BMP Monitoring Sites - Urban Drainage and Flood Control District

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Orchard Pond EDB – Flow Dissipater and Forebay UDFCD BMP MONITORING SITES Orchard Pond EDB
UDFCD BMP MONITORING SITES Orchard Pond EDB Installation Guidelines Basin Storage Volume Provide a storage volume equal to 120% of the WQCV based on a 40-hour drain time, above the lowest outlet (i.e. perforation) in the basin. The additional 20 percent of storage volume provides for sediment accumulation and the resultant loss in storage volume. A. Determine the WQCV tributary catchment’s percent imperviousness. Account for the effects of DCIA, if any, on Effective Imperviousness. Using runoff volume reduction practices in the tributary catchment, determine the reduction in impervious area to use with WQCV calculations. B. Find the required storage volume (watershed inches of runoff): Determine the Required WQCV (watershed inches of runoff) based on a 40-hour drain time. Calculate the Design Volume in acre-feet as follows: ⎛WQCV ⎞ DesignVolu me = ⎜ ⎟ * Area ⎝ 12 ⎠ In which: Area = Area tributary to the sand filter 1.2 factor = Multiplier of 1.2 to account for the additional 20% or required storage for sediment accumulation Outlet Works The outlet works are to be designed to release the WQCV (not the Design Volume) over a 40-hour period. Refer to the Manual for schematics pertaining to structure geometry; grates, trash racks and screens; outlet type (orifice plate or perforated riser pipe); cutoff collar size and location; and all other necessary components.
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BMP Monitoring Sites - Urban Drainage and Flood Control District

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