2026 05 Storm Water Management Report rcd 5 6 2026

Bioretention Basin Drain time Calculations Project: Proposed Mavis Tire Supply Computed By: AJH Job #: 1956-24-04187 Checked By: Location: West Orange, New Jersey Date: 4/28/2026 Revised: Basin Name: Bioretention Basin with Underdrains Volume of Runoff Below First Orifice = 372 cubic feet Surface Area of Bioretention Basin Soil Bed = 323 square feet Effective Depth of Runoff to be Infiltrated = Volume of Runoff Below First Orifice / Surface Area of Soil Bed = 1.15 feet = 13.82 inches Permeability Rate of Soil Bed = 1 inches per hour Design Recharge Rate * = 0.5 inches per hour Effective Depth of Runoff to be Infiltrated / Design Recharge Rate = Time to Empty Basin = 27.64 hours** *Note : Factor of Safety of 2 is applied to the Field Tested Recharge Rate to establish the Design Recharge Rate **Note : Time to Empty Basin must be less than 72 hours. Therefore; Drain time is less than 72 Hours, therefore, design is acceptable