As recent deluges in St. Louis and Kentucky show, flash flooding can happen in urban and rural areas, with deadly results in either setting.
Salmon migrate thousands of miles from inland streams to the ocean and back. The newly enacted infrastructure bill includes funding to help salmon and other wild species on their way.
Bats roost under bridges and culverts across North America, so highway departments have to check for them before repairing bridges. A new AI tool makes those inspections faster and more accurate.
A recent US study found tyre chemicals were polluting rivers and poisoning migratory salmon.
Fish need to cross roads too. But the tunnels built to channel rivers under roads and railways can block their migrations.
The Victorians placed rivers in underground culverts to contain the smell and create new land for buildings.