Stream crossings—culverts and bridges—are critical infrastructure for field and farm access. But if undersized or poorly installed, they can be a problem because they impede or block fish passage to ...

Unfortunately, this book can't be printed from the OpenBook. If you need to print pages from this book, we recommend downloading it as a PDF. Visit NAP.edu/10766 to get more information about this ...

The National Academies of Sciences, Engineering, and Medicine are private, nonprofit institutions that provide expert advice on some of the most pressing challenges facing the nation and world. Our ...

The aim in highway drainage is to prevent on-site water standing on the surface and convey the off-site storm runoff from one side of the roadway to the other. To accomplish the off-site drainage ...

Part of Portsmouth Street in Concord is closed as work continues on a bridge across from the lot of the Society of N.H. Forests. Credit: GEOFF FORESTER / Monitor staff The City Beat is a free Monday ...

With a little bit of effort and the right stone material, a culvert can become the showcase of your property. Learn how to build a culvert bridge, or a dry-stacked stone driveway that functions and ...

Fish need to move to find food, escape predators and reach suitable habitat for reproduction. Too often, however, human activities get in the way. Dams, weirs and culverts (the tunnels and drains ...