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I'm working with a client who has a website that is relatively well optimised, thought it has a pretty flat structure and a lot of top level pages. They've invested in their content over the years and managed to rank well for key search terms. They're currently in the process of changing CMS and as a result of new folder structuring in the CMS the URLs for some pages look to have significantly changed. E.g Existing URL is: website.com/grampians-luxury-accommodation which ranked quite well for luxury accommodation grampians New URL when site is launched on new CMS would be website.com/destinations/victoria/grampians My feeling is that the client is going to lose out on a bit of traffic as a result of this. I'm looking for information or ways or case studies to demonstrate the degree of risk, and to help make a recommendation to mitigate risk.