Anyone any experience in methods used to separate departures against an arrival who will fly a dme arc leading to final approach?
Yes.
Basrah Airport, in the south of Iraq. We have a waypoint (WOGET) which is the IAF for a DME arc leading to both the ILS 32 and VOR approach 14. The waypoint is 15 DME from the VOR (which is on the Airport) at 90 degrees to the runway axis. There is a hold associated with the waypoint.
Traffic departing 14 or 32 is deemed separated from traffic either holding at WOGET or inbound to the same runway as the departure, established on the arc, PROVIDED the departure flies runway heading until vertical separation is achieved.
Hope this helps