Stormwater Network
The County maintains a diverse stormwater network to protect County residents and businesses, along with our natural and built environments. The County is responsible for all stormwater assets within a County right of way. Due to the interconnected nature of stormwater assets throughout the County, analysis on stormwater flows is completed holistically.
The County’s stormwater network is categorized into various components, as a result of differing life spans and maintenance strategies. They are stormwater treatment facilities, culverts with a diameter below 3 meters, catchbasins, catchbasin leads, storm mains and laterals.
Inventory
As staff continue to work on reducing data gaps, road reconstruction dates have been utilized as an estimate for the age of the stormwater assets associated with each road section, where an in-service date is not available. Current inventories have been adjusted as some assets previously classified as culverts have been updated to storm mains where it was determined they had a structure at one or both ends.
The replacement cost valuation for the assets in our stormwater network are based on current tender prices, where available. The replacement values assume that work is completed in conjunction with other lifecycle projects, such as road rehabilitation and linear water and wastewater asset replacement.
| Asset Component | Unit | Current Inventory | Replacement Cost |
| Stormwater Treatment Facility | bldg | N/A | $665,791 |
| Catchbasins | each | 3,233 | 19,024,149 |
| Catchbasin Lead | length (m) |
17,120 |
9,825,655 |
| Culverts <3m | length (m) | 65,719 | 67,772,043 |
| Storm Lateral | length (m) | 642 | 464,133 |
| Storm Main | length (m) | 84,317 | 75,880,349 |
| Total Replacement Cost | $173,632,119 | ||
Condition
The percentage of assets in poor or critical condition has remained unchanged at 12% as reported in the 2024 AMP. The percentage of assets in good or excellent condition has decreased from 61% as reported in the 2024 AMP to 59%.
Key Performance
Stormwater assets help to reduce flooding risks and protects roads, structures, properties, and waterways. The County’s stormwater network works in combination with local area municipality stormwater networks, where these systems may be co-dependent on one another to provide an outlet for each other.
| Key Service Attribute | LOS Statement | Performance Measure | 2022 | 2023 | 2024 |
| Safety | Providing a safe stormwater network which mitigates the impacts of property damage during stormwater events | % of properties in municipality resilient to a 100-year storm | 98% | 98% | 98% |
| % of the municipal stormwater management system resilient to a 5-year storm (urban areas and settlement villages) | 90% | 90% | 92% |
Proposed Levels of Service Review
An informative analysis of different proposed service levels cannot be completed at this stage due to the data gaps that exist. The County is currently funding its stormwater lifecycle needs more than what the asset management system indicates the long-term need is due to the data gap.
Funding Gap Analysis
This portfolio is currently funded through an annual levy contribution to the Stormwater reserve, and use of Ontario Community Infrastructure Funding (OCIF). While the data continues to mature for this service area AMP, staff will evaluate needs and funding sources (including annual contribution from the levy to the Stormwater reserve and OCIF allocation) as part of each business plan and budget cycle.