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San Antonio sits at the edge of the Texas Hill Country in south-central Texas, a region prone to sudden, intense flash flooding that has earned the nickname Flash Flood Alley for how quickly limestone terrain and thin soil send storm rainfall rushing downhill. Hot, mostly dry summers give way to bursts of severe spring and fall rain that can drop several inches in an hour. Gutters and downspouts built for sudden, high-volume runoff matter throughout San Antonio's Hill Country-adjacent neighborhoods far more than systems sized for a milder, steadier climate.