PHOENIX — .
"There are gonna be those times when you have two inches of rainfall in just an hour," Nintzel said."There is a lot of work that goes into getting the water off the freeways as quickly as possible.""The freeway is built with a cross slope towards the center and then it slopes to the outside, so that water drains off onto the shoulders, into our catch basins, ultimately into the drainage system," he said.
"A lot of the freeways are above ground level and that really helps with drainage in that if the roadway is higher, it goes into the drainage systems along the shoulder, and those drainage systems are gravity controlled. But in areas where were below grade, or below ground level, we need the help of the pump stations," Nintzel said."Those pump stations are designed to accept the water that's flowing into them.
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