Practical Engineering on MSN

This small dam can control an entire river - but during a flood it can make things worse

A weir is a small hydraulic structure built across a river to control the upstream water level while allowing water to flow ...
Yahoo

A small northern Michigan dam failed. Others are increasingly at risk.

Add Yahoo as a preferred source to see more of our stories on Google. A small dam in Alcona County has already failed. Emergency management officials are watching at least seven other northern ...