Storm water drainage liability

[Bryan Cork]

Legal question: if property A is uphill from property B, and Property A has a culvert type of system that feeds into a pipe and dumps storm runoff into property B and that runoff is causing erosion issues for property B is Property A liable to rectify the problem in any way?

Property B is a 4 plex and I am one off the owners. This is in Colorado, and property A was built in 1997, and property B was built in 2001. So I don’t know if the culvert/pipe system existed before or after property B was constructed. Thank you!