Metropolitan Washington's 60,000 U.S. managers/supervisors, who sometimes must feel like trained seals competing for an inadequate supply of fish, would get a new pay-for-performance deal under a bill Rep. Frank Wolf (R-Va.) will introduce today.

Under the plan, the Grade 13 through 15 types who excel would be guaranteed the regular federal pay raise, be eligible for special bonuses and once again get in-grade (longevity) raises, which they lost under former president Carter's civil service reform act.

So-called GM (for government manager) personnel would go under a five-level annual performance rating system.

Those who got the top two ratings--"outstanding" or "highly successful"--would get the full percentage October pay raise granted rank-and-file civil servants, in-grade raises plus a special monetary "performance award."

The GMs rated "fully satisfactory" would get the full October raise plus any in-grade due them. Those rated "marginally satisfactory" or "unsatisfactory" would get no increase.

Under the current merit pay system--which looks better on paper than in practice--the GMs no longer qualify for in-grade raises. They are guaranteed only half of the regular October percentage pay increase that rank-and-file feds get automatically. Even managers with poor ratings get the same minimum raise.

To get "merit" raises, supervisors/managers now must get top marks from bosses under a rating system that varies from agency to agency. Money to finance any merit raise for them comes from a pool of funds formerly earmarked for raises based on time-in-grade (each worth about 3 percent), which they no longer qualify for.

Since merit pay has been in effect, many GMs say, they have been shortchanged. They say they have received actual percentage raises smaller than subordinates who are not on the merit pay system because the subordinates continue to get automatic in-grades plus the full October white-collar pay adjustment.

Making supervisors/managers eligible once again for the in-grade raises could be especially important this year, because President Reagan has said he intends to skip the regular catch-up-with-industry raise due white collar employes this October.