There are a lot of rivers, streams and lakes to visit. For casual observers, it’s sometimes hard to tell how natural they are. Last year, I spent some time digging into all the ways that dams along the Saranac River change the flow of water and the life of fish.
But dams change something else, too: dirt.
Dams hold back and can suddenly release dirt, or they change the way water flows and those changes, in turn, change how sand and gravel build up both before and after dams’ spot in the river. Whole books, including the classic textbook Fluvial Processes in Geomorphology, have been written on these changes to dirt accumulation, usually known by the more technical word “sediment.”