2022 08 Drainage Report

q DYNAMIC ENGINEERING Overflow Spillway Calculations Project: Residential Subdivision Job #: 4266-99-001 Location: West Orange Township Computed By: RMW Checked By: RPF Date: 8/5/2022 BIORETENTION BASIN B. To Size Spillway: . Assume complete blockage of the outlet control structure and no infiltration . Route 2 ,10 & 100 year storm through basin assuming that the basin is filled with water up to the Emergency Spillway Elevation 2 Year 10 Year 100 Year Spillway Width (ft. ‘Spillway Elevation (ft, Flow through Spillway (Q) (cfs. Water Surface Elevation (ft) Depth of Flow (ft) 0.14 0.18 0.29] ‘Area of Flow (A) (sf)" 4.14 4.83] 2.98) Velocity (V)=Q/A (ft/sec) 0.82 1.05 1.38 #&V = < 2.0FPS & Stability Achieved