How much water do you have to drain? Do you have a lake in your back yard? A decent sump pump can make pretty fast work of it with a little time and if there is a place to pump it.
Well here's my problem. A pipe burst up my street two years ago and the natural flow of water went directly across my driveway, the sidewalk, between my house and my neighbor's house and then down a hill. It sunk my land to the point where now the end of my driveway (about a 10x15 area) holds water, the sidewalk holds water and then some of it sits on the grass between our houses. It's a lot, too. Like... a comical amount. It also now can't reach the storm drain inlet on the grass between my sidewalk and the street. It's also so spread out then I don't think there's a solution for just one area. This water also flows down into a neighbor's house behind me and turns their backyard in a virtual lake after the weather the last 24 hours.
So that’s another problem. The street has no curbs or standard storm drains. We mostly have a lot of culverts and drains in the grassy area between sidewalk and street. That’s the area I’d need to get water to but it would likely involve something going over or under the sidewalk.