ACR X GAR BECAUSE OF OCCUPIED RWY HAD CONFLICT WITH Y.

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X ON VISUAL TO RWY 36 IN DCA; WE WERE 3 MI INTRAIL OF AN EXECUTIVE JET LNDG ON RWY 33. TWR CLRED ACR Y ACFT FOR TKOF AFTER THE TFC LANDED ON RWY 33. I BELIEVE HE WAS TOLD TO 'KEEP THE PWR UP; YOU'LL GO RIGHT OUT.' AT 400 FT AGL WHEN IT WAS OBVIOUS THAT WE WOULD TOUCHDOWN PRIOR TO Y'S TKOF HAD BEEN COMPLETED; WE INITIATED GAR AND INFORMED TWR. TWR'S RESPONSE WAS BLOCKED. WE TURNED L TO 340 DEGS TO PARALLEL RIVER AND AVOID RESTR AREA. TWR THEN CALLED BACK AND CALLED 'R TURN 050 DEGS' IN AN EMPHATIC MANNER. AFTER INITIAL TURN TO R; TWR; IN A TONE BORDERING ON PANIC; ALERTED US TO TFC TO THE R; VERY CLOSE. THIS WAS THE DEPARTING ACFT FROM RWY 36; CLBING THROUGH APPROX 500 FT AND ABOUT 1/2 MI PAST THE DEP END OF RWY 36. OUR R TURN TOOK US ABOVE AND BEHIND HIM AS HE TURNED L TO HEAD UP RIVER AS PER STANDARD DEP FOR RWY 36. WE KEPT HIM IN SIGHT AND PASSED ABOUT 1000-2000 FT ABOVE AND BEHIND; CROSSED OVER THE RIVER AND CLBED TO 2000 FT HDG 180 DEGS. THIS POTENTIALLY DISASTROUS SIT WAS AVERTED DUE TO GOOD WX. HAD WE BEEN IMC IT COULD HAVE BEEN CLOSER. IT SEEMS TO BE STANDARD PRACTIVE AT DCA TO KEEP TIGHT INTERVALS DUE TO TFC REQUIREMENTS. HOWEVER; TO USE NONSTANDARD TERMINOLOGY IN HOPES OF EXPEDITING DEPS OR DELAYING ARRS GIVES THE CTLR A FALSE SENSE THAT HE IS HELPING SPACING WHEN HE IS NOT. CALLS SUCH AS 'KEEP THE PWR UP; YOU'LL GO RIGHT OUT; 'BE READ TO GO'; 'SQUARE YOUR TURN TO FINAL' ARE HEARD FREQUENTLY. PLTS WILL OPERATE THEIR ACFT ACCORDING TO NORMAL PROCS FROM THEIR MANUALS AND COMPANY PROCS; DESPITE CALLS SUCH AS THOSE MENTIONED. TO DECREASE SPACING AND RELY ON THESE FRIVOLOUS INSTRUCTIONS TO BAIL THEM OUT IS NOT SAFE. WE WERE TOLD TO 'S-TURN' AT 700 FT. HOW DO YOU 'SQUARE THE TURN TO FINAL' ON THE RIVER VISUAL TO RWY 18? SUPPLEMENTAL INFO FROM ACN 293748: THIS GAR RESULTED IN A DANGEROUS SIT WITH THE ACFT TAKING OFF AND A NEAR FLT BY PROHIBITED AREA P-56; THE WHITE HOUSE. THE FO WAS FLYING AS WE BEGAN A VISUAL APCH TO RWY 36 TO FOLLOW AN EXECUTIVE JET 3 MI AHEAD LNDG ON RWY 33. 2 MI AHEAD OF HIM WAS A COMMERCIAL JET LNDG ON RWY 36. WE WERE TOLD BY DCA TWR A RWY 36 DEP WOULD OCCUR AFTER THE EXECUTIVE JET LANDED. THE DEPARTING FLT WAS A COMPANY SHUTTLE; AS WE WERE. WE SAW IT WOULD BE CLOSE. AT 400 FT ALT I ORDERED A GAR. THE COMPANY FLT WAS 1000 FT DOWN THE RWY ON TKOF. I CALLED THE TWR SAYING WE WERE GOING AROUND AND I BELIEVE THE TWR AT THE SAME TIME TOLD US TO GAR; BUT HE WAS PARTIALLY BLOCKED. THE ACFT TAKING OFF WAS 1/2 - 1 MI AHEAD AND CLBING UNDER US. I ORDERED A L TURN AND KEPT THE OTHER ACFT VISUAL. I ASKED THE TWR WHAT HDG THEY WANTED AND AGAIN BLOCKED THEIR XMISSION. THE TWR THEN REPEATED 'TURN R TO 050 DEGS; YOU ARE VERY CLOSE TO THE OTHER ACFT.' AT THIS POINT OUR HDG WAS 340 DEGS. WE MAINTAINED VISUAL SEPARATION AND IMMEDIATELY TURNED R TO 050 DEGS. I BELIEVE WE WERE S OF P-56 (OVER THE JEFFERSON MONUMENT) AS WE TURNED; BUT IT WAS CLOSE.