Protecting People and Property

South Nation Conservation (SNC) invites watershed residents living along South Castor River within the City of Ottawa and the United Counties of Stormont Dundas and Glengarry (SDG), to view draft floodplain mapping (or natural hazard maps). 

These natural hazard maps have been developed on behalf of the City of Ottawa and SDG and will be used when updating Official Plans and zoning schedules, and when reviewing development applications to protect people and property from natural hazards and guide sustainable development activities.

Regulation areas included on draft maps include the greatest of whichever natural hazard is present: floodplain or riverine erosion. It's important to speak with the Conservation Authority when considering developing in these areas to determine what type of hazard or constraint may exist. 

Development projects within natural hazard areas (like floodplains) require permission from the Conservation Authority before proceeding. Please visit SNC's Regulations Webpage to learn more about regulations made under the Conservation Authorities Act O.Reg 41/24 Prohibited Activities, Exemptions and Permits

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Public Consultations

When updating natural hazard maps after completing a comprehensive study, Conservation Authorities will invite affected property owners to review draft maps and provide any comments during public consultations.

Consultations help update Regulation Areas where permission (through a permit) may be required for certain construction or shoreline development activities. Please note that these consultations do not replace any municipal requirements or public notices to update policies or zoning schedules

Residents and stakeholders with properties along South Castor River within the City of Ottawa and Counties of SDG are welcome to book a 1-on-1 meeting with SNC staff to learn more about the floodplain mapping project. 

  Click HERE to access the Frequently Asked Questions

Additional Resources

• What is a Floodplain?
• Permitting in Protected Areas
  
  

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Join us!

Residents are invited to drop by the Open House or schedule a meeting at the SNC Office to meet with staff on the following dates:

Open House
Tuesday, November 17, 2026
6:00 pm to 8:00 pm
Vernon Recreation Centre - Hall. (7950 Lawrence Street, Vernon, ONThis link opens in a new window)
(Drop-in any time between 6pm and 8pm)

1-on-1 Meeting with SNC Staff
Thursday, November 19, 2026
9:00am to 4:00pm
SNC Administrative Office (38 Victoria Street, Finch, ON)This link opens in a new window 
(Schedule your meeting here: 1-on-1 Meeting Request FormThis link opens in a new window)

Can't make it to the Open House on November 17?  
Residents who wish to learn more can schedule a phone, virtual or in-person meeting with SNC on weekdays between November 18 and December 4.

Schedule your meeting with SNC by completing the online Meeting Request Form here:
PUBLIC CONSULTATIONS: Natural Hazards Mapping:  1-on-1 Meeting Request   – Fill out form

Maps

Final natural hazard mapping reports are added to SNC's website and the updated maps are added to SNC's public Geoportal.

The maps of South Castor River are not yet approved by SNC's Board of Directors and remain in draft form until after the public consultation period.

Please note that the "Regulation Area" is displayed on draft mapping. This area includes the greatest of either hazard: 1:100 year floodplain or riverine erosion hazard, plus a buffer. Examples will be shared during consultation meetings. 

CLICK HERE to access the South Castor DRAFT Regulated Area Public Viewer in a new window.

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  Download a PDF version here: South Castor River Draft Reg Keymap

To view an individual floodplain map, find the numbered section on the Key Map above and click the corresponding numbered link below:

MAP 1

MAP 11

MAP 21

MAP 31

MAP 41

MAP 51

MAP 2

MAP 12

MAP 22

MAP 32

MAP 42

MAP 52

MAP 3

MAP 13

MAP 23

MAP 33

MAP 43

MAP 53

MAP 4

MAP 14

MAP 24

MAP 34

MAP 44

MAP 54

MAP 5

MAP 15

MAP 25

MAP 35

MAP 45

MAP 55

MAP 6

MAP 16

MAP 26

MAP 36

MAP 46

MAP 56

MAP 7

MAP 17

MAP 27

MAP 37

MAP 47

MAP 8

MAP 18

MAP 28

MAP 38

MAP 48

MAP 9

MAP 19

MAP 29

MAP 39

MAP 49

MAP 10

MAP 20

MAP 30

MAP 40

MAP 50

South Nation Conservation (SNC), together with local municipalities, will begin the South Nation River Natural Hazard Study to better understand flooding and other natural hazards along the South Nation River and nearby watercourses.

The study will help identify areas that may be vulnerable to flooding and support improved flood mapping, emergency planning, and the protection of homes, infrastructure, and communities.

 

 

Field Survey Work

As part of the study, SNC staff will be conducting field surveys in fall 2026. Staff will collect information to determine:

• River and stream channel depths and widths
• Bridge and culvert dimensions
  
  

Staff will generally access watercourses from public road allowances wherever possible. Where access to private property is required, staff may need to walk and work within the river or stream corridor. Property visits are expected to take approximately 30 minutes.

 

 

Property Access Permission

If your property is identified as requiring access for field work, SNC is requesting your permission to enter the property to complete the survey.

Your cooperation will help us develop a more complete understanding of flood risk in the community and support more accurate natural hazard mapping and emergency planning.

 

Study Area

The South Nation River Natural Hazard Study covers the South Nation River and nearby watercourses within the study area, including the North Branch of the South Nation River.

Map - South Nation River Natural Hazard Study Area

 

Please provide your property access permission online:

Click here   Surveying Near Your Property - South Nation Conservation Natural Hazard Study – Fill out form

 

Questions?

For questions about the study, field work, or to provide permission to access your property, please contact:

South Nation Conservation
Phillip Dagenais, Water Resources Specialist
Phone: 1-877-984-2948
Email: pdagenais@nation.on.ca

Thank you for your time and cooperation as we work to improve our understanding of natural hazards and flood risk across the South Nation River watershed.