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 D 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) 0.07) 0.11 0.18) Area of Flow (A) (sf)* 0.70) 4.14 1,83} Velocity (V)=Q/A (ft/sec) 0.62 0.85 4.14 #&V = < 2.0FPS & Stability Achieved