A CTLR RPTS THAT PLTS DEPARTING ON THE MEM 7 DEP FREQUENTLY CONTACT TRACON ON AN INCORRECT FREQ.

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ABCXX DEPARTED RWY 18L WITH AN INITIAL ROUTING OF J42 EBOUND AND CHKED IN ON THE W DEP FREQ. ABCXX WAS QUICKLY INSTRUCTED TO CONTACT THE E DEP CTLR ON THE PROPER FREQ. TSTMS WERE IN THE AREA; AND THE FACILITY WAS USING MANY NON-STANDARD OPS TO HELP TFC AVOID THE WX AND GET ON COURSE AS SOON AS ABLE. THE LAST THING CTLRS NEEDED WAS ACFT ON THE WRONG FREQ BECAUSE OF A CONFUSING DEP PROC. THE MEM 7 DEP NEEDS TO BE REWRITTEN MORE CLRLY SO THAT PLTS WILL MORE EASILY IDENT THE PROPER DEP FREQ. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATED THAT THIS PLT ERROR IS AS COMMON AMONG ACR PLTS AS IT IS WITH GA PLTS. THE RPTR STATED THAT AN OPERROR OCCURRED AFTER A PLT DEPARTING W CONTACTED TRACON ON AN E FREQ AND THE CTLR NOT LISTENING TO THE CALL SIGN CLOSELY HEARD WHAT HE WANTED TO HEAR AND TURNED THE WBOUND TFC TOWARD THE E INTO AN E DEPARTING ACFT OFF THE PARALLEL RWY. RPTR STATED THEY FELT VERY LUCKY THAT THE PLTS WERE VMC AND ABLE TO SEPARATE THEMSELVES THUS PREVENTING AN AIRBORNE ACCIDENT. THE RPTR STATED THAT THE CHART FORMAT IS CONFUSING AND SHOULD BE CHANGED.