A COMMUTER E120 FLC MEMBER RPTS FOLLOWING A TKOF CLRNC AT DFW THAT TOOK THE ACFT THROUGH THE WAKE OF A PRECEDING ARRIVING MD80; WHICH WAS ON AN INTERSECTING APCH PATH. AT APPROX 50 FT ABOVE THE RWY; THE COMMUTER ACFT ROLLED BTWN 5 AND 10 DEGS ON ITS LONGITUDINAL AXIS.

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WHILE DEPARTING DFW WITH S FLOW; WE WERE CLRED INTO POS RWY 13L. AN MD80 WAS LNDG RWY 17L. APPROX 20 SECONDS AFTER THE MD80 CROSSED OUR RWY; WE WERE TOLD '(CALL SIGN) CLRED FOR TKOF RWY 13L; CAUTION WAKE TURB; ARRIVING MD80 RWY 17L.' WE WAITED ABOUT ANOTHER 15 SECONDS BEFORE INITIATING TKOF; BUT COULD NOT WAIT MUCH LONGER DUE TO ANOTHER ACFT ON FINAL RWY 17L. TKOF PROCEEDED NORMALLY UNTIL APPROX 50 FT AGL WHEN OUR ACFT ENCOUNTERED THE WAKE OF THE MD80. OUR ACFT SUDDENLY ROTATED 10 DEGS TO THE R AND BANKED 5 DEGS TO THE L. A MODERATE BUMP WAS ALSO FELT. THE REMAINDER OF THE FLT PROCEEDED NORMALLY. THIS IS A RECURRING PROB AT DFW. IT HAS STARTED WITH THE OPENING OF THE NEW RWY 17L/35R. ADDITIONALLY; THE PROP DRIVEN AIRLINERS ARE CONTINUOUSLY FORCED TO FLY LOWER (SOMETIMES BELOW CLASS B AIRSPACE) AND ASKED TO DO THINGS THAT WOULD NEVER BE ASKED OF A PAX AIRLINER ANYWHERE ELSE IN THE UNITED STATES. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: WHEN ASKED IF HE KNEW OF ANY SIMILAR INCIDENTS; THIS RPTR STATED THAT HE ENCOUNTERED A MORE CRITICAL SIT INVOLVING DFW S FLOW OPS AND THE SAME RWYS; JUST 2 WKS AGO. THE RVR WAS 2000 FT AND HE HAD BEEN CLRED FOR TKOF ON RWY 13L; AGAIN; WITH AN ACFT ARRIVING ON RWY 17L. HE WAS CONCERNED ABOUT HOW THE CTLR DETERMINED THAT WAKE TURB CRITERIA WAS MET; SINCE HE WOULD NOT SEE OR DETECT THE LOCATION OF THE OTHER ACFT (TCASII DOES NOT WORK ON THE GND).