Factors In Evaporation
July 12, 2010, 4:57 PM
The amount of time it will take for parts of KELOLAND to dry up depends on three factors: air temperature, humidity, and wind speed.
Evaporation rates increase as the temperature increases. Studies show that when the temperatures climbs 50 degrees, the evaporation rate doubles. So as the temperature goes up during the afternoon, water evaporates faster.
Humidity also affects the evaporation rate. It's easier to add water from evaporation to dry air compared to air that already has a high water content.
Of course, KELOLAND wind also helps dry things out. On a calm day, as water evaporates, it increases the humidity immediately around it and slows down the process. But when the wind blows, the air around the water is constantly replaced with drier air. This, in turn allows the water to dry up quicker.
And it's times like this when flooded land needs good old South Dakota wind to help dry things out. But it's a thin line, we're getting to the time of year when water is good to have around, because the summer months can sometimes bring in long lasting dry and hot spells.
9/25/2014 10:00 PM
Miracle on the highway: that's how many people are describing a bad crash between a semi-truck and car in which no one was killed.
9/26/2014 4:55 PM
Friday night's homecoming at Brandon Valley High School is a crowning achievement for a senior who's living with autism.
9/28/2014 11:42 AM
Prosecutors may file additional charges because a western Iowa teen died two days after suffering a head injury during a fight at school.
9/30/2014 5:00 PM
Two people are hurt, one seriously, after a chain-reaction crash in eastern Sioux Falls involving a semi-truck and four other vehicles.
9/26/2014 6:39 AM
Sioux Falls police say a missing boy showed up for school Friday morning.