J_2024 05 09_West Orange Stormwater Management Plan

Basic Design Information Northeast Bioretention (BR-01) Hydrology Design Targets 1. The bioretention system is designed as an online system. 2. The design drain time is 30.00 hours. 3. Due to the water-tight retaining walled and clay lined bottom basin the bioretention is located inside, along with underdrains in the gravel layer, the seasonal high-water is not required to have a foot of separation. 4. Due to the water-tight retaining walled and clay lined bottom basin the bioretention is located inside, along with underdrains in the gravel layer, the field soil permeability is not a factor in the design. Hydraulic Design Targets 1. Design parameters Water Quality 2-year 10-year 100-year Design storm storm storm Storm 1.25 inch 3.4 inches 5.2 inches 8.7 inches Rainfall in 2 hours in 24 hours In 24 hours In 24 hours Depth (inches) 0.011 ac-ft 0.043 ac-ft 0.056 ac-ft 0.089 ac-ft Runoff Volume (acft) 0.12 cfs 0.37 cfs 1.52 cfs 2.86 cfs Peak Flow Rate (cfs) 597.68 599.60 600.37 602.39 Water Surface Elevation (feet) Note: The design engineer shall fill out the table in accordance with the design of the stormwater management measure. If the item is not applicable, enter N/A in the table. 2. The emergency spillway is at EL. ______N/A_____ feet (if applicable). Basin Configuration Targets 1. Pretreatment is not provided. A concrete outlet structure is used. 2. Planting Soil Bed o The depth of the soil planting bed is 3.0 feet. April 2015 Bioretention System Page 22/49