(BELOW IS THE DESCRIPTION IN THE 1982 Master Drainage Plan)
Line G begins as a 12 foot wide, 4 foot high reinforced concrete box (RCB) under Canyon Drive, about 300 feet east of Mission Trail. From here, a 4 foot wide trapezoidal channel, 4 feet deep will convey the 270 cfs westerly across Mission Trail to its confluence with Line F. From this point downstream, a combined 100 year flow of 775 cfs will be transported in a 6 foot wide, 5.5 feet deep channel section. Again, this facility will outlet into Lake Elsinore at the 1260 foot elevation.

(THE CURRENT DESCRIPTION OF LINE G FOUND IN 2014-2015 PROJECT NOTES FOR THE 5 YEAR CIP FOR RIVERSIDE COUNTY FLOOD CONTROL)

SEDCO MDP LINE G – Project collects flows from existing I-15 culverts near Cherry Street, then carries them west 5,600 feet in Canyon Drive, then northwest across Mission Trail 3,300 feet to outlet just west of Skylark Airport Road.

The beginning of Line G.

This is where it all begins for Line G. This picture taken on the south side of Canyon Drive. Not sure how this is a box, but?

Passage way for Line G water under Mission Trail.

Not sure how water flowing through a 4 foot high 12 foot wide concrete box is supposed to transition to this and do it well.

Below is as the passageway under Mission Trail exits next to the Mission Trail (Wildomar) Library.

The current channel that flows towards the lake at Elsinore.

BELOW IS A LINK TO THE 5 YEAR CIP PROJECT NOTE FOR RCFC&WCD
http://rivcocob.org/agenda/2014/09_30_14_files/11-02part2.pdf