CYYZ Climb Gradients

[ezconfused]

Anyone know when/why the Pearson clb gradients increased so drastically? ATC only? The numbers don't make sense. The East runways used to be a benign climb to 1100 now they're 400'/NM to 2700.

V0042/19 NOTAMN
Q) CZYZ/QPICH/I/BO/A/000/999/4340N07937W005 A) CYYZ B) 1901141729 C) 1903310500
E) [US DOD PROCEDURAL NOTAM] IFR TAKE-OFF MINIMUMS AND (OBSTACLE)
DEPARTURE PROCEDURES CHANGED C. RWY 05: ADD “REQUIRES A MINIMUM
CLIMB GRADIENT OF 360 FT/NM TO 2700OR SPECIFIED TAKE-OFF MINIMUM
VISIBILITY (SPEC VIS) CORRESPONDING TO AIRCRAFT CATEGORY AS
FOLLOWS: 1 SM (CAT A); 1 1/2 SM (CAT B); 2 SM (CAT C/D) IN VISUAL
CONDITIONS .” RWY 15L: ADD “REQUIRES A MINIMUM CLIMB GRADIENT OF
390 FT/NM TO 3000 OR SPECIFIED TAKE-OFF MINIMUM VISIBILITY (SPEC
VIS) CORRESPONDING TO AIRCRAFT CATEGORY AS FOLLOWS: 1 SM (CAT A); 1
1/2 SM (CAT B); 2 SM (CAT C/D) IN VISUAL CONDITIONS .” RWY 15R: ADD
“REQUIRES A MINIMUM CLIMB GRADIENT OF 380 FT/NM TO 3000 OR
SPECIFIED TAKE-OFF MINIMUM VISIBILITY (SPEC VIS) CORRESPONDING TO
AIRCRAFT CATEGORY AS FOLLOWS: 1 SM (CAT A); 1 1/2 SM (CAT B); 2 SM
(CAT C/D) IN VISUAL CONDITIONS .” RWY 33R: ADD “CLIMB TO 2100 ON
HEADING 327° BEFORE PROCEEDING ON COURSE.” DELETE, “RWY 06L, 06R,
33L: SPECIFIED TAKE-OFF MINIMUM VISIBILITY TO CLIMB VISUAL OVER THE
AIRPORT TO 1500 BEFORE PROCEEDING ON COURSE.”
CREATED: 14 Jan 2019 17:29:00
SOURCE: KACCWonder