The Guadalupe River set a new all-time high in Hunt, Texas, this weekend after deadly floods inundated the region.

Texas Hill Country, where much of the flooding took place this time, is often referred to as “flash flood alley.” It's home to steep terrain and a lack of vegetation that creates a perfect storm for waters to rise quickly.

A hydrologist explains why Texas Hill Country is known as Flash Flood Alley and how its geography and geology can lead to heavy downpours and sudden, destructive floods