Since the 2013 flood, modifications to the Bow River water management protocol were put in place to ease the impact of Calgary flooding. Reservoir capacity upstream of Calgary was reduced in the spring to allow for catchment of high flows during the spring of the year. Although this protocol would appear to give limited protection to the City of Calgary, the impact on the Bow River fishery has been enormous. In 2018, extreme fluctuations in flow had a serious impact on the sports fishery and may well have impacted the fish population itself.
Bow River Trout Foundation has documented the water management protocols, advocated to change to water management protocols and sees opportunities for change to stabilize water flows.
https://bowrivertrout.org/2018/08/26/the-state-of-the-bow-river-fishery-a-need-for-water-management-change/