Hamelin Creek (Upstream Stretch) Culvert Inlet …Photo 1a Photo 1 Looking South (towards Hwy 49) at upstream portion of this creek. The view is from north valley slope - Two watercourses

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2008-1002C August 2008SH 725

Hamelin Creek Slide

File No: 2008-1002Ca12cFile No: 2008-1002Ca12c

Note: Photos taken on June 2008Note: Photos taken on June 2008

Photo 1a

Photo 1Looking South (towards Hwy 49) at upstream portion of this creek. The view is from north valley slope - Two watercourses flowing from upstream (Hamelin Creek from right of photo)(Tributary Creek) at centre of photo) to confluence at inlet of the arch culvert- Creek flows from right to left of photo- Settlement of fill embankment at culvert crossing location. Sagging of guardrail

Looking South (towards Hwy 49) from north valley slope- Close-up view of roadway settlement caused by lateral spreading and internal settlement of fill- Lateral movement of guardrail indicative of lateral spreading movement of fill

Culvert InletCulvert Inlet

Hamelin Creek (Upstream Stretch)Hamelin Creek (Upstream Stretch)

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Hamelin Creek Slide



Photo 2a

Photo 2

Photo 2b

Looking South (towards Hwy 49)- Another close-up view of roadway settlement

Looking South (towards Hwy 49)- Tension cracking of pavement at south edge of fill approach juncture- Indicative of lateral spreading movement of fill in addition to settlement

- Transverse cracking of pavement at edge of fill approach juncture

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Hamelin Creek Slide



Photo 3a

Photo 3

Photo 3b

Looking north towards highway and towards upstream of Hamelin Creek - Tributary creek flowing (from left bottom of photo) to confluence with Hamelin Creek to flow (turn 90 degree) to flow (left to right) into the arch culvert - Toe slide (under-scour fill by tributary creek) behind headwall at culvert inlet- Slumping side at NW corner of approach fill

Looking north towards highway from culvert inlet area - Slumping side at NW corner of approach fill

Slumping side at NW corner of approach fill- Closed-up view

NW SlumpNW SlumpNW SlumpNW Slump

Hamelin CreekHamelin Creek

u arye

Tribt

Crek

u arye

Tribt

Crek

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Hamelin Creek Slide



Photo 4a

Photo 3

Photo 4cPhoto 4b

Looking at curvature inlet of culvert from upstream bank of Hamelin Creek0- Hamelin Creek (bottom right of photo) flow to enter culvert through a 90 turn

- Erosion of bank at upstream area and sliding of bank slope adjacent to riprap area. The bank sliding area require riprap protection. The bank area to be considered for riprap

nd protection may extend to past the 2 bend from the existent riprap section.

Looking towards inlet of culvert from upstream bank- From further upstream- Natural channel at about 80 m-100 m upstream for inlet

Looking towards inlet of culvert from upstream bank- From a further upstream- Bouldery gravel channel bedding indicative of more flow energy for stone transport and more vigorous channel degradation process

- From a more further upstream- Small size gravel channel bedding indicative of less flow energy for stone transport and less vigorous channel degradation process

kBan SlumpingkBan Slumping

Ba k Slump ng needs

niiprap Protection

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Ba k Slump ng needs

niiprap Protection

R

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Hamelin Creek Slide



Photo 5b

Photo 5

Photo 5c

Photo 5aLooking upstream of Hamelin Creek from inlet of culvert

0- Hamelin Creek (left of photo) flow to enter culvert (right of photo) through a 90 turn- Scour bank of fill slope (just upstream of riprap bank adjacent to inlet)- A meander bend of channel bank at far end of photo

Looking upstream of Hamelinst- A 1 meander bend of channel at far end of photo

- It maybe advisable to install riprap for erosion protection to cover this meander bend of channel

Looking upstream of Hamelinst- Towards further upstream beyond the 1 meander bend

- Natural channel bedding

Looking upstream of Hamelin- Towards a further upstream- Natural channel bedding

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Hamelin Creek Slide



Photo 6b

Photo 6

Photo 7

Photo 6aLooking at culvert inlet from Tributary Creek- Slumping of natural slope bank opposite to culvert inlet

Looking upstream at Tributary Creek- Riprap lining of channel has shifted and channel has eroded into nature soil at far bank of natural slope- Culvert wingwall at left of photo

Looking upstream at Tributary Creek- Riprap lining of channel has shifted and channel has eroded into nature soil at far bank of natural slope- Culvert wingwall at left of photo- This vertical degradation may be causal to sliding at back of curvature wingwall at culvert entrance

Looking downstream into culvert- Water level inside culvert was apparently higher from last annual inspection. Obviously, siltation buildup from culvert floor has raised water level inside culvert

Hamelin CreekHamelin Creek

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Hamelin Creek Slide



Photo 8

Photo 9

Looking north at Culvert inlet- Slide at back of wingwall at entry of Tributary Creekt

Looking from roadway at downstream channel of culvert exit - A straight reconstructed channel- A bank slide at north side (left of photo) apparently caused by ditch water outfall from a stilling basin at top of bank

e

Tributary Creke

Tributary Crek

SlideSlide

Slide at Bank ofHead Wall

Slide at Bank ofHead Wall

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Photo 11a Photo 11b

Photo 10 Photo 11Looking north from centre of fill just above culvert location - Slight slanting of pavement toward south (downstream) (right of photo). Apparently, there is more settlement and/or lateral spreading toward downstream- Dipping of pavement toward south (downstream) (right of photo) at patched area is apparent at centre area of fill

Looking south from centre of fill just above culvert location- Two back slope slides at culslopes at far end of roadway (just beyond and into photo)- Dipping of pavement toward south (downstream) (left of photo) at patched area is apparent at centre area of fill

South approach at top of valley slope- Backslope slide at south side

Backslope slide at south side- Backslope slide at north side

SagSag

Documents

Hamelin Creek (Upstream Stretch) Culvert Inlet …Photo 1a Photo 1 Looking South (towards Hwy 49) at upstream portion of this creek. The view is from north valley slope - Two watercourses