photo 1 photo 2 - transportation.alberta.ca landslides... · photo 7 1) backslope ditch subsurface...

GP 3 (Sheet 1 of 3)Hwy. 40:38

Cutbank River (South)

7100131.002 August 2004Regional Geotechnical Assignment

Grande Prairie Area

7100131002Q02c.cdr7100131002Q02c.cdr

Photo 1Photo 1

Note: Photos Taken in June, 2004Note: Photos Taken in June, 2004

1) Some smaller rock on downstream face washed away exposing geotextile fabric2) Need larger size (+ 200 mm size) fractured rock to place over downstream slope face at 3H:1V or flatter

1) Some smaller rock on downstream face washed away exposing geotextile fabric2) Need larger size (+ 200 mm size) fractured rock to place over downstream slope face at 3H:1V or flatter

Photo 3Photo 3

1) Other rock barriers in good working condition1) Other rock barriers in good working condition

Photo 2Photo 2

1) Another rock barrier with washed away rounded rock at downstream face2) Need replacement with fractured rock1) Another rock barrier with washed away rounded rock at downstream face2) Need replacement with fractured rock

7100131.002 August 2004Regional Geotechnical Assignment

Grande Prairie Area

Note: Photos Taken in June, 2004Note: Photos Taken in June, 2004

Photo 6Looking upstream.

Photo 6Looking upstream.

Photo 5Looking downstream from 1st rock barrier.

Photo 5Looking downstream from 1st rock barrier.

GP 3 (Sheet 2 of 3)Hwy. 40:38

Cutbank River (South)

7100131002Q02c.cdr7100131002Q02c.cdr

Photo 4Looking upstream at 1st set of rock barrier.

Photo 4Looking upstream at 1st set of rock barrier.

1) In good working condition1) In good working condition

1) A series of cascade rock barriers2) In good working condition1) A series of cascade rock barriers2) In good working condition

1) Site discussion1) Site discussion

7100131.002 August 2004Regional Geotechnical Assignment

Grande Prairie Area

Note: Photos Taken in June, 2004Note: Photos Taken in June, 2004

Photo 7Photo 7

1) Backslope ditch subsurface drain outlet2) Intercept of groundwater and sub-surface drainage evident at water outflow at outlet of sub-surface drain3) Grass catch successful along ditch to function as effective erosion control measure

1) Backslope ditch subsurface drain outlet2) Intercept of groundwater and sub-surface drainage evident at water outflow at outlet of sub-surface drain3) Grass catch successful along ditch to function as effective erosion control measure

GP 3 (Sheet 3 of 3)Hwy. 40:38

Cutbank River (South)

7100131002Q02b.cdr7100131002Q02b.cdr

Photo 8Photo 8

1) Gabion drop structure functioning well2) Good grass catch along ditch1) Gabion drop structure functioning well2) Good grass catch along ditch