Iceland is one of the only countries in the world that can claim to have a completely clean energy portfolio. The demand for hydropower is still increasing, and Iceland has dammed many of its rivers to meet this need at the expense of their riparian ecosystems. The regulation of flow regimes and creation of reservoirs has had a significant impact on the ecosystems in and around the rivers of Iceland. The Blanda River has been utilized for hydropower since the early 1990’s, and will be used to model the effect of the dam on the downstream flow regime using Digital Elevation Modeling and Flow Accumulation. By using these models along with river flow data, we will be able to analyze the effects felt as a result of the dam.