What should be done to ensure separation when only written departure procedures are available?

Including the departure procedure in the clearance is crucial when only written departure procedures are available because it provides specific guidance for pilots on how to navigate from the departure airport while ensuring that all safety and separation protocols are maintained. By outlining the departure procedure, controllers can inform pilots of the expected flight path, altitude transitions, and any necessary communication protocols, thereby minimizing the risk of conflicts with other aircraft and enhancing situational awareness for both the pilots and air traffic control.

In a situation where written procedures are the only reference, it becomes even more important for the clearance to explicitly convey these directives to ensure that pilots can execute their departure safely and efficiently, adhering to established air traffic management rules and maintaining the required separation between aircraft.