MSA modeling shows pond and basin problems; staff recommend bioretention conversion and berm repairs
MSA told the Water Resource Management Commission that modeling of the Graveyard/Graber Pond watershed shows flood extents under hundred-year and recent storm scenarios and that Misty Valley infiltration basins are underperforming; MSA recommended converting a north sedimentation basin to bioretention, repairing an eroded berm and installing an adjustable outlet to restore infiltration and pollutant removal.
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MSA consultant Jeff presented modeling and field findings to the Water Resource Management Commission on Feb. 18, saying the existing conditions model shows watershed connections that are increasing flood risk to homes near Graveyard/Graber Pond and that portions of the Misty Valley stormwater system are not achieving their original infiltration targets.
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