LOGICAL useStevensWest
& useStevensEast,useStevensWest,
IF ( useStevensWest ) THEN
& useStevensEast.OR.useStevensWest) THEN
IF ( tileHasOBW(bi,bj) .AND. useStevensWest ) THEN
& .OR. ( useStevensWest.AND.useOrlanskiWest ) ) THEN
useStevensWest =.FALSE.
& .OR. useStevensEast .OR. useStevensWest )