High Water Rainfall Event (May 4 to May 6, 2017)
Conditions Prior to the Weather Event
- Water levels were higher than normal due to the saturated soil conditions and 25-45 mm of rainfall the previous week
- The Surface Water Monitoring Centre advised CAs that there was a large system moving into the area.
- KCCA issued a Watershed Conditions Statement—Flood Outlook on May 3, 2017 at 16:30 EST.
During the Weather Event
- A strong low pressure system with a rich supply of gulf moisture developed in the southern United States and tracked northerly into southern Ontario.
- Early Environment Canada forecast information indicated a potential for rainfall amounts ranging from 40-70 mm over three days.
- Rainfall warning issued for the area on May 3rd at 15:04 EST via the ECAlertMe system.
- Surface Water Monitoring Centre (MNRF) continually updating CAs with new information from the storm tracker.
- Recorded rainfall amounts across the watershed ranged from 44.4 mm to 61.5 mm with highest amounts in Dodd Creek and Upper Kettle Creek subwatersheds.
- Recorded rainfall intensities over the duration of the event were low, ranging from 1 to 3 mm/hr.
- Winds coming off of Lake Erie were not conducive to storm surge conditions over the duration of the event.
Kettle Creek Conservation Authority Actions
- Flood Watch media release issued by KCCA on May 5, 2017 at 10:00 which provided details on the impending rainfall event and information regarding safety and local conditions.
- Continuous monitoring of weather conditions and real-time watershed monitoring of precipitation, water level and flow using the stream gauge and rain gauge network.
- KCCA flood watch team deployed to monitor key areas of historically flood prone locations, as well as continuous monitoring of dams over the duration of the event.
- Ongoing updates to social media of photos, videos to Facebook, Twitter and Instagram.
Dams and Erosion Control Structures
- Continuous monitoring of Dalewood Dam, Union Dam and Southwold Wall.
- Flows observed moving well over the structures with no major debris or blockages.
- Bankful conditions observed in many urban and rural streams.
- Many historically flood prone areas in the Upper Kettle Creek subwatershed exceeded bankful conditions and extended into natural floodplain areas.
- No debris blockages or overtopping of road crossings were observed.
- No flooding of structures were identified through field observations.
- Ponding of water observed in many agricultural fields.