From Eos – Science News – Nationwide, civil engineers consider precipitation values from NOAA to design their structures. But those values are missing another contributor to flood risk: snowmelt. California’s Oroville Dam holds back a reservoir that provides water for 23 million people. In February 2017, rainstorms doused the area and filled the reservoir beyond its normal capacity. Excess water was released through the main spillway, but the structure failed, and 188,000 people living downstream evacuated to avoid potential floods. Snowmelt was one of the factors that figured into the spillway failure at California’s Oroville Dam in 2017. (more).