Printed from: https://www.conservationhandbooks.com/waterways-wetlands/dams-weirs-and-sluices/factors-to-consider/
Environmental effects How will the installation affect existing habitats? Dams frequently flood wetlands upstream while at the same time drying out wetlands below. Even minor impermeable banks across marshes, bogs or wet heaths may subtly alter drainage patterns, often to the detriment of existing communities of plants and animals. This may be balanced to some...