To avoid flooding, an ideal spring runoff in Utah would need gradually warmer temperatures, but forecasts project the rain and snow will keep falling in the coming days.
there are more than 27 inches of water in this year’s snowpack.
A worst-case scenario would be temperatures jumping into summertime levels all at once during the late spring. That situation, when flooding turned State Street into a makeshift river, and mudslides consumed a town, highway and railroad in Spanish Fork Canyon, in addition to causing slides in Davis and Sanpete counties.
But there’s also a drawback to having the snowpack melt slowly, according to Jordan Clayton, supervisor for the“If the snow melt gets spread out over a really long period of time, we are going to lose a percentage of that water relative to if that melt happens over a short period of time,” Clayton said. “When you’re melting all this snow in a rapid period of time, your flood risk is much higher, so obviously, flooding is a concern.
“That’s going to be another statewide storm, with cold temperatures down through most valley floors, except for the St. George area,” Cheng said. An ideal spring runoff down south is the same as any other place in the state: nice and slow. Whipple said gradually warm temperatures would allow snow to melt from the bottom up — meaning snow in lower elevations would melt into rivers before moving to mid-level elevation snow and then high-altitude snow.The less-than-ideal runoff scenario would be high temperatures kicking in immediately.
A place like Cache Valley only has so many places for water to go, with only Cutler Reservoir to the west and Porcupine and Hyrum reservoirs to the south to soak up the runoff.
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