Drainage Report

SZ r : wNTECH Cascade Design Summary ENGINEERED SOLUTIONS West Essex Highlands West Orange, NJ 10/19/2023 Information provided by Engineer (Anderson Consulting): ° Water Quality Flowrate = See Table ° 100-YR Peak Flowrate = See Table ° Presiding Agency = NJDEP ° TSS Removal Required = 50% Sizing Summary: The Cascade Separator is a hydrodynamic separator designed to protect waterways from stormwater runoff. The Cascade Separator is commonly used as a standalone stormwater quality control practice that provides pretreatment to detention, infiltration, bioretention, and rainwater harvesting systems. This innovative treatment product excels at sediment capture and retention while also removing hydrocarbons, trash, and debris from the stormwater runoff. The Cascade Separator is NJCAT verified and as a result has received final certification from the NJDEP for 50% TSS removal. Site Designation Water Quality 100-YR Peak NJDEP Approved Cascade Flow Rate (cfs) Flow Rate (cfs) Flow Rate (cfs) Model WQU-2.2 2.26 15.95 2.81 Ccs-5 WQU-2.3 2.98 24.53 4.05 CS-6 WQU-2.4 1.89 23.31 2.81 CS-5 WQU-2.5 4.25 19.73 7.20 CS-8 WQU-2.6 4.74 22.02 7.20 CS-8 WQU-3.0 2.00 22.64 2.81 CS-5 WQU-5.1 1.24 10.51 1.80 cs-4 WQU-5.2 3.34 16.43 4.05 CS-6 Maintenance: Like any stormwater best management practice, the Cascade Separator requires regular inspection and maintenance to ensure optimal performance. Maintenance frequency will be driven by site conditions. Bi- annual visual inspections are recommended, at which time the accumulation of pollutants can be determined. On average, the Cascade Separator requires annual removal of accumulated pollutants. Thank you for the opportunity to present this information to you and your client. Dixon J. Wiley CASCADE Stormwater Design Engineer separator® Contech Engineered Solutions LLC Page 1