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DeKalb commissioners hear Snap Finger watershed inspection findings; Arcadis recommends targeted rehab and pond decommissioning pilots
Summary
Arcadis briefed DeKalb County commissioners on a Snap Finger Creek watershed master-plan update, reporting targeted inspections of ~1,100 critical assets, new drone/LIDAR inspection technology and a recommendation that roughly 64 of ~218 detention ponds be considered for decommissioning or repurposing; staff flagged pilot bio-retention work and a $1 million ballpark cost per subsequent watershed study group.
DeKalb County commissioners on Tuesday received an in-depth update on the Snap Finger Creek watershed from Arcadis, the county's engineering consultant, who described field inspections, condition findings and early recommendations for detention-pond decommissioning and targeted rehabilitation.
"We're doing pole camera inspections" and deploying a small, caged drone that captures high-definition video plus LIDAR and thermal data to build a digital profile of culverts and pipes, Arcadis presenter Rich Bruel said. The team has mapped roughly 11,000 stormwater assets in the Snap Finger watershed, prioritized about 1,100 as highest-consequence for failure and is inspecting that subset in the field.
Bruel said inspectors have focused on the highest-risk classes of pipes — those beneath single ingress/egress roads and major collectors — and that the early field work has shown a nontrivial number of assets in poor or inoperable condition. "Of the higher-consequence assets we've looked at so far, about 10% are in very poor or inoperable condition," he said, urging…
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