_ENFORCEMENT - C1981017 ‎(9)‎

• Permit No: C1981017
• IBM Index Class Name: Enforcement
• Doc Name: Bid Documents ‎(IMP)‎ CV-91-023
• Violation No.: C-91-023
• Media Type: D
• Archive: No

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For light use roads , or reclaimed road surfaces , install waterbars
to direct ditch and road surface drainage off site at frequent
intervals . Such waterbars should not be utilized on unstable fills
or poorly vegetated downslopes where excessive erosion would be
like to occur.
It is recommended that certain road segments be selected for
"demonstration projects" prior to full scale implementation of the
rolling dip/waterbar concept. This should be done this fall if
possible , but would require agreement of USES, MLRD, Operator, and
OSM.
Problem: Erosion on natural ground below culvert outlet or ditch relief down
drain (see NOV C-91-016) :
Contributing factors :
Excessive flow concentration
- Steep slopes , erosive soils
Possible approaches :
Ditch relief waterbars , additional culverts and/or rolling dips in
appropriate locations .
Construction of "keyed in" log check dam structures in series in
gullies .
In most cases , offsite erosion is in steep , forested terrain where
equipment access would necessitate significant additional
disturbance . Thus , the recommended approach to stabilization of
such gullies is to reduce the flow concentration, where possible,
and install check dam structures in series within eroded segments
to slow velocities and allow the gullies to silt in and stabilize .
Such check structures would need to be constructed by hand using
timber available on site .
Problem: Drainage related erosion of road surfaces or fill slopes (see
NOV-C-91 -017)
Contributing factors :
- Excessive road surface width
- Improper ditch and culvert maintenance
- Lack of drainage ditch due to rock outcrop
- Road surface outsloped , combined with no drainage ditch or
improperly maintained drainage ditch .
Possible Approaches :
Road width should be appropriate for the intended use . If future
use is light use only, earthwork necessary to reduce width, as
appropriate , should be performed with road surface sloped to the