Clogged storm drains pose flood risk after heavy snowfall Melting snow could cause your neighborhood to flood if storm drains are not clear, according to the Ada County Highway District. Here’s how to prevent it. Author: Chase Biefeldt (KTVB) Updated: 10:16 PM MST February 14, 2021 BOISE, Idaho — There are thousands of storm drains in the Boise area. If these get clogged, your neighborhood could be at risk for flooding. "I'm sure you've driven through an area with a huge puddle,” Nicole DuBois, chief communication officer for the Ada County Highway District (ACHD) said. “The reason that is happening is because the storm drain in the area is clogged with something and preventing that water from draining through."