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DeKalb committee hears Arcadis master plan: inventory, risk scoring and pond review; committee defers vote
Summary
County staff and Arcadis presented a countywide stormwater master plan that inventories assets, scores pipe risk (highlighting corrugated metal pipes) and flags hundreds of detention ponds for further study. Commissioners deferred final action for two weeks to allow watershed-level project prioritization and funding analysis.
DeKalb County received a detailed briefing on a draft stormwater master plan, including an inventory of assets, a risk-based prioritization methodology and early results from watershed-level assessments such as Snap Finger Creek. Commissioners asked for more granular cost estimates and prioritized capital projects and voted to hold the master-plan item in committee for two weeks.
Arcadis consultant Rich Grewell and county staff described a county inventory of roughly 52,000 stormwater pipe segments (about 700 miles of pipe), tens of thousands of inlets and approximately 1,000 detention ponds. Grewell said the team applied a risk score combining probability of failure and consequence of failure to prioritize assets. "As we move higher probability failure and higher consequence failure, those are the ones we really want to get ahead of the curve on," Grewell said, summarizing the approach.
The presentation highlighted corrugated metal pipe as a major source of long-term risk.…
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