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

REPORT OF PRELIMINARY GEOTECHNICAL AND STORMWATER BASIN AREA INVESTIGATION, PREPARED BY DYNAMIC EARTH, LLC (ATTACHED SEPARATELY)

DRAINAGE AREA MAPS

1904 Main Street Lake Como, NJ 07719 T: 732.974.0198 F: 732.974.3521 www.dynamicec.com ● PERMITTING ● LAND DEVELOPMENT CONSULTING GEOTECHNICAL ● ENVIRONMENTAL ● SURVEY ● PLANNING & ZONING Offices conveniently located in: Lake Como, New Jersey T: 732.974.0198 | Chester, New Jersey T: 908.879.9229 | Newark, New Jersey T: 973.755.7200 | Toms River, New Jersey T: 732.678.0000 Allen, Texas T: 972.534.2100 | Austin, Texas T:512.646.2646 | Houston, Texas T: 281.789.6400 | Delray Beach, Florida T: 561.921.8570 Newtown, Pennsylvania T: 267.685.0276 | Philadelphia, Pennsylvania T: 215.253.4888 | Bethlehem, Pennsylvania T: 610.598.4400 ROBERT P. FREUDJOHN A. PALUS ã

1904 Main Street Lake Como, NJ 07719 T: 732.974.0198 F: 732.974.3521 www.dynamicec.com ● PERMITTING ● LAND DEVELOPMENT CONSULTING GEOTECHNICAL ● ENVIRONMENTAL ● SURVEY ● PLANNING & ZONING Offices conveniently located in: Lake Como, New Jersey T: 732.974.0198 | Chester, New Jersey T: 908.879.9229 | Newark, New Jersey T: 973.755.7200 | Toms River, New Jersey T: 732.678.0000 Allen, Texas T: 972.534.2100 | Austin, Texas T:512.646.2646 | Houston, Texas T: 281.789.6400 | Delray Beach, Florida T: 561.921.8570 Newtown, Pennsylvania T: 267.685.0276 | Philadelphia, Pennsylvania T: 215.253.4888 | Bethlehem, Pennsylvania T: 610.598.4400 ROBERT P. FREUDJOHN A. PALUS ã