Dams wear down over time, increasing upkeep costs, but questions remain about how removing a dam affects the surrounding area. To help get a better grasp on the issue, Dartmouth College geographer Frank Magilligan and his team are collecting data about the effect of removing the Homestead Dam from the Ashuelot River in Swanzey, N.H., using laser-based tools and GPS devices. "What we have also seen from some of our field analysis is that there's been a couple of feet of bank erosion in some places. In other places, we see up to a couple of feet of bank deposition as well," he said.
Published in Brief: