As recent deluges in St. Louis and Kentucky show, flash flooding can happen in urban and rural areas, with deadly results in either setting.
A bridge and road submerged by floodwaters from the North Fork of the Kentucky River in Jackson, Kentucky, July 28, 2022. Leandro Lozada/AFP via Getty Images
People are also reading… If an area has had recent rainfall, the soil may be saturated to capacity and unable to absorb any more water. Flooding can also occur after a drought, when soil is too dry and hardened to absorb the precipitation. Flash floods are common in desert landscapes after heavy rainfalls and in areas with shallow soil depths above solid bedrock that limits the soil’s ability to absorb rain.
It’s critical to know where to get up-to-date weather information for your area. And if you’re outdoors and encounter flooded spots, such as water-covered roadways, it is always safer to wait for the water to recede or turn back and find a safer route. Don’t attempt to cross it. Flood waters can be much faster and stronger than they appear — and therefore more dangerous.
Often the design standards and rules that we use to engineer these features are based on historic rainfall data for the location where we’re working. Engineers use that information to calculate how large a culvert, pond or other structure might need to be. We always build in some excess capacity to handle unusually large floods.
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