Rain water washing out sand under my driveway

Asked April 17, 2017, 6:19 PM EDT

My back yard sloops down to home, swale pushes water around home ( no water problem in home) but water goes around and .straight under driveway and washs out sand under drive and drive is sinking. Sand runs down onto sidewalk and piles up. Also, neighbor's yard slopes toward my driveway so additional water from that yard, in addition, the city has sewer running deeper in same spot with street water runoff
what can I do about this problem?

Polk County Iowa

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