What would happen to rivers if there was a lot of snow which did not melt?

If a significant amount of snow accumulates without melting, it can lead to increased snowpack, which may temporarily stabilize river levels. However, if the snow does eventually melt rapidly due to a sudden rise in temperature, it could lead to flooding as rivers receive an influx of water beyond their capacity. Additionally, prolonged snow cover can affect the timing and volume of river flow, potentially disrupting ecosystems and water availability downstream.