Campground repairs

I have a campground that went 15ft underwater during historic flood in 2018.  I had to replace all of my electrical system before I could reopen, so repair was required.  It was a 90K repair/improvement that I would like to takeover several years so where do I plug that into Turbo tax and how do I figure how many years to spread it over.  It was a declared disaster area but by the time SBA for individual businesses was declared I had already secured financing for repairs