 110 km east of Vancouver, British Columbia, Canada. Deroche is adjacent to the eastern end of Nicomen Island, from which it is separated by the Nicomen Slough (NB a different location 3 km away was known as Deroche Landing). The community is at the foot of Nicomen Mountain and is immediately across the river from Chilliwack Mountain. The population of Deroche is about 148.