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clearly show how to control storm drainage, flood
hazard and erosion, and to protect groundwater,
including:
preserving natural channels to the
maximum extent possible;
utilizing detention or retention ponds and
minimize impervious surface;
establishing interceptor ditches above
steep slopes, where required, in such away
to not saturate soil, and the intercepted
water should be conveyed in a pipe or
other appropriate manner to a municipal
storm sewer system or to the bottom of a
ravine or bluff;
utilizing discharge point stabilization for
natural drainage path; and
providing a controlmechanismtominimize
erosion and siltation.
7. Development proposals shall be accompanied
by a hydro-geotechnical study that identifies the
hazardous nature of the subject area, including:
vegetation types;
ecologically sensitive areas;
view vistas;
soil types;
soil and terrain stability;
rock outcroppings;
specific hazard area; and
protective and mitigating measures to be
used during and after construction and
development.
8. A Professional Engineer with experience
in geotechnical engineering shall submit a
geotechnical study in accordance with the
landslide assessment guidelines published by
APEGBC (Associated Professional Engineers and
Geoscientists of BC) and the City of Chilliwack
Guidelines for Geohazard Assessment and
Investigation.
9. A storm water management plan must be
submitted to the satisfaction of the Director of
Engineering and must provide on-site drainage
so as not to adversely affect adjacent properties.
Further, all post development water flows into
the storm drainage system must not exceed pre-
development flows in accordance with the City of
Chilliwack Policy and Design Criteria Manual for
Surface Water Management.
10. Stream crossings and roadway construction
adjacent to streams shall obtain all necessary
approvals and be designed to accommodate flows
and retain the streambed in a natural condition.
11. A Qualified Professional is required to supervise
all excavations or placement of fill in natural slope
areas
.
12. Road design should minimize the potential danger
of erosion, landslide and flooding. The following
techniques may apply where appropriate:
follow contours;
allow split level, one-way streets;
allowflexibility in the placement of lot lines
to accommodate “traversing driveways”;
and
employ narrow pavement widths, within
the limits of public safety, by the use of
off-street parking in bays and clusters.
13. Hillside and upland development should employ
environmentally sound techniques in engineering
and architecture such as:
grading to complement natural land forms
to minimize terracing (cut and fill);
using indigenous materials in landscaping;
placing, grouping and shaping of man-
made structures to complement the
natural landscape; and
encouraging a variety of building types
clustered to maximize the amount of open
space and natural features.
14. Hillside and upland development should
complement or enhance the aesthetic qualities of
the natural landscape. Where possible, skylines
and ridgetops, and tree and shrub masses should
be preserved, and all man-made structures should
Implementation Guide