Policy Approaches for Natural Hazards
POLICY APPROACHES FOR NATURAL HAZARDS (Provincial Policy Statement, 3.1)
Three portions of the "areas of Provincial Interest" have been identified as having unacceptable risks to life and property, and development is not permitted. They are:
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defined portions of the dynamic beach
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defined portions of the one hundred year flood level along connecting channels
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a floodway
Development and site alteration may be considered in the remaining portions, provided that all of the following can be achieved:
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The hazards can be safely addressed
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Development and site alteration is carried out in accordance with established standards and procedures, including floodproofing, protection works, and access
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New hazards are not created and existing hazards are not aggravated
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No adverse environmental effects will result
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Vehicles and people have a way of safely entering and exiting the area during times of flooding, erosion and other emergencies
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Development does not include institutional uses or essential emergency services or the disposal, manufacture, treatment or storage of hazardous substances
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The interest and intent of other laws and policies addressing the same area are not compromised (fish habitat, wetlands…) which may not consider development within these areas to be appropriate or acceptable
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AREA OF PROVINCIAL INTEREST
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POLICY APPROACH
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NVCA WATERSHED
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| Hazardous Lands: Great Lakes - St. Lawrence River System Large Inland Lakes |
The area of provincial interest is based on the furthest landward limit of: a) flooding hazards involving the combined influence of lake levels (100-year level), PLUS a flood allowance involving wave uprush and other water related hazards. (15m on the Great Lakes) b) dynamic beach hazards involving the combined influence of (a) PLUS a dynamic beach allowance. (30m on the Great Lakes, or 10m on large inland lakes) c) erosion hazards involving the combined influence of (two step process) Step 1: Select one of a stable slope (3:1) PLUS recession rate allowance; OR Stable slope (3:1) PLUS erosion allowance (30m on the Great Lakes) Step 2: Whichever is the greater of step 1, OR an erosion allowance measured from the first lakeward break in slope |
100-Year peak instantaneous water level is 178.0 meters (G.S.C.D.) Wave uprush is 15m or an elevation of 178.3 meters Dynamic beach allowance is 30m Stable slope (3:1) and site specific inspection In general, recession rate information is not available Erosion allowance is 30m |
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Hazardous Lands:
River and Stream Systems |
The area of provincial interest is based on the furthest landward limit of:
a) flooding hazards, greater of the 100 year flood event, storm centered event, or observed flood event b) erosion hazards Confined systems and terrain-dependant systems (consisting of cohesive materials) involving the combined influence of a toe erosion allowance OR 100 times the annual recession rate PLUS a stable slope allowance (3:1) PLUS an erosion access allowance (6m) Unconfined systems and terrain-dependant systems (consisting of cohesionless materials) involving the combined influence of the flooding hazard limit OR meander belt allowance, PLUS |
Greater of the Timmins Storm (1961) or 100-year flood
In general, annual recession rate information is not available Stable slope (3:1) and site specific inspection Erosion access allowance is 6m Meander belt allowance is site specific Toe Erosion allowance is 100-year design based on 25 years of data on annual recession rates, or generally 15m from the toe of the waterway or base of the valley wall. Toe erosion is site specific. |
| Hazardous Sites Unstable soils |
An area of provincial interest based on studies using accepted geotechnical and engineering principles and practices addressing toe erosion, slope stability, soil structure and bedrock material | Site specific |