Report 4 13 2026

​ENSURPLAN, INC.​ ​ ww.Ensurplan.​​net​ w ​ ivil Engineers & Land Surveyors C Ph: (732) 469-0400​ ​Certificate of Authorization 24GA27997700​ ​STORMWATER DRAINAGE REPORT​ ​04/13/26​ ​Minor Subdivision 15 Ridgeway Ave West Orange, NJ​ ​Design Methodology/Discussion​​(continued)​ ​Projected Intensity Storm​ ​Pre Construction Rate​ ​Maximum​ ​Post Construction Rate​ ​2 Year Storm 0.57 cfs 0.29 cfs 0.26 cfs​ ​10 Year Storm 1.31 cfs 0.98 cfs 0.90 cfs​ ​100 Year Storm 3.17 cfs 2.54 cfs 2.33 cfs​ ​Stormwater Recharge​ ​Requirements​ ​ o comply with the Major Stormwater regulations recharge requirements, stormwater​ T ​management measures shall be designed to demonstrate through hydrologic and hydraulic​ ​analysis that the increase of stormwater runoff volume from pre-construction to​ ​post-construction for the projected two-year storm, as defined and determined pursuant to​ ​N.J.A.C. 7:8- 5.7(d), is infiltrated.​ ​Design Methodology/Discussion​ ​ echarge has been provided by the use of a small scale infiltration basin and has been​ R ​analyzed by utilizing the New Jersey Groundwater Recharge Spreadsheet (NJGRS)​ ​ s the NJGRS cannot model infiltration from a system which is simultaneously discharging​ A ​outflow through an orifice the study area is limited to a 2” thick stone bed set below the system​ ​outlet.The BMP variable is the depth from the surface invert of the discharge orifice or 48”. The​ ​depth to the lower surface is 50” and the effective depth of the BMP is 1.6” or 0.4 voids x 2”​ ​stone depth.​ ​9​ ​Mailing Address: Post Office

​stone depth.​ ​9​ ​Mailing Address: Post Office Box 4304, Warren, NJ 07059​